Re: [Emc-users] VFD's and Modbus
On 03/08/2011 01:28 PM, Kirk Wallace wrote: On Tue, 2011-03-08 at 05:56 -0500, Mark Wendt wrote: ... snip see things in a certain order or configuration. All the rows of LED lights/radio buttons after row 100 have the ON radio button on top of the OFF radio button, which is typically how we as humans think about light switches - UP is ON, DOWN is OFF. Your very first row, row 100 has the OFF on top and the ON below it. When you scan the page, typically your mind's eye would expect to see ON above the OFF, and when your mind's eye sees the OFF button activated, and it's on top, your scan could translate to having the correct, or incorrect radio button selected. ... snip Yes, I agree. Even though pyVCP was a big advancement when it was introduced (thank you devs), it is limited in being able to configure the components. I went through a few different designs (hours and hours worth), starting with what I wanted, testing, then fixing. I pared it down to what you see now. The first primary issue was that I wanted to read the registers and set the switches to match. Usually one would have a configuration that mostly worked, but needed one or two changes. Flipping a couple of switches and saving seems safe and convenient, but none of the pyVCP output components can be set other than by the user clicking on it. So I then decided to try configuring the switches so that the default option matched the factor default. For the radio button, the top button is the starting setting, so I put the factory setting there. Basically, I wanted something that I could actually use without too much fuss and not have to scan every setting to make sure I don't brick the ModIO when I click Write to ModIO. In the long run, I will need to either create my own pyVCP components or wait for GLadeVCP to see if it is more flexible. For what it's worth, I still think it's pretty cool! Thanks again for the hard work bringing it forward. Mark -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On 9 March 2011 02:54, Clint Washburn cl...@clintandheidi.com wrote: What would be the best way to get the voltage up to 400v DC? You can use a voltage doubler. I have a 700VDC PSU I made which I was going to make an Arduino-controlled VFD out of. But then I got scared, and bought one instead. The circuit is the Delon topology here: http://en.wikipedia.org/wiki/Voltage_doubler but connected directly across 230V single phase mains. I imagine this is what the voltage-increasing single-to-three-phase inverters do. -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
I would recommend against putting 240 VAC into a transformer winding originally designed for 120 VAC. While it would seem that a transformer is a simple ratio device, this assumption falls apart if the iron core cannot support the resulting magnetic flux density. Too little iron and it will saturate. When this happens the winding begins to approximate a very small resistance, almost a short circuit. Using a transformer for voltages lower than rated is generally OK as is running them in reverse. The ratio may prove to be slightly off because the manufacturer may have adjusted the stated ratio to compensate for the losses in the windings but this is typically only a few percent. Steve Stallings -Original Message- From: Kirk Wallace [mailto:kwall...@wallacecompany.com] Sent: Wednesday, March 09, 2011 2:21 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Single Phase Lathe spindle motor question On Tue, 2011-03-08 at 18:52 -0800, Clint Washburn wrote: Are there any VFD's you recommend that would support such a motor? -Original Message- From: Kirk Wallace [mailto:kwall...@wallacecompany.com] Sent: Tuesday, March 08, 2011 12:00 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Single Phase Lathe spindle motor question On Mon, 2011-03-07 at 22:03 -0800, Clint Washburn wrote: I am in the process of converting my 1978 Hitachi Seiki CNC lathe to EMC. It currently has a 7.5 KW dc motor that used to be powered by FUJI SCR ... snip It might be hard to find a VFD rated higher than a few HP that can run on 240VAC input. http://www.automationdirect.com/adc/Overview/Catalog/Drives/GS 2_%28115_-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control%29 Short URL: http://alturl.com/qhdpo The higher HP drives seem to need 460VAC. I bought a VFD from eBay and forgot to check the input voltage. It turned out to be a 460VAC unit. I have a left over 240 to 120 transformer that I now have 240 feeding the 120 end, and get 480 out the other. The VFD works fine on this, but the transformer is quite a bit bigger and heavier than the VFD. My guess is that if you scan eBay for a 10 HP VFD that you will only find units that need 460VAC. A transformer could fix this, but it would need to be big and probably expensive. 10 HP would need around 35Amps at 240 so keep this in mind too. I suppose a 40Amp dryer outlet would work. You will most likely need a mains filter too. I kind of like Jon's idea of trying to keep the DC motor. I was thinking a golf cart driver might work, but I think the output voltage will be too low. Maybe an EV controller? http://www.evsource.com/tls_controllers.php These seem too expensive though. Maybe AC is the way to go. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
For what it's worth, I have a lathe with a 7.5HP motor and used a 10HP Hitachi VFD like this: http://www.driveswarehouse.com/Drives/AC+Drives/Variable+Torque+VFD/X200-075LFU.html?osCsid=04e47b5d74f9275e98232b165be36c89 The Hitachi website gives directions on using the larger drives with single phase input. You are supposed to upsize the drive by 1.732 but I went with 10HP because I figured it would do what I needed, drives are generally rated for 1.5 X rated for a limited time. The weak link is the input rectifiers, you have to get all the amps in through single phase, that's where the 1.732 comes from. So far I haven't been able to push it hard enough to have any problems. One time I let the lathe just idle, not cutting anything, the VFD showed 13A 3 phase to the motor, the input to the drive was ~5A single phase, the VFD handles the power factor problems and draws closer to true power from the line. Roger Neal - Original Message - From: Clint Washburn cl...@clintandheidi.com To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Sent: Tuesday, March 08, 2011 7:18 PM Subject: Re: [Emc-users] Single Phase Lathe spindle motor question Ted, What kind of motor did you go with and what model of vfd do you use? Also I have not yet purchased a drive yet I am weighing my options. I am thinking of 5-7.5 hp. With the price some of the vfds are going for I would pay several times over what I paid for the lathe. Thanks, Clint On Mar 8, 2011, at 8:54 AM, Ted Hyde laser...@gmail.com wrote: emc-users-requ...@lists.sourceforge.net wrote: Message: 5 Date: Mon, 7 Mar 2011 22:03:45 -0800 From: Clint Washburncl...@clintandheidi.com Subject: [Emc-users] Single Phase Lathe spindle motor question To: 'Enhanced Machine Controller \(EMC\)' emc-users@lists.sourceforge.net Message-ID:00bd01cbdd56$99811290$cc8337b0$@com Content-Type: text/plain;charset=us-ascii I am in the process of converting my 1978 Hitachi Seiki CNC lathe to EMC. It currently has a 7.5 KW dc motor that used to be powered by FUJI SCR drive. My first problem my house does not have 3 phase power. I am having to work around this issue with my whole retrofit. I wish to convert this to a 3 phase AC spindle. What VFD's are people having success with as a spindle drive with single phase power? Is it realistic to have a 10 hp 3 phase spindle on single phase power? or will I have to go with a spindle motor closer to around 7.5hp instead? What is everyone's input on this? Clint Washburn Clint - I converted my Tsugami lathe (also 7.5Hp DC spindle) over to a 5hp AC spindle - and for testing was running on single phase 220. My AB VFD would only get the motor up to about 70% speed (2200rpm) before going into Bus Undervolt Fault - I was running this directly from the front panel of the VFD without EMC intervention at the time, so there should have been little to no regen or accel/decel problems. The spindle was also under no load (from cutting) - so under a cut scenario, I'd expect the unit to fault just as soon as the insert entered the cut. The unit functions just fine under 3phase power, of course. It may be worthwhile to note that although many VFDs with 3 phase input are built on a simple bridge-cap system, how they check the line-line voltage may differ, so going leg R-T instead of R-S (for example) may get you lucky. Alternatively, you may look at a separate DC supply, and feed the ?440 into the DC bus input on your VFDassuming your VFD supports it. I can do this on my AB, apparently. I recall Rexroth (Bosch) did this with a lot of their high end servo and spindle drives, so did Mitsu - one central DC supply, with drives that connected to the buss, instead of all AC input units. My instinct based only one one experience says you're going to have a challenge getting that 10hp spooled up on single phase. BTW - where did you get a 208vac 10hp drive? By the time you get higher than 5hp, most are wanting 380-480 inputor you have to mortgage the house. :-) Best wishes, Ted. -- What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net
[Emc-users] [OT] power factor and VFDs (was Single Phase Lathe spindle motor question)
On 3/9/2011 7:23 AM, RogerN wrote: For what it's worth, I have a lathe with a 7.5HP motor and used a 10HP Hitachi VFD like this: ... One time I let the lathe just idle, not cutting anything, the VFD showed 13A 3 phase to the motor, the input to the drive was ~5A single phase, the VFD handles the power factor problems and draws closer to true power from the line. Roger Neal Gentle persons: I don't have a dog in this fight since I don't envision ever advancing beyond fractional-horsepower motors at home. Still, Roger's comment intrigues me. A home-based shop could cause mystifying problems in the household if the power factor gets out of hand. Do VFDs really make this a non-issue? Regards, Kent -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Help with PWM spindle control
Hi all, I'm attempting to set up EMC2 to generate a PWM signal for spindle speed control. I put a DVM on the PWM parallel port pin in hopes to see an average voltage of the PWM signal. But all I see is about 90mV, and it never changes. I tried MDI commands like: M03 S100 and M03 S2000 I'm fairly new to EMC2. Can someone tell me what is required to activate the PWM output? Thanks! Tony -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Help with PWM spindle control
On 9 March 2011 13:55, Tony Zampini zampi...@cox.net wrote: I'm attempting to set up EMC2 to generate a PWM signal for spindle speed control. I put a DVM on the PWM parallel port pin in hopes to see an average voltage of the PWM signal. But all I see is about 90mV, and it never changes. I tried MDI commands like: M03 S100 and M03 S2000 I'm fairly new to EMC2. Can someone tell me what is required to activate the PWM output? Did you set up a spindle speed control in Stepgen, or are you doing by hand-editing the HAL file? You won't necessarily see the PWM signal with a multimeter, though I would expect to see something. Halscope (Machine - Halscope) set to look at the p-port pin should tell you if EMC2 thinks it is outputting to the pin. If you want to pastebin (www.pastebin.com) your HAL file (in your home/emc2/configs/machine name directory) we can have a look at it to see what is missing. -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] triac pwm control
Hello everybody, Has anybody ever made a PWM triac control hal module/component or assemble one from existing hal modules/components? There should be one input signal for zero cross detector and one output signal to control the triac gate. If not, do you think this can this be easily done using hal? Best Regards Klemen -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] triac pwm control
On 9 March 2011 15:21, Klemen Dovrtel klemen_dovr...@yahoo.com wrote: Hello everybody, Has anybody ever made a PWM triac control hal module/component or assemble one from existing hal modules/components? There should be one input signal for zero cross detector and one output signal to control the triac gate. I imagine that you could do it with oneshot. http://www.linuxcnc.org/docview/html/man/man9/oneshot.9.html Or maybe timedelay http://www.linuxcnc.org/docview/html/man/man9/timedelay.9.html (With a suitably calibrated scale function) -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Help with PWM spindle control
On Wednesday, March 09, 2011 10:14:39 AM Tony Zampini did opine: Hi all, I'm attempting to set up EMC2 to generate a PWM signal for spindle speed control. I put a DVM on the PWM parallel port pin in hopes to see an average voltage of the PWM signal. But all I see is about 90mV, and it never changes. I tried MDI commands like: M03 S100 and M03 S2000 It is my finding that the line sequence counts. IOW: S100 M3 or S2500 m3 Always works. You must set the speed at least a line prior to issuing the M3 command. You will also need to set the pwm generator up in your .hal file, which in my case (I'm using a 4 axis xylotex/pmdx-106 interface to the speed controller that was in the gear housing of my mill, but which now lives in a box with the pmdx-106) loadrt pwmgen output_type=0 addf pwmgen.make-pulses base-thread addf stepgen.update-freq servo-thread addf pwmgen.update servo-thread net spindle-cmd = motion.spindle-speed-out = pwmgen.0.value net spindle-enable = motion.spindle-on = pwmgen.0.enable net spindle-pwm = pwmgen.0.pwm setp pwmgen.0.pwm-freq 100.0 setp pwmgen.0.scale 3833. setp pwmgen.0.offset 0.173913043478 setp pwmgen.0.dither-pwm true net spindle-ccw = motion.spindle-reverse net spindle-ccw = parport.0.pin-14-out net spindle-pwm = parport.0.pin-16-out This is the order they occur in my file, but there may be other non-spindle related items intermixed. A side comment that could be called a bug exists in my setup with the above scale factors because the pwmgen is designed to run at say 1% duty minimum, to maybe 98% maximum, but because the pmdx-106 uses the activity of the signal as its enable, asking the pwngen for a 100% duty cycle leaves it sitting high, so the activity sense is lost and my spindle drops out and stops. At a spindle speed over ride of about 105%. I'm fairly new to EMC2. Can someone tell me what is required to activate the PWM output? Thanks! Tony HTH, Tony, and welcome to the list. -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz We prefer to speak evil of ourselves rather than not speak of ourselves at all. -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Single Phase Lathe spindle motor question
Clint - I have an older Allen Bradley 1336S drive (courtesy of ebay) - the collection of 5hp units I got without operator panels, and then finding a panel, probably ran me about $150. I don't see those drives at that price ($40 each!) on ebay currently. The motor was a 5hp Craigslist find, about $60. I added a new pulley and bushing for another $100. My power service is in a medium-industrial area, and sits pretty stable at 212 VAC, +/- 1v variance leg-leg, with a recorded typical of less than 5% variance. My mazak says it's at 60.2 Hz - so it's right on the money for USA domestic service. We are on a recent (last 3 years) installed site transformer, and one of only two customers on it. I cut typically aluminum and polymers, and the load meter has always been less than 50% with the exception of accel and decel. Even in a mild steel or stainless cut, 0.070 engagement, was only 40% loaded. I have inserts that will allow 200thou DOC, but I'm not expecting to use that capacity. My limiting factor really isn't power for my applications, it's surface speed; I top out around 3500 RPM now, and while that's more than sufficient for aluminum at 2, it gets kind of slow at 1/4. I do not currently employ an external resistor, although I should. EMC controls the external PID loop, while the drive takes care of the inner accel/decel loop - ie. the drive's accel/decel is faster than EMC and rarely takes precedence, but is there in case EMC (or I) command it to do something stupid. The spindle has a full A/B/Z encoder on it for feedback. It is NOT run in a tight servo-loop, just a relaxed at-speed loop. It's fine for threading straight, but needs a little tightening for tapers still. (change in surface speed related). I pulley'ed up the motor as large as I can go (given physical space restrictions) - the 3500 is actually more than what the lathe originally did (2880 to 3000) on it's DC motor, so I guess I should be happy. The motor I have on there now has class-H insulation, so it's technically not inverter-grade - thus I'm not going to overclock the VFD - it's running at 60Hz. Many VFDs you can freq-up to 100 or even 120Hz, but consensus is that you really Should have an inverter-duty motor for that. Aside from lucky finds, I'd look at either surpluscenter.com or automationdirect.com for retail units - probably cost as much to ship as they do to buy - a 5hp motor will weigh about 151 lbs - just enough when crated to be over UPS small package, so it goes by truck. However you could still have yourself a decent motor for about $500. I understand the retrofit cost versus the iron cost - I paid $500 for my Tsugami complete, but $1200 to truck it, and have probably sunk only an additional $2k of gear into it. However, exclusive of labor, it has already paid for itself. I have no doubt my hobby lathe will continue to be such until the day it is retired - it's unlikely it would ever be a completed project - one more bell or whistle to add to it, a software upgrade etc. If you can find a servo drive for that size of motor, I'd recommend it - if you think C-Axis work will be in your future. You can use a VFD to work as a servo drive (hack, cough. disclaimer), but the challenge is that most VFD's have a built in accel/decel profile that has a minimum setting of 0.1 seconds, not 0 seconds or disabled. So although EMC could control the servo loop, it will always have that 0.1 sec (*2) delay. Which won't get you consistent or repeatable results in absolute degrees. I originally had a VFD on my turret toolchange motor, and although it would work, it took a lot of effort and multiple gear changes to get it there. Even then, if it went from one tool to a neighboring tool (like #3 to #4) it would often hunt for a few seconds before it was close enough to let the turret lock again. There is now a real servo with gearhead and a real servo drive on there and the difference is night and day. I don't have a C axis going on my unit yet, but I plan on following what Tsugami did in the past - the headstock has provisions for clutching in and out a secondary servo for fine positioning. Since the mech is already there, I just have to find a suitable servo for it. One final caveat - the firmware in my AB spindle drive is set for forward run only - however I haven't used a tool that I need to run backwards. Ted. - Original Message - From: Clint Washburn cl...@clintandheidi.com To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Sent: Tuesday, March 08, 2011 7:18 PM Subject: Re: [Emc-users] Single Phase Lathe spindle motor question Ted, What kind of motor did you go with and what model of vfd do you use? Also I have not yet purchased a drive yet I am weighing my options. I am thinking of 5-7.5 hp. With the price some of the vfds are going for I would pay several times over what I paid for the lathe. Thanks, Clint --
Re: [Emc-users] Single Phase Lathe spindle motor question
On Wed, 2011-03-09 at 06:48 -0500, Steve Stallings wrote: ... snip Using a transformer for voltages lower than rated is generally OK as is running them in reverse. The ratio may prove to be slightly off because the manufacturer may have adjusted the stated ratio to compensate for the losses in the windings but this is typically only a few percent. Steve Stallings Good point. My setup was a jury rig with a low load, and I was tending to keep an eye on voltages, current and temperatures. I suppose if I were to put this into a system for normal use, I should verify that the core will never saturate. Thanks for the reminder. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] triac pwm control
On Wednesday, March 09, 2011 11:26:57 AM Klemen Dovrtel did opine: Hello everybody, Has anybody ever made a PWM triac control hal module/component or assemble one from existing hal modules/components? There should be one input signal for zero cross detector and one output signal to control the triac gate. If not, do you think this can this be easily done using hal? Best Regards Klemen The two reasons I would not consider using a triac in a servo are: 1 the triac needs a zero crossing of several microseconds duration in order to reliably turn off. 2. you are married to the powerline frequency for updating the firing angle because once fired its going to be on for the rest of that powerline half cycle. That is too slow for decent servo response. One might be able to raise the operating frequency to 400 hz with a motor generator but at 400 hz, I'd question the safety time to get a good shutoff at the zero crossing since the available reset time is much shorter at 400 hz. This is why I'm personally in favor of a pwm driven hexfet controller, you can, with adequate drive, turn one of them on or off in much less than a microsecond thereby reducing the ohmic losses during the transition time, which in turn allows it do so at 15K-50K times a second without excessive heating, bringing real time speed control into the smaller horsepower world. My spindle speed is so stiff I gave up and put an ammeter in so I could see how hard it was working, it cannot be heard to slow before the fuse clears. And this is the controller that came in my micromill, with only the hexfet replaced because it wasn't adequately rated in the first place. This style of controller can be scaled up to 10 or more kw. But it is not a position servo, capable of holding a set position like a real servo can. -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz The world is full of people who have never, since childhood, met an open doorway with an open mind. -- E.B. White -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
Kirk Wallace wrote: It might be hard to find a VFD rated higher than a few HP that can run on 240VAC input. http://www.automationdirect.com/adc/Overview/Catalog/Drives/GS2_%28115_-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control%29 Short URL: http://alturl.com/qhdpo I am running an 11 KW Toshiba VFD on 240 single-phase, and it is perfectly happy. A few models have phase loss detection, and will fault if they don't have all three phases. Most under 10 Hp don't seem to have that problem. You do need to derate the drive for single phase, if it is not designed for it. But, remember, these drives are designed to run inside cabinets at 40 C, 20/7 for 10 years or so. That is not typical home shop duty, so the drive gets a big break by not running all the time at full load. The higher HP drives seem to need 460VAC. I bought a VFD from eBay and No, there are drives up to 100 HP for 240 V supply. These will cost a FORTUNE, even on eBay. The 480 V drives have transistors rated for half the current and twice the voltage, and they are a lot cheaper. Most industrial sites with 100 Hp motors have 480 power. The current draw of a 100 Hp motor on 240 V is about 330 A per line! Yikes, the transistors must be the size of a brick! Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Background images in a GladeVCP window
Viesturs requested this so he could display a functional diagram in gladevcp window, with HAL widgets placed at arbitrary positions over the image. This is easy to do - a note is in the HAL Widgets Wiki page (http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?HalWidgets at the very end) example code is in: http://git.mah.priv.at/gitweb/gladevcp-image.git We understand a stunning example will be forthcoming shortly from Viesturs ;-) - Pavel Michael -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] [OT] power factor and VFDs (was Single Phase Lathe spindle motor question)
Kent A. Reed wrote: Still, Roger's comment intrigues me. A home-based shop could cause mystifying problems in the household if the power factor gets out of hand. Do VFDs really make this a non-issue? Unless you have REALLY marginal power, such as a 60 A 240 V feed, and central air conditioning, electric clothes dryer, etc. I just wouldn't worry about power factor. Yes, modern VFDs are designed to keep the power factor relatively high, maybe 80% or so worst-case. They do give a non-linear distortion by drawing their current at the voltage peaks, but the phase angle is kept small. Probably the BEST feature in this regard is slow-start. You can set the acceleration ramp for a fraction of a second, and there is no dimming of lights when large motors are started. If I had my 7.5 HP lathe on an RPC, I know the lights would dim appreciably when I started it. Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Help with PWM spindle control
gene heskett wrote: It is my finding that the line sequence counts. IOW: S100 M3 or S2500 m3 Always works. You must set the speed at least a line prior to issuing the M3 command. Huh? I have NEVER done this, I ALWAYS code it on the same line, either in my .ngc program or with MDI, and it always works. I agree, you can't do it in the reverse order, ie. M03 S1000 That won't work, at least on some systems. Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Curious toolholder
Not such a bad idea... http://www.youtube.com/watch?v=xUAPrkC7Q-Qfeature=feedrec_grec_index -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] thoughts on synergy
I have been tinkering with a V90 I bought in December learning to write gcode and using hand written programs making gadgets Now I would like to try CAD/CAM apps I have no experience with either The only hard fast requirement is it run under Linux Synergy seems a good match Opinions??? Richard -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] thoughts on synergy
Synergy works well for me but since I had no drafting/cad training it came up slow. However, it is very powerful which is one reason for the steep learning curve. The embedded demos are very helpful. There is a 30 day free demo that I would suggest you try. It has taken me a while but now I can't live without synergy ... well and get anything done. Use it everyday. :-) Dave On Wed, 2011-03-09 at 12:57 -0600, kqt4a...@comcast.net wrote: I have been tinkering with a V90 I bought in December learning to write gcode and using hand written programs making gadgets Now I would like to try CAD/CAM apps I have no experience with either The only hard fast requirement is it run under Linux Synergy seems a good match Opinions??? Richard -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Curious toolholder
On Wed, 2011-03-09 at 18:02 +, andy pugh wrote: Not such a bad idea... http://www.youtube.com/watch?v=xUAPrkC7Q-Qfeature=feedrec_grec_index Not so new. Been in the hobby world for years. Dave -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] thoughts on synergy
how much does it cost? On Wed, Mar 9, 2011 at 1:16 PM, dave dengv...@charter.net wrote: Synergy works well for me but since I had no drafting/cad training it came up slow. However, it is very powerful which is one reason for the steep learning curve. The embedded demos are very helpful. There is a 30 day free demo that I would suggest you try. It has taken me a while but now I can't live without synergy ... well and get anything done. Use it everyday. :-) Dave On Wed, 2011-03-09 at 12:57 -0600, kqt4a...@comcast.net wrote: I have been tinkering with a V90 I bought in December learning to write gcode and using hand written programs making gadgets Now I would like to try CAD/CAM apps I have no experience with either The only hard fast requirement is it run under Linux Synergy seems a good match Opinions??? Richard -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] thoughts on synergy
On Wed, 9 Mar 2011, Igor Chudov wrote: how much does it cost? I did not see a price for Synergy, only contact customer support Another interesting CAM app is SheetCAM Synergy works well for me but since I had no drafting/cad training it came up slow. However, it is very powerful which is one reason for the steep learning curve. The embedded demos are very helpful. There is a 30 day free demo that I would suggest you try. It has taken me a while but now I can't live without synergy ... well and get anything done. Use it everyday. :-) Dave On Wed, 2011-03-09 at 12:57 -0600, kqt4a...@comcast.net wrote: I have been tinkering with a V90 I bought in December learning to write gcode and using hand written programs making gadgets Now I would like to try CAD/CAM apps I have no experience with either The only hard fast requirement is it run under Linux Synergy seems a good match Opinions??? Richard -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] thoughts on synergy
I just talked to Bob Schuppel at Synergy. $250 will now get you 2D plus 3D wireframe. It does not get you Solids ( aka parasolids with extensions) Wireframe is more difficult to use than Solids but pretty powerful. Bob was telling me about a case in Solidworks that would not machine. In wireframe they corrected it to a machinable object. :-) Now that IMO is a pretty good deal. Dave On Wed, 2011-03-09 at 13:43 -0600, kqt4a...@comcast.net wrote: On Wed, 9 Mar 2011, Igor Chudov wrote: how much does it cost? I did not see a price for Synergy, only contact customer support Another interesting CAM app is SheetCAM Synergy works well for me but since I had no drafting/cad training it came up slow. However, it is very powerful which is one reason for the steep learning curve. The embedded demos are very helpful. There is a 30 day free demo that I would suggest you try. It has taken me a while but now I can't live without synergy ... well and get anything done. Use it everyday. :-) Dave On Wed, 2011-03-09 at 12:57 -0600, kqt4a...@comcast.net wrote: I have been tinkering with a V90 I bought in December learning to write gcode and using hand written programs making gadgets Now I would like to try CAD/CAM apps I have no experience with either The only hard fast requirement is it run under Linux Synergy seems a good match Opinions??? Richard -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On Wed, 2011-03-09 at 08:32 -0800, Kirk Wallace wrote: On Wed, 2011-03-09 at 06:48 -0500, Steve Stallings wrote: ... snip Using a transformer for voltages lower than rated is generally OK as is running them in reverse. The ratio may prove to be slightly off because the manufacturer may have adjusted the stated ratio to compensate for the losses in the windings but this is typically only a few percent. Steve Stallings Good point. My setup was a jury rig with a low load, and I was tending to keep an eye on voltages, current and temperatures. I suppose if I were to put this into a system for normal use, I should verify that the core will never saturate. Thanks for the reminder. Indeed a good reminder. I knew that kind of thing when, in the 6th grade, I was winding transformers but I had kinda forgotten about that; and a bunch of other things. Dave -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On Wed, 2011-03-09 at 11:12 -0600, Jon Elson wrote: Kirk Wallace wrote: It might be hard to find a VFD rated higher than a few HP that can run on 240VAC input. http://www.automationdirect.com/adc/Overview/Catalog/Drives/GS2_%28115_-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control%29 Short URL: http://alturl.com/qhdpo I am running an 11 KW Toshiba VFD on 240 single-phase, and it is perfectly happy. A few models have phase loss detection, and will fault if they don't have all three phases. Most under 10 Hp don't seem to have that problem. You do need to derate the drive for single phase, if it is not designed for it. But, remember, these drives are designed to run inside cabinets at 40 C, 20/7 for 10 years or so. That is not typical home shop duty, so the drive gets a big break by not running all the time at full load. The higher HP drives seem to need 460VAC. I bought a VFD from eBay and No, there are drives up to 100 HP for 240 V supply. These will cost a FORTUNE, even on eBay. The 480 V drives have transistors rated for half the current and twice the voltage, and they are a lot cheaper. Most industrial sites with 100 Hp motors have 480 power. The current draw of a 100 Hp motor on 240 V is about 330 A per line! Yikes, the transistors must be the size of a brick! Just think about the heat sink, even in switching mode. ;-) Dave Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] triac pwm control
On Wed, 2011-03-09 at 11:45 -0500, gene heskett wrote: On Wednesday, March 09, 2011 11:26:57 AM Klemen Dovrtel did opine: Hello everybody, Has anybody ever made a PWM triac control hal module/component or assemble one from existing hal modules/components? There should be one input signal for zero cross detector and one output signal to control the triac gate. If not, do you think this can this be easily done using hal? Best Regards Klemen The two reasons I would not consider using a triac in a servo are: 1 the triac needs a zero crossing of several microseconds duration in order to reliably turn off. 2. you are married to the powerline frequency for updating the firing angle because once fired its going to be on for the rest of that powerline half cycle. That is too slow for decent servo response. One might be able to raise the operating frequency to 400 hz with a motor generator but at 400 hz, I'd question the safety time to get a good shutoff at the zero crossing since the available reset time is much shorter at 400 hz. This is why I'm personally in favor of a pwm driven hexfet controller, you can, with adequate drive, turn one of them on or off in much less than a microsecond thereby reducing the ohmic losses during the transition time, which in turn allows it do so at 15K-50K times a second without excessive heating, bringing real time speed control into the smaller horsepower world. My spindle speed is so stiff I gave up and put an ammeter in so I could see how hard it was working, it cannot be heard to slow before the fuse clears. And this is the controller that came in my micromill, with only the hexfet replaced because it wasn't adequately rated in the first place. This style of controller can be scaled up to 10 or more kw. But it is not a position servo, capable of holding a set position like a real servo can. I have 3 Fanuc servo drives (SCR) just sitting on the shelf. They are available cheap after I take off the contactor. They need ( IIRC ) 90 volts 3ph AC and 18 v dc(?). Dave -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] triac pwm control
On 9 March 2011 20:05, dave dengv...@charter.net wrote: I have 3 Fanuc servo drives (SCR) just sitting on the shelf. They are available cheap after I take off the contactor. They need ( IIRC ) 90 volts 3ph AC and 18 v dc(?). For DC servos, or Brushless? (Yellow or red cap) The reason I ask is that the bldc component ought to be able to synthesise the red-cap commutation signals from any other motor feedback type, but is totally untested. -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] thoughts on synergy
On Wed, 9 Mar 2011, dave wrote: I just talked to Bob Schuppel at Synergy. $250 will now get you 2D plus 3D wireframe. It does not get you Solids ( aka parasolids with extensions) Wireframe is more difficult to use than Solids but pretty powerful. Bob was telling me about a case in Solidworks that would not machine. In wireframe they corrected it to a machinable object. :-) Now that IMO is a pretty good deal. Dave In one of the documents at their site I read Synergy is capable of reading DXF ASCII data files in a limited way. You can not export DXF files from Synergy. This seems quite restrictive -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] thoughts on synergy
On 9 March 2011 20:21, kqt4a...@comcast.net wrote: Synergy is capable of reading DXF ASCII data files in a limited way. You can not export DXF files from Synergy. This seems quite restrictive DXF is nasty anyway. Not even AutoCAD can reliably read DXF files created by their own software. -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] thoughts on synergy
On Wed, 2011-03-09 at 14:21 -0600, kqt4a...@comcast.net wrote: On Wed, 9 Mar 2011, dave wrote: I just talked to Bob Schuppel at Synergy. $250 will now get you 2D plus 3D wireframe. It does not get you Solids ( aka parasolids with extensions) Wireframe is more difficult to use than Solids but pretty powerful. Bob was telling me about a case in Solidworks that would not machine. In wireframe they corrected it to a machinable object. :-) Now that IMO is a pretty good deal. Dave In one of the documents at their site I read Synergy is capable of reading DXF ASCII data files in a limited way. You can not export DXF files from Synergy. This seems quite restrictive In theory one can import/export dxf or iges. Sometimes it works sometimes not. Depends on the version of dxf. D -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On Wed, 2011-03-09 at 11:12 -0600, Jon Elson wrote: Kirk Wallace wrote: It might be hard to find a VFD rated higher than a few HP that can run on 240VAC input. http://www.automationdirect.com/adc/Overview/Catalog/Drives/GS2_%28115_-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control%29 Short URL: http://alturl.com/qhdpo I am running an 11 KW Toshiba VFD on 240 single-phase, and it is perfectly happy. A few models have phase loss detection, and will fault if they don't have all three phases. Most I was just going by the data on the GS2 datasheet, and AssUMeing that their product line would be typical. With a little more insight I now realize my assumption is wrong. My bad. I'm really not very good beyond 3 HP. I'm looking forward to see how this story ends. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] thoughts on synergy
On Wed, 2011-03-09 at 11:16 -0800, dave wrote: Synergy works well for me but since I had no drafting/cad training it came up slow. However, it is very powerful which is one reason for the steep learning curve. The embedded demos are very helpful. There is a 30 day free demo that I would suggest you try. It has taken me a while but now I can't live without synergy ... well and get anything done. Use it everyday. :-) Dave I have had the same experience as Dave. I don't use mine often enough to keep current, so it is a challenge to get up to speed when I do use it. It can do some really cool stuff if you take the time to learn it. I have the full 3D version, which a few years ago cost $900. I don't know what is costs now. To me, it seems a little over priced, but it is very important to me to stay with Linux apps, and Synergy is the only serious 3D software around. I have a page of notes from a few years ago: http://www.wallacecompany.com/machine_shop/Synergy/ One thing that I keep forgetting, but might be useful, you can open more than one instance at a time (open more than one Synergy). This allows you to work on more than one part, or while learning, check on features and help while you are in the middle of a procedure. Having two screens might be good too. I think anyone that tries to learn Synergy will, at times, curse it, but once you get used to it, it should be worth it. Another thing, Synergy needs a software key which is particular to your PC. If you change your PC, you will most likely need to call Weber Systems to get a new key, which is a code that you type in. If you don't have a key, I think the 3D features are locked out. From the last time I checked, Synergy only works with certain Linux distributions. I think newer Ubuntu's should be okay, but maybe not the latest. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] [OT] power factor and VFDs (was Single Phase Lathe spindle motor question)
- Original Message - From: Kent A. Reed knbr...@erols.com To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Sent: Wednesday, March 09, 2011 7:31 AM Subject: [Emc-users] [OT] power factor and VFDs (was Single Phase Lathe spindle motor question) On 3/9/2011 7:23 AM, RogerN wrote: For what it's worth, I have a lathe with a 7.5HP motor and used a 10HP Hitachi VFD like this: ... One time I let the lathe just idle, not cutting anything, the VFD showed 13A 3 phase to the motor, the input to the drive was ~5A single phase, the VFD handles the power factor problems and draws closer to true power from the line. Roger Neal Gentle persons: I don't have a dog in this fight since I don't envision ever advancing beyond fractional-horsepower motors at home. Still, Roger's comment intrigues me. A home-based shop could cause mystifying problems in the household if the power factor gets out of hand. Do VFDs really make this a non-issue? Regards, Kent I didn't realize this until someone explained it replying to posts about VFD's on a metalworking newsgroup, that's why I measured it. On the line side you have rectifiers and capacitors for your DC Bus voltage. On the motor side you have the inductive load powered by the DC bus through switching semiconductors. I don't think power factor is a huge issue for a home shop but it was nice to find out my drive was only using 5A single phase at idle when the motor was using 13A three phase. This was good for me to know since I share the 240V 30A circuit with the dryer, welders, and air compressor, just have to make sure I don't run too much at once, so far I've never tripped the breaker! Roger Neal -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
Kirk Wallace schrieb: I'm looking forward to see how this story ends. Gentlemen, as I mentioned before, telling from the (for me) amazingly immense response to this topic (which actually has nothing to do with emc2), I see a tremendous need for decent power supply in the US, probably especially on the countryside. I mailed to this list about a year ago that here in Germany (and in most of Europe), every house, new built or less than 30 to 40 years old, has a 3 phase electric supply with at least 3 x 50 amps main fuse and at least 3 x 35 amps selective fuse per inhabitant family in front of the measuring device. That means a capability of some 50 kW three phase per house. You can't have it any else, not even if you try, it's in the basic conditions of the suppliers. If you apply for a building license at the local administration to erect a new house you can't help getting at least this type of electric supply line just like public water supply and sewage disposal. So, I never had any problem running large motors like e.g. my 10 kW circular saw for firewood cutting, welding equipment etc. For household purposes, the three 400 V phases are usually split into three 230 V, 16 amps circuits, each one leg grounded, after the electric counter. This has the benefit that upon failure of one or two phases, there will be no complete black-out in the house. Even small appartments have more than one phase supply to benefit from this black out protection. Without this stable infrastructure, the booming solar panels on very many houses couldn't feed their energy into the public supply net. I think it would be worth wile to build up a powerful lobby in the US to enforce decent power supply for everyone - what a shame for the most powerful and most technically oriented country in the world to discuss about how to get motors and machines running! Why not write letters to your representatives instead of discussing weird solutions with lots of condensers, inductors, VFD's and so on if there are very simple, straightforward methods to power a machine? In virtually every country in the world electrical power is produced, transported and distributed as three-phase-current, also in the US, because this is the most efficient way. Why not down to the very customer? Exert pressure on those representatives and your suppling companies! VFD's should only be used when varying frequency is desired and to convert single phase to three phase current on a low level base, say below 1 kW, if a three phase supply doesn't seem economical. That's what they are made for. Analyzing costs, a decent three phase power supply line must be cheaper and much more reliable than a VFD. Peter Blodow -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Curious Toolholder
I've had one of the Diamond toolholder for years and I love it!! It also comes with an adapter to hold the toolbit at the proper angle when resharpening, making such a task a snap. The ONLY time I don't use it is when the particular job calls for a carbide bit, otherwise, the Diamond toolholder stays in my lathe. Highly recommended!! Dennis -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On 9 March 2011 22:34, Peter Blodow p.blo...@dreki.de wrote: I mailed to this list about a year ago that here in Germany (and in most of Europe), every house, new built or less than 30 to 40 years old, has a 3 phase electric supply Not in the UK, more's the pity. If you want three phase you need to pay thousands of pounds. (or tens of thousands if you are any distance from the other phases) -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On Wednesday, March 09, 2011 08:02:40 PM Jon Elson did opine: Kirk Wallace wrote: It might be hard to find a VFD rated higher than a few HP that can run on 240VAC input. http://www.automationdirect.com/adc/Overview/Catalog/Drives/GS2_%28115 _-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control%29 Short URL: http://alturl.com/qhdpo I am running an 11 KW Toshiba VFD on 240 single-phase, and it is perfectly happy. A few models have phase loss detection, and will fault if they don't have all three phases. Most under 10 Hp don't seem to have that problem. You do need to derate the drive for single phase, if it is not designed for it. But, remember, these drives are designed to run inside cabinets at 40 C, 20/7 for 10 years or so. That is not typical home shop duty, so the drive gets a big break by not running all the time at full load. The higher HP drives seem to need 460VAC. I bought a VFD from eBay and No, there are drives up to 100 HP for 240 V supply. These will cost a FORTUNE, even on eBay. The 480 V drives have transistors rated for half the current and twice the voltage, and they are a lot cheaper. Most industrial sites with 100 Hp motors have 480 power. The current draw of a 100 Hp motor on 240 V is about 330 A per line! Yikes, the transistors must be the size of a brick! Jon I am wondering where you got those figures Jon? At one tv station, KNXE, channel 19 NE of Norfolk NE, the klystrons coolant was cooled by a radiator about 4 feet wide, a foot thick and about 10 feet long, which had a quad of 16 torrington wheels on a long shaft, each wheel a good foot wide, turned by a 3 phase 220 volt 20 HP rated electric motor to pull cooling air through it. The FLA according to the nameplate was 39 amps/phase, and we adjusted pulley sizes seasonally to keep the motor running within a couple of amps of that 39/phase. Warmer air weighs less, so we could up the motor pulley about an inch in the summer, but had to drop it back come cooler weather which made it denser. One morning in the spring after I had put the bigger pulley on the motor, the exit louver failed to open, the honeywell modutrol motor had failed. It ripped the lead anchored lag bolts, about 36 of them, right out of the 12 thick cement blocks surrounding that 4x8 foot louver and blew it out in the back yard about 6 feet. That was fun putting that back in while 50+ mph hot air was coming out. Lots of heavy timber cribbing involved. But that was a 20HP motor, running on 235V 3 phase, and drew 39 amps/phase at rated power output. So a 100 HP motor would have needed only 195 amps, not 330/phase. That much heat differential has got to make smoke I'd think. -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz Has everybody got HALVAH spread all over their ANKLES?? ... Now, it's time to HAVE A NAGEELA!! -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] thoughts on synergy
On Wednesday, March 09, 2011 08:25:07 PM dave did opine: Synergy works well for me but since I had no drafting/cad training it came up slow. However, it is very powerful which is one reason for the steep learning curve. The embedded demos are very helpful. There is a 30 day free demo that I would suggest you try. It has taken me a while but now I can't live without synergy ... well and get anything done. Use it everyday. :-) Dave I agree, it probably would be nice, but I'm retired, and $2500 for software is not in my budget. I get in enough trouble buying new $200 toys. ;-) -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz Marriage is like twirling a baton, turning handsprings, or eating with chopsticks. It looks easy until you try it. -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Curious toolholder
On Wednesday, March 09, 2011 08:33:49 PM dave did opine: On Wed, 2011-03-09 at 18:02 +, andy pugh wrote: Not such a bad idea... http://www.youtube.com/watch?v=xUAPrkC7Q-Qfeature=feedrec_grec_index Not so new. Been in the hobby world for years. Dave Now thats cute, where can I get one for 3/8 or 5/16 slotted toolposts as supplied with my puny little 7x12? -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz They are called computers simply because computation is the only significant job that has so far been given to them. -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Can you help me identify and control my spindle motor?
I inherited a Dental Mill and I have it working with EMC2, but I'm having some small problems with the spindle motor. Sometime it doesn't want to start. It turns about 120-degrees over and over but doesn't spin up. Sometimes it spins up fine. I can always get it started by toggling the spindle on/off a few times. Then when I hit Play, the spindle stops, but always starts up. I also think the spindle is running slower than it can. Just a hunch. The interface is a home-made parallel-port board, and the creator didn't document the spindle controls part. He's got 3 DIP switches that run to pins on a 2x8 0.1 Inch ribbon cable to a port on the controller that says PROCAM on it. I've posted photos of the PCBs at: https://picasaweb.google.com/AlanKilian/Misc# I have failed in my attempt to get the google to provide much help. Has anyone seen anything like this? I'd sure appreciate any help. Thank you, -Alan Kilian (bobodyne.com) -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
Peter Blodow wrote: I think it would be worth wile to build up a powerful lobby in the US to enforce decent power supply for everyone - what a shame for the most powerful and most technically oriented country in the world to discuss about how to get motors and machines running! The infrastructure changes that would be required are beyond belief. For instance, there is 3 phase 7200 V power half a block away from me, but there is only one phase 7200 V main running down my street, and it runs for at least half a mile down the major street, then branches into the side streets. So, all those houses and streets have ONLY single-phase high tension. I can think of areas I've been where the high tension single phase feed goes for literally many miles down rural roads. In cities, there is often 3-phase high tension feeders near to every house, but even still, there is a HUGE amount of infrastructure that would have to be changed. So, poles would need to be replaced or at least have cross-arms added, all residential transformers in the country would have to be replaced, all service lead-ins would have to be changed from 3-wire to 4-wire, all residential meters would have to be replaced, all circuit breaker panels would have to be replaced. Then, you have to figure eventually replacing all major loads such as ovens, clothes dryers and air conditioners with 3-phase. My house has its own, personal 50 KVA transformer. We have 200 A 240 V service, so that is 48 KVA. Can you imaging the industry that would have to develop to replace EVERY residential transformer in the WHOLE country? Few homes have any 3-phase loads unless they have serious home shops, so really the need for 3-phase power is not that big a problem, especially now that VFDs are available. Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
Peter Blodow wrote: VFD's should only be used when varying frequency is desired and to convert single phase to three phase current on a low level base, say below 1 kW, if a three phase supply doesn't seem economical. That's what they are made for. Analyzing costs, a decent three phase power supply line must be cheaper and much more reliable than a VFD. Where I work, every motor over maybe 1 Hp is run on a VFD, and they have 230 and 480 V 3-phase power available in all mechanical rooms. Mostly for energy reduction by variable speed, but it also helps their power factor. They have WALLS of VFDs in the equipment rooms. Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
gene heskett wrote: On Wednesday, March 09, 2011 08:02:40 PM Jon Elson did opine: The current draw of a 100 Hp motor on 240 V is about 330 A per line! Yikes, the transistors must be the size of a brick! Jon I am wondering where you got those figures Jon? OK, I was extrapolating from a 1 Hp Bridgeport motor, which is rated at 3.3 A at 240 V. Obviously, there is an efficiency scaling factor I didn't take into account for larger motors. Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On Wed, Mar 9, 2011 at 11:57 PM, Jon Elson el...@pico-systems.com wrote: gene heskett wrote: On Wednesday, March 09, 2011 08:02:40 PM Jon Elson did opine: The current draw of a 100 Hp motor on 240 V is about 330 A per line! Yikes, the transistors must be the size of a brick! I am wondering where you got those figures Jon? OK, I was extrapolating from a 1 Hp Bridgeport motor, which is rated at 3.3 A at 240 V. Obviously, there is an efficiency scaling factor I didn't take into account for larger motors. Look at this baby: http://goo.gl/QBuc1 100 HP motor by Baldor They say it takes 224 amps at 230v. i -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Curious toolholder
I got mine here... http://www.eccentricengineering.com.au/ I use it on a 9x20 I just CNCed. I accidently got the programming wrong turning 150mm diameter mild steel interrupted cut of 2mm depth, and it had no problem. There is a lot of overhang though and causes some movement with my AXA toolholder. It is also awkward to set up as a permanent CNC tool because the tool post needs to be rotated to get correct clearance. -Original Message- From: gene heskett [mailto:ghesk...@wdtv.com] Sent: Thursday, 10 March 2011 12:35 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Curious toolholder On Wednesday, March 09, 2011 08:33:49 PM dave did opine: On Wed, 2011-03-09 at 18:02 +, andy pugh wrote: Not such a bad idea... http://www.youtube.com/watch?v=xUAPrkC7Q- Qfeature=feedrec_grec_inde x Not so new. Been in the hobby world for years. Dave Now thats cute, where can I get one for 3/8 or 5/16 slotted toolposts as supplied with my puny little 7x12? -- -- -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz They are called computers simply because computation is the only significant job that has so far been given to them. -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On Thu, 2011-03-10 at 00:09 -0600, Igor Chudov wrote: ... snip Look at this baby: http://goo.gl/QBuc1 100 HP motor by Baldor They say it takes 224 amps at 230v. i This one is cheaper :) http://www.surpluscenter.com/item.asp?item=10-1977catname=electric but runs 460V. I think Gene needs one for his mill. Even better: http://www.powerzoneequipment.com/inventory_item.asp?StockNo=53388Description=1000+HP+Electric+Motor+-+Allis+Chalmers Short URL: http://alturl.com/ynqai -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On Thursday, March 10, 2011 01:13:26 AM Jon Elson did opine: gene heskett wrote: On Wednesday, March 09, 2011 08:02:40 PM Jon Elson did opine: The current draw of a 100 Hp motor on 240 V is about 330 A per line! Yikes, the transistors must be the size of a brick! Jon I am wondering where you got those figures Jon? OK, I was extrapolating from a 1 Hp Bridgeport motor, which is rated at 3.3 A at 240 V. Obviously, there is an efficiency scaling factor I didn't take into account for larger motors. Jon I don't know as I'd say it was obvious, but in comparison to a 120 volt 1/4 horse single phase capacitor start, which on most nameplates draws about 4.6 amps for that 1/4 horse, there must be an efficiency of scale that is not directly related to the single phase vs 3 phase condition. That is a big hit all by itself. The motor in question did not get so warm that you could not rest your hand on it at the end of a 19 hour broadcast day unless you had sensitive hands. At one point, while fighting with the linkage timing of one of those modutrol motors, I actually sat on it, 7 feet up in the air, for about 45 minutes while attempting to adjust the linkage to get a quasi-linear response in the air flow allowed so the coolant didn't get too cold and viscous to flow through those $150,000 klystrons, who have a very picky appetite when you already have a 25% (absolute max 30% else it gets too stiff to pump well) mix of pure, technical grade E-glycol in the system, and its 15F below the freezing point of that mix on the other side of the wall, so we have to restrict the airflow under those conditions to keep it flowing well. We often left the pumps running all night with the louvers closed as the pumping losses kept it up to about 80F when the blowers were off. With nearly 200 kw worth of heat, and a 250 gallon storage tank, we could apply beam power and open the louvers with the same signal, the louvers would start to open and open too fast so the coolant dropped about 60F, then as the louvers got some feedback and closed to just a crack, and in about an hour it would get back up to about 65F in the tank. This is HVAC tech, and it is not well publicized or taught, that a multivane louver flows about 50% of is max flow, when only opened about 8%, so you normally adjust the arms on the modutrol so that the off position is pointed directly down the connecting rod to the louvers lever, which is at that point nearly 90 degrees to the rod. So the first 10 degrees of modutrol motion only opens the louver 1 or 2%, then at the other end of the travel, wide open, the louver arm should point pretty close to straight down the coupling rod so the last 10% of the modutrol's motion takes the louver from about 30% open to wide open. Anything less than that setup, the temps will overshoot and the whole thing oscillates at about one cycle every 2 to 3 minutes since the modutrols take 90 seconds to run end to end. Your trivia lesson for today. ;) -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz I saw a subliminal advertising executive, but only for a second. -- Steven Wright -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On Thursday, March 10, 2011 01:49:45 AM Igor Chudov did opine: On Wed, Mar 9, 2011 at 11:57 PM, Jon Elson el...@pico-systems.com wrote: gene heskett wrote: On Wednesday, March 09, 2011 08:02:40 PM Jon Elson did opine: The current draw of a 100 Hp motor on 240 V is about 330 A per line! Yikes, the transistors must be the size of a brick! I am wondering where you got those figures Jon? OK, I was extrapolating from a 1 Hp Bridgeport motor, which is rated at 3.3 A at 240 V. Obviously, there is an efficiency scaling factor I didn't take into account for larger motors. Look at this baby: http://goo.gl/QBuc1 100 HP motor by Baldor They say it takes 224 amps at 230v. And my guess is that it is wasting some of that, note the ducted fan on the back end, and all the fins for cooling that the fan is directing air over. That 20hp I'm talking about was pretty much conduction cooled. No fan on the back or fins. Its been a long time but I'd guess that 20 weighed 400+ lbs. Bottom line is its probably quieter than an Ajax, who carried the compact to extremes. The water/coolant pump was a 15hp, and we had 2, one a nice quiet GE motor, the other, same rated power but heavily fan cooled and its running noise level was 60 db louder than the GE. So when we needed to put seals etc in the GE, we busted a gut because OSHA would never have allowed us in the same room with that Ajax without some decent gun muffs. The ajax was strictly an emergency use only pump. I'd guess that Ajax weighed under 200 lbs, tiny, IMO too tiny. -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz It's fabulous! We haven't seen anything like it in the last half an hour! -- Macy's -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Curious toolholder
On Thursday, March 10, 2011 02:11:29 AM Frank Tkalcevic did opine: I got mine here... http://www.eccentricengineering.com.au/ I use it on a 9x20 I just CNCed. I accidently got the programming wrong turning 150mm diameter mild steel interrupted cut of 2mm depth, and it had no problem. There is a lot of overhang though and causes some movement with my AXA toolholder. It is also awkward to set up as a permanent CNC tool because the tool post needs to be rotated to get correct clearance. Those pix are a heck of a lot better than those on bay-com.com. Toolpost rigidity is something the 7x12 doesn't have if you put a GC post on kit, but the square block is fairly solid if there isn't a lot of tool sticking out. I have worked on the saddle fit, but its almost hopeless when the V is not true or symmetrical. It will be worn in about the time its worn out. :( I am tempted to see if the T6 will work for me. Thanks Frank. -Original Message- From: gene heskett [mailto:ghesk...@wdtv.com] Sent: Thursday, 10 March 2011 12:35 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Curious toolholder On Wednesday, March 09, 2011 08:33:49 PM dave did opine: On Wed, 2011-03-09 at 18:02 +, andy pugh wrote: Not such a bad idea... http://www.youtube.com/watch?v=xUAPrkC7Q- Qfeature=feedrec_grec_inde x Not so new. Been in the hobby world for years. Dave Now thats cute, where can I get one for 3/8 or 5/16 slotted toolposts as supplied with my puny little 7x12? -- -- -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz They are called computers simply because computation is the only significant job that has so far been given to them. -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz Mieux vaut tard que jamais! [ Better late than never ] -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Single Phase Lathe spindle motor question
On Thursday, March 10, 2011 02:21:13 AM Kirk Wallace did opine: On Thu, 2011-03-10 at 00:09 -0600, Igor Chudov wrote: ... snip Look at this baby: http://goo.gl/QBuc1 100 HP motor by Baldor They say it takes 224 amps at 230v. i This one is cheaper :) http://www.surpluscenter.com/item.asp?item=10-1977catname=electric but runs 460V. I think Gene needs one for his mill. ' Sure, it only weighs about 50x what my mill weighs. Even better: http://www.powerzoneequipment.com/inventory_item.asp?StockNo=53388Descr iption=1000+HP+Electric+Motor+-+Allis+Chalmers Short URL: http://alturl.com/ynqai Now we're getting definitely into the little blue pill stuff. Not to mention it would slowly descend through my 8 thick garage floor. -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) http://tinyurl.com/ddg5bz Knghtbrd I can think of lots of people who need USER=ID10T someplace! -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
