Re: [Emc-users] Spindle speed changes with threading.

On 02/05/2021 01:11 PM, johnd wrote: What's the resolution of your spindle encoder and base period servo period? There is no base thread on this servo system. The servo thread runs at 1 KHz. The spindle encoder uses the bull gear in the mill's head, so it has 324 counts/rev. Jon

Re: [Emc-users] Spindle speed changes with threading.

On 02/05/2021 11:03 AM, John Dammeyer wrote: Hi Gene, But it's also been reported that with LinuxCNC it's possible to stop the spindle while still in Threading Mode and then turn the spindle by hand and the carriage will follow. This is of course on a lathe. Not something you'd do on a mill

Re: [Emc-users] Spindle speed changes with threading.

On 02/05/2021 10:07 AM, Gene Heskett wrote: You have my curiosity bump itching Jon, When I get my stuff back together on the GO704, and get my new 'scope unpacked, I'll take a look at the step drive output and answer that itch. You actually should be able to check this out with Halscope. Look

Re: [Emc-users] Spindle speed changes with threading.

On 02/05/2021 03:15 AM, Gene Heskett wrote: On Friday 05 February 2021 02:57:38 John Dammeyer wrote: Granted this subject is a bit old I've now had some time to dive back into the TI F2837xD which has dual processors and other features that will make it a good test bed for trying out stuff. It

Re: [Emc-users] EDM from scratch

On 01/31/2021 07:22 PM, John Dammeyer wrote: I found some of the earlier articles in Home Shop Machinist Issue's May/June 1995 and September/October 1995. I do not have part 2 published in July/August 1995. However, in the 3rd part Robert Langlois describes the stepper motor operation in co

Re: [Emc-users] EDM from scratch

On 01/31/2021 07:28 AM, andy pugh wrote: I have started to play around with EDM. The intention is to make an EDM "grinder" to profile tool steel and possibly carbide cutting tools using CNC-turned profiles. A fancy commercial (and patented) EDM system was described by a tech who worked on them

Re: [Emc-users] EDM from scratch

On 01/31/2021 07:28 AM, andy pugh wrote: I have started to play around with EDM. The intention is to make an EDM "grinder" to profile tool steel and possibly carbide cutting tools using CNC-turned profiles. I think that it shows promise, but only partly works. I am using a 50R resistor and a

Re: [Emc-users] Fanuc Servos?

On 01/27/2021 11:35 AM, Todd Zuercher wrote: How useable are Fanuc's servos and amps with Linuxcnc? My understanding is that it is very involved to try to force them to work with anything other than a Fanuc control I make converters for the two most common types of Fanuc encoders used on brus

Re: [Emc-users] Rpi Pico

On 01/21/2021 10:02 AM, Matthew Herd wrote: Agreed. It looks promising, but no more so than a "Blue Pill" or similar boards. Also, what voltages does it operate on? I wasn’t able to find that in the literature but I didn’t dig into their documentation that deeply. 3.3 - 5 V. That WAS in th

Re: [Emc-users] Rpi Pico

On 01/21/2021 02:43 AM, Sven Wesley wrote: For you people out there who use an Arduino or RPi to communicate with parts of the machine (tool changers, doors etc). Here's a cute and really low priced alternative. https://www.raspberrypi.org/products/raspberry-pi-pico/ The blurb is pretty sketchy

Re: [Emc-users] Spindle speed changes with threading.

On 01/18/2021 05:47 PM, John Dammeyer wrote: So what does LinuxCNC do? Is the thread mucked up if spindle speed is changed during a feed hold and then start? Feed hold has nothing to do with it John, you can't change the spindle speed in mid thread. Full stop. Period. I think it could do what

Re: [Emc-users] Spindle speed changes with threading.

On 01/18/2021 05:05 PM, John Dammeyer wrote: Quick question about threading with LinuxCNC. If you do a feed hold between passes for cutting a thread and during that feed hold change the spindle speed what will happen? No problem. At the beginning of EACH pass, the spindle encoder is zeroe

Re: [Emc-users] Rpi 3b+ to 7i90hd

On 01/13/2021 10:40 AM, Ralph Stirling wrote: I played around with sd on my RPi after I got things going with the USB flash. After dd copying the same image to the sd card, booting the pi successfully, and killing power, I never got a successful second boot. I would have to mount the sd card on

Re: [Emc-users] Rpi 3b+ to 7i90hd

On 01/12/2021 10:48 PM, Thaddeus Waldner wrote: I’m wondering what you plan to use for flash memory on the Pi. Is the SD card a viable solution in this application? Would the Pi compute module with onboard flash memory be a workable solution? One issue with onboard flash memory is that swappin

Re: [Emc-users] two requests

On 01/10/2021 01:49 PM, Gene Heskett wrote: And I find when trying to add it, that the mesa version doesn't have that. So I need a way to set the pid.n.maxoutput to do the same thing but subtract the amount idb uses. How does that math work with as pwmgen scale of 46, and I can't recall the rea

Re: [Emc-users] two requests

On 01/10/2021 12:27 PM, Gene Heskett wrote: On Sunday 10 January 2021 11:38:42 Jon Elson wrote: On 01/10/2021 01:36 AM, Gene Heskett wrote: On Saturday 09 January 2021 20:57:24 Jon Elson wrote: On 01/09/2021 06:39 PM, Gene Heskett wrote: Yes so idb drives it closer by overdriving it an

Re: [Emc-users] two requests

On 01/10/2021 01:36 AM, Gene Heskett wrote: On Saturday 09 January 2021 20:57:24 Jon Elson wrote: On 01/09/2021 06:39 PM, Gene Heskett wrote: Yes so idb drives it closer by overdriving it an "amount" so that the friction locked point is closer to the desired point without going

Re: [Emc-users] two requests

On 01/09/2021 06:39 PM, Gene Heskett wrote: Yes so idb drives it closer by overdriving it an "amount" so that the friction locked point is closer to the desired point without going over. The trick is to null the error without changing the sign of the error. If the sign changes, then it oscillate

Re: [Emc-users] two requests

On 01/09/2021 11:19 AM, Gene Heskett wrote: One last thing I would like to do, is output a zero to the pwmgen if the error is less that a tolerance thereby shutting down the motor entirely. Isn't that what the deadband parameter into the PID does? Jon

Re: [Emc-users] two requests

On 01/07/2021 02:24 PM, Gene Heskett wrote: copy pasted from the anderswallin site it had a bunch of python stuff in the paste that didn't show in the onscreen box, so I removed it. Whats left is attached. This is an HTML corruption , in<0.0 should probably be replaced by in < 0.0 and so

Re: [Emc-users] two requests

On 01/07/2021 09:57 AM, Gene Heskett wrote: Greetings all; Prowling thru the wiki. looking for hints on writing thread milling gcode, I note that the only example is for a 3/4" mill, and not commented well enough I could easily adapt it to cut 6mm threads with the mills I just ordered. Has anyo

Re: [Emc-users] Bed isn't flat on my 6040.

On 01/06/2021 06:07 PM, Gene Heskett wrote: Never heard of Canode till now. Msg marked, thanks Jon Every shop supplier has the Dy-Kem, but few stock Canode. So, it is a bit harder to get. But, well worth it to keep the entire shop and all your clothes from turning blue. Jon ___

Re: [Emc-users] Bed isn't flat on my 6040.

On 01/06/2021 04:30 PM, Gene Heskett wrote: On Wednesday 06 January 2021 06:08:23 andy pugh wrote: How far out of true is it? A good mm in some of the places I have checked. But now I need to stay at or below .1mm over a foot of travel for this box mod. I could reclamp it, and survey it with m

Re: [Emc-users] I wonder if I can fix it?

On 01/05/2021 06:05 PM, John Dammeyer wrote: Interesting. One could do an experiment. Cut a cup the size of the gear but without the teeth. Then mount it and run an offset skateboard wheel inside it to flex it about the amount the gear would flex. Count revolutions and let it go. How many

Re: [Emc-users] Chinese VFDs with good reputations

On 12/26/2020 11:44 AM, Dave Cole wrote: What low cost Chinese drives have you guys used with great success? I have a Magnetek (made by Yaskawa) GPD333 on my Bridgeport mill. I think it is designed for single-phase operation. It is a 1 HP drive on a 21 HP motor, so not derated. I do put a

Re: [Emc-users] cnc lathe retrofit

On 12/26/2020 10:47 AM, Gene Heskett wrote: Two additional questions. That 70 ohm 300 watt braking resistor just walked up and rang my doorbell, so are you using one? and if so what settings mods have you made in the VFD? Mine has several settings. There is a minimum frequency, below which it

Re: [Emc-users] Season's greetings

On 12/25/2020 07:30 PM, Jon Elson wrote: Stuart, I hope you and your family have managed to avoid the virus and are doing well. We mostly have, but Daniel did get the "Covid toes" about April. Ugh, sorry, I had intended that message to go DIRECTLY to Stuart, not to the l

[Emc-users] Season's greetings

Stuart, I hope you and your family have managed to avoid the virus and are doing well. We mostly have, but Daniel did get the "Covid toes" about April. Matthias has been a police officer in Topeka for about a year now, so not that far from you. I've attached a writeup on what has been going

Re: [Emc-users] Merry Christmas

On 12/25/2020 08:29 AM, Thomas J Powderly wrote: Merry Christmas to all Best wishes for the New Year Yes! I appreciate all the hard work all the developers do for the continued progress of LinuxCNC. So many other open source projects wither on the vine, but LinuxCNC has continued to be impro

Re: [Emc-users] Checking vfd hookup question?

On 12/24/2020 11:43 AM, Dave Cole wrote: Automation Direct sells braking resistors. https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/vfd_accessories/braking_units_-a-_resistors Looks like the cheapest one is about $30. I've used

Re: [Emc-users] Checking vfd hookup question?

On 12/24/2020 02:18 AM, Chris Albertson wrote: "All the time?"When you have a hard requirement like this is when some detailed engineering can pay off.Assume you are reversing at 50% duty cycle and burning 1KW 50% of the time. Where I live this can cost 12 cents per hour. This is $89 p

Re: [Emc-users] Checking vfd hookup question?

On 12/23/2020 06:55 PM, andrew beck wrote: Just to tag in. I need a braking resistor for my cnc mill spindle it's a 7.5kw vfd. Needs to rigid tap all the time etc Any ideas? I like the idea of a stove element.. Just need to know some values etc Get the 11" stove elements. A 2400 W element

Re: [Emc-users] Checking vfd hookup question?

On 12/22/2020 06:30 PM, Matthew Herd wrote: In my research on resistor sizing, I heard reports that Haas uses stove elements for their braking resistors. On factory machines, no less. Of course that’s second hand, so I can’t say it’s true. Yes, absolutely. Our Haas at work has a stovetop e

Re: [Emc-users] Interface Simodrive 611 ?

On 12/21/2020 01:00 PM, Dave Cole wrote: I have worked on Siemens controls and drives for years. It depends on how old your Simodrive is. Do you have a Simodrive 611U or an earlier 611 drive? They had some really old drives in the early 90s that were also called 611's but they were not like the

Re: [Emc-users] Interface Simodrive 611 ?

On 12/19/2020 06:39 PM, Gene Heskett wrote: That's a good enough reason, Jon and gets LinuxCNC in the door, opening up that customer by upping, maybe even doubling his productivity in parts per hour. He has got to like that. If he is willing to learn how to use the improved coding LCNC makes pos

Re: [Emc-users] Interface Simodrive 611 ?

On 12/19/2020 04:32 PM, Gene Heskett wrote: I did a look-see with giggle and a few hits down from the first, says its being phased out, meaning since its now a decade old, support will vanish shortly. So I'd not put it in any new upgrades or conversions. Not to mention its pricey, wy pricey.

[Emc-users] Interface Simodrive 611 ?

Has anyone interfaced a Simodrive 611 servo system? I did find the manual online, but there is a LOT of info, and it is not really easy to follow. I see it has several analog inputs, so I'm thinking that the traditional scheme, CNC control sends analog velocity command to drive, drive receiv

Re: [Emc-users] Spindle + MDI (Was: I wonder...)

On 12/15/2020 03:43 PM, andy pugh wrote: The first time I tried it, I got what I expected, then I tried again and now it gives the wrong behaviour every time. So at least I have a system to try debugging on. BTW, using a PC and Axis 2.7.14 (still with the MESA) it exhibits the same issue. Whi

Re: [Emc-users] Question Regarding Selective Assignments in HAL

On 12/14/2020 10:37 AM, Matthew Herd wrote: Thanks Andy, I’ll play with HAL today and see what happens. Jon, you’re using the motion pins (spindle.0.x) while the "Spindle" component also has the same naming format and some of the same names. It took me awhile to sort it out. Depends on th

Re: [Emc-users] Question Regarding Selective Assignments in HAL

On 12/14/2020 10:19 AM, andy pugh wrote: On Mon, 14 Dec 2020 at 16:15, Jon Elson wrote: Well, interesting. Now, where does spindle come from? In my configs, I have signals like : spindle.0.forward and spindle.0.speed-out But, there is no loadrt spindle command anywhere. This is rather

Re: [Emc-users] Question Regarding Selective Assignments in HAL

On 12/14/2020 09:03 AM, Matthew Herd wrote: I’ve had a chance to do some reading. In particular, I’ve been contemplating Jon’s approach and the spindle component. The manual is very interesting because the spindle component seems to include most of the functionality I need. I was wondering

Re: [Emc-users] Beaglebone and MachineKit

On 12/13/2020 08:47 PM, Gene Heskett wrote: And I will say not to the degree you might think. Right. LinuxCNC has added some things like HAL that cause increased overhead (probably no worse than 10%). The ONE big thing that eats up resources is the 3D graphical preview. There are GUIs that

Re: [Emc-users] Beaglebone and MachineKit

On 12/13/2020 03:15 AM, Robert Murphy wrote: The reason for the switch from MK to Linuxcnc, the Linuxcnc project just has a better feel, IMHO, and the forum appears to have more members that use it in a commercial setting. I'm not saying that the former statement is gospel. Yes, MachineKit

Re: [Emc-users] Question Regarding Selective Assignments in HAL

On 12/12/2020 08:12 PM, Matthew Herd wrote: Which raises the question of how the inputs and outputs will be enumerated for the second board. Will the second board inputs enumerate as ppmc.00.din.16.in through ppmc.din.31.in and the outputs as ppmc.00.dout.08.out through ppmc.00.dout.15.out

Re: [Emc-users] Question Regarding Selective Assignments in HAL

On 12/12/2020 08:12 PM, Matthew Herd wrote: Jon, I have two USC boards on the same parallel port. I think there is a bit of a clarity issue in the documentation here: http://www.linuxcnc.org/docs/html/drivers/pico-ppmc.html . The loa

Re: [Emc-users] Raspberry Pi LinuxCNC 2.8 question.

On 12/12/2020 06:01 PM, Gene Heskett wrote: Simple, works 100% of the time if you can type. I've never ever found a file manager that actually gets it right OOTB. I think theres an unwritten rule that it won't. Why muck around with a file manager? Except for the swiss army knife called mc, mos

Re: [Emc-users] Raspberry Pi LinuxCNC 2.8 question.

On 12/12/2020 03:41 PM, John Dammeyer wrote: From: Nicklas SB Karlsson [mailto:nk@nksb.online] To make a link to a file "ln -s filename filename", read manual page "man ln", I always create the link in the wrong direction first time. Oh gawd, that would mean using the command line. How antiqu

Re: [Emc-users] Raspberry Pi LinuxCNC 2.8 question.

On 12/12/2020 02:40 PM, Nicklas SB Karlsson wrote: To make a link to a file "ln -s filename filename", read manual page "man ln", I always create the link in the wrong direction first time. Yes, me too! It is just totally Unix-like that the parameters are reversed depending on if it is an ln

Re: [Emc-users] Beaglebone and MachineKit

On 12/12/2020 01:38 PM, marcus.bow...@visible.eclipse.co.uk wrote: John (or anyone else), Is there a 'cape' currently available to suit the Beaglebone Black running MachineKit or LinuxCNC? I know there used to be a cape specifically for that purpose, but it has been out of production for some

Re: [Emc-users] Question Regarding Selective Assignments in HAL

On 12/12/2020 08:12 AM, Matthew Herd wrote: Hi All, I’m sure there’s a simple answer for my question, but I haven’t been able to figure it out. Currently the configuration for the spindle forward and reverse outputs is as follows: # connect spindle fwd/rev to I/O controller net SpindleFwd <=

Re: [Emc-users] fixed A offset problem

On 12/11/2020 06:35 PM, Gene Heskett wrote: Greetings all; In playing some more with this servo, I am in the +-10% of right for the SCALE, getting that somewhere near right also lowered the Pgain from 30 to around 2000, but demanded an FF1 of about 17.6. But after homing, which in this case

Re: [Emc-users] I wonder...

On 12/11/2020 05:50 PM, John Dammeyer wrote: I just used the Pi4 LinuxCNC version to do some simple slotting. All done with the MDI. Should really have done the G-Code but it was a one of test thing. It's there that I realized yet again that something between the capability of the Pendant

Re: [Emc-users] I wonder...

On 12/11/2020 11:30 AM, John Dammeyer wrote: My Delta Bandsaw is from 1939. I power it up, cut a piece of wood and turn it off. It's a tool. Sometimes I think we lose sight of the fact that the mills and lathes running CNC are also tools with more than a life of the latest newest OS or Com

Re: [Emc-users] I wonder...

On 12/11/2020 03:03 AM, andy pugh wrote: https://hackaday.com/2020/12/10/a-xilinx-zynq-linux-fpga-board-for-under-20-the-windfall-of-decommissioned-crypto-mining/ So an ARM core and an FPGA on one board? I wonder if one could put LinuxCNC on the ARM and Hostmot2 on the FPGA? Well, they may no

Re: [Emc-users] Tuning a servo

On 12/08/2020 10:53 PM, Gene Heskett wrote: What does that 22mv mean in folllowing error since I have that set for about half an inch at the moment? It is not milli VOLTS, it is milli-units. Generally inches or mm, depending on your preference. so 22m means 0.022" assuming that's what you use.

Re: [Emc-users] [was Spindle indexing] now rigid tapping help

On 12/07/2020 03:54 PM, Gene Heskett wrote: On Monday 07 December 2020 12:16:35 Jon Elson wrote: And a/o about 13:30 local, I am alone again. My Dee has passed. So sorry to hear that! Jon ___ Emc-users mailing list Emc-users@lists.sourceforge.net

Re: [Emc-users] Mesa Tacho Generator?

On 12/07/2020 01:45 PM, andy pugh wrote: On Mon, 7 Dec 2020 at 19:42, Todd Zuercher wrote: Mostly, I was hoping to avoid the thread delays of having to go through hal adding 1-2 more thread cycles to the "staleness" of the data. (Encoder read/process to velocity, Hal read from Mesa, Hal pro

Re: [Emc-users] Mesa Tacho Generator?

On 12/07/2020 11:49 AM, John Dammeyer wrote: Googling L290 with Counter or Quadrature doesn't yield anything. Got any more details? I had no trouble finding it immediately. But, here's a link : https://www.digchip.com/datasheets/parts/datasheet/456/L290-pdf.php Jon _

Re: [Emc-users] Mesa Tacho Generator?

On 12/07/2020 11:44 AM, Chris Albertson wrote: Really? "As much as you want"? It is not hard at all to build a device that works at the mechanical limits of an encoder but "as much as you want" could be a lot more than what is possible. There is going to be quantitation noise of the speed.

Re: [Emc-users] Mesa Tacho Generator?

On 12/07/2020 08:47 AM, Todd Zuercher wrote: Is it possible to set up a firmware for a Mesa FPGA that could read the encoder velocity from an encoder input and output that velocity as an analog command directly to an analog output (hopefully at faster than the servo thread rate) in order to by

Re: [Emc-users] [was Spindle indexing] now rigid tapping help

On 12/07/2020 06:17 AM, Gene Heskett wrote: But it may take a bit, my wife has reached the end stage of her COPD. Hours, maybe a day or so left. I was invited to come and visit yesterday despite the covid lock down. And I'll go back today. Sorry to hear that, very sad. Hang in there, and maybe

Re: [Emc-users] [was Spindle indexing] now rigid tapping help

On 12/07/2020 05:19 AM, andy pugh wrote: On Mon, 7 Dec 2020 at 11:13, Gene Heskett wrote: Now comes the improvement request for two more pins into motion. I need a pin to disable the backlash move, until the spindle has actually stopped. Are you sure that isn't what already happens? (I guess

Re: [Emc-users] [was Spindle indexing] now rigid tapping help

On 12/07/2020 05:11 AM, Gene Heskett wrote: Just one problem. I've not measured it, but I believe the backlash move may be done the instant motion issues the reversal, so it takes place during the spindle slowdown as its still spinning fwd. This results in the resultant thread being cut sloppy as

Re: [Emc-users] Spindle indexing

On 12/05/2020 11:41 PM, John Dammeyer wrote: What I was wondering is if LinuxCNC, with a suitable Servo Motor or high res encoder on the spindle can treat it like a 4th axis on a mill. I believe some people have done this. One of the issues is how to gracefully change LinuxCNC from a spindl

Re: [Emc-users] Servo Amp Documentation?

On 12/05/2020 04:49 PM, Karl Schmidt wrote: Most electrical hardware problems turn out to be connectors. Yes, I can verify this. I've just resurrected a vintage-2000 pick and place machine. I had to reseat a whole bunch of connectors, and even reseat many socketed ICs (they used a bunch o

Re: [Emc-users] Installing LCNC on Raspberrypi 3B+

On 11/27/2020 12:53 PM, John Dammeyer wrote: I just put the brain dead LinuxCNC distribution onto an SD card. Then booted and pulled the ini and hal files from the PC into the proper folder. BDI (Brain Dead Install)? But, that's a 20 year old system, X-86 only, and it would be hard to find h

Re: [Emc-users] G10 L2 question?

On 11/20/2020 07:40 AM, Gene Heskett wrote: Greetings all; I am rewriting my holefinder routine. I would like to know if a G10 L2 axis's R P1 is exactly the same as doing a touch off by mouse for system G54? Except for the added R of course. On the 6040, I have also worked out a 2 pins in paral

Re: [Emc-users] couple Q's on PID's

On 11/18/2020 09:03 AM, Gene Heskett wrote: I have apparently damaged the encoders output stages, and hooking its leads up to the bobs inputs results in the rising edge of the signal looking like its charging a large capacitance. Falling edge is fine. Quadrature is excellent. Perhaps the enco

Re: [Emc-users] linuxcnc board with good epp port

On 11/15/2020 04:48 PM, dave engvall wrote: HI, With *B*lack Friday on/coming I need a recommendation for a motherboard that has good latency and a rock solid EPP port. Servo application so that should relieve some of the constraints. It needs to work with Jon's upwm and Peter's 7i34. Natura

Re: [Emc-users] back to a bad cable?

On 11/13/2020 10:14 AM, Gene Heskett wrote: Greetings all; I, despite seeingthe signals on the bobs input leds just fine, am not seeing them at all the inputs to encoder.01 in the 5i25. And I just made that 5' cable a month ago. IDC crap. I have a 100 ft roll of Belden ribbon cable thats now a

Re: [Emc-users] anti-freeze recommendation for water cooled spindle motors

On 11/07/2020 05:34 PM, Gene Heskett wrote: Greetings all; I have just found that food grade antifreeze in the water seems to be a nono for long term useage as motor coolant. Why do you need food grade in a recirculating system? How about plain old antifreeze, which has lubes and anti-corrosi

Re: [Emc-users] limit switch configuration on lathe in linxcnc (2.7)

On 11/06/2020 09:08 PM, R C wrote: ok... but, if I turn the lathe an computer off.. then restart them and want to home the lathe.. it wouldn't know how to do that unless it hit a limit switch? Yes, the limit switch can be set up to also be taken as the home switch. But, you need som

Re: [Emc-users] limit switch configuration on lathe in linxcnc (2.7)

On 11/06/2020 07:33 PM, R C wrote: I noticed I can (in stepconf, which I shouldn't use of course...) That I can use the limit switches as 'home' for an axis only. Unless I am understanding this wrong, I figured an axis would travel there and when it hits it thinks "I am home" ? T

Re: [Emc-users] how to control lathe spindle with a mesa 7i77 card

On 11/02/2020 03:31 AM, andrew beck wrote: Thanks Jon. I am controlling a 1988 fanuc velocity spindle drive. And no Idea about isolation. Not keen to try it lol. Really I just want a isolated 0-10v virtual pot like the Mesa 7i76 has. Otherwise I might daisy chain in a 7i76 just for the spind

Re: [Emc-users] how to control lathe spindle with a mesa 7i77 card

On 11/01/2020 12:46 PM, Ed wrote: On 11/1/20 10:30 AM, andy pugh wrote: On Sun, 1 Nov 2020 at 04:43, andrew beck wrote: On a 7i76 the 0_10v is isolated from the Mesa card I think. Is a 7i77 similar? I just a bit cagy about connecting up electrically to the VFD inputs. As I don't want to

Re: [Emc-users] EPP

On 11/01/2020 10:18 AM, andy pugh wrote: First off I have no idea if the SIIG board works and indeed no idea of how to test it. If it shows up in lspci as a parallel port card that's a good start. Does it have a Moschip chip? Those generally work. SIIG parallel ports used to be my universal E

Re: [Emc-users] I am STILL not getting G2/G3

On 10/31/2020 03:46 PM, Gene Heskett wrote: Yes Jon, r1 does not equal r2. Gawd I wish that error window was copy/pastable. The code straight out of counterbore.py has exactly the same error. Is there a newer version of it? Where? I never use IJ arcs, but only R arcs. Saves me a LOT of hea

Re: [Emc-users] I am STILL not getting G2/G3

On 10/31/2020 12:01 PM, Gene Heskett wrote: G0 Z4.2500 (clear fixtures etc) (works) G0 X0. Y-0.0700 (pre-position to start a G3 move) (works) (spiral down in relative, so just step z down in additive mode) G91 (relative distance mode) G3 X0. Y-0.0700 Z-0.0250 J0.0700 (dies here) OK, you

Re: [Emc-users] driver for a DC motor for a BS-1.

On 10/26/2020 06:48 PM, Gene Heskett wrote: But the switching losses in the olimex board, even at only a 1 kilohertz pwm are killers, getting it hot enough to burn a finger in just 2 or 3 seconds. So, I need a d2a to drive one of the 150 watt class D audio boards after shorting the inputs hi-p

Re: [Emc-users] driver for a DC motor for a BS-1.

On Monday 26 October 2020 14:16:55 Chris Albertson wrote: 20% PWM duty cycle and a 24V power supply is about 4.8 volts to the motor. Many DC motors will not move at 20% of rated volts. I'd not be surprised if it took 10 or 12 volts to overcome internal friction. A standard test for servo mo

Re: [Emc-users] driver for a DC motor for a BS-1.

On 10/20/2020 03:19 PM, John Dammeyer wrote: I looked at their web site. (google KB Electronic DC drive). Seems like pretty nice stuff although I wonder if they would react fast enough to a closed loop control. If that was even wanted. One of the drives does support tachometer feedback.

Re: [Emc-users] driver for a DC motor for a BS-1.

On 10/20/2020 03:04 PM, Dave Cole wrote: What about using a common KB Electronics DC drive? Woot.com (Amazon discount site) is selling one for $89. I think they can commonly be found on Note that these drives are NOT isolated from the mains. Anything that doesn't provide isolation for the co

Re: [Emc-users] OT: Fanuc 0M setup

On 10/20/2020 02:29 AM, Roland Jollivet wrote: Also, if I want to ditch the controller at a later stage, are the Fanuc servo drives interfaceable to EMC? Can you say what servo amps you have? The oldest Fanuc had standard analog velocity servos, but instead of a DC tachometer, they synthesize

Re: [Emc-users] question for Chris and Thaddeus

On 10/18/2020 12:07 PM, John Dammeyer wrote: From: Jon Elson [mailto:el...@pico-systems.com] I thought all servo motors did it that way. I can see they could also remove the PWM from the windings completely for 0 power but if there's even the slightest bit of load on the motor the c

Re: [Emc-users] question for Chris and Thaddeus

On 10/18/2020 03:57 AM, Chris Albertson wrote: The above is not the way it works. No one would design anything like that. But let's say you did. What would happen? The motor would vibrate and slowly rotate and have close to zero torque The Geckodrives G-320 series, for one, does this. A number

Re: [Emc-users] for Jon

On 10/17/2020 06:21 PM, Gene Heskett wrote: This is a rail to rail, meaning about a 5.11 volts peak to peak nice square wave, with its bottom sitting on the ground rail. Can I feed that without any further treatment, into the + terminal, pin 2 of your pwm-servo? Or at 5 volts, do I need a prote

Re: [Emc-users] question for Chris and Thaddeus

On 10/16/2020 12:06 PM, Gene Heskett wrote: But, given fast enough switching fets, can this disadvantage not be addressed with a combo of near the high limit for pwm frequency, and a suitable, non-saturating toroid in series with the motor? Yes, that is what I do with my PWM servo amplifiers.

Re: [Emc-users] question for Chris and Thaddeus

On 10/15/2020 09:49 PM, John Dammeyer wrote: The theory is that if the PWM signal is high the H-Bridge is switched to say turn the motor clockwise. If the PWM signal is low the H-Bridge is switch to turn the motor counter clockwise. Therefore with 50% the motor is first asked to turn one way

Re: [Emc-users] CAD for parts to make on a lathe

On 09/17/2020 03:37 AM, peterjohnhodg...@gmail.com wrote: I used to use Fusion 360 but they stopped my free licence when they looked at my website and found I did some ‘job shopping’ _regardless of turn over_. I wasn’t prepared to pay the $50 per month so I lost all my Fusion drawings. Be c

Re: [Emc-users] False mesages at lcnc launch

On 09/15/2020 08:40 AM, Gene Heskett wrote: Axis X Fault Axis Z Fault Axis X Fault Axis Z Fault Note that a lot of drives present the fault signal when disabled. I have had to build a module to "cover" that signal when not enabled so that LinuxCNC can be brought out of E-stop. Jon _

Re: [Emc-users] ot: welders

On 09/14/2020 10:42 AM, grumpy--- via Emc-users wrote: i'm retired just look'n to weld steel at home a stick welder for about 20 years i was attached at the hip to a lincoln stovepipe i've tried a couple of the cheap inverters and they are better than noth'n just barely i know have'n a motor-g

Re: [Emc-users] Mini-PC

On 09/11/2020 10:40 AM, Eric Keller wrote: On Thu, Sep 10, 2020 at 7:49 PM Gene Heskett wrote: On Thursday 10 September 2020 18:32:41 Eric Keller wrote: Gene, do you have pictures of your sheldon? Yes, I've posted some to the list so they s/b in the archive. Yell if you can't find them. T

Re: [Emc-users] cnc axis "Touch Off"

On 09/10/2020 08:28 PM, R C wrote: I figured out the "touch off", and that it 'works' the same as homing, functionally. I wondered what all the different coordinate systems are for, their differnces. (I know what a coordinat system is, mathematician here.) This allows you to set up an offse

Re: [Emc-users] cnc axis "Touch Off"

On 09/10/2020 05:59 PM, R C wrote: I was just playing with it a bit, I have the idea, that , like homing is done per axis, "touching Off" is done per axis too? Yes, you should be able to select the axis that is to have its offset changed and then enter what that coordinate should be set to.

Re: [Emc-users] Another possibly silly Q for Peter or Andy.

On 09/09/2020 12:16 PM, Gene Heskett wrote: On Wednesday 09 September 2020 12:38:43 Jon Elson wrote: On 09/09/2020 11:08 AM, Gene Heskett wrote: Is it possible to get an enable signal, per axis, from the mesa cards that would become true, hopefully a couple micky-secs ahead of the first

Re: [Emc-users] Another possibly silly Q for Peter or Andy.

On 09/09/2020 11:08 AM, Gene Heskett wrote: Is it possible to get an enable signal, per axis, from the mesa cards that would become true, hopefully a couple micky-secs ahead of the first stepper pulse so no missed steps would normally occur, losing its home, and go back false when the last step h

Re: [Emc-users] Cutter compensation

On 09/07/2020 03:24 PM, Leonardo Marsaglia wrote: Is it any advantage in using cutter compensation when programming the g-code using CAM? Because since I've started working with CAM for my turning programs I like to let the software do all the compensation. By the way, I'm talking only about lath

Re: [Emc-users] Interesting GUI

On Fri, Sep 4, 2020 at 1:05 PM Chris Albertson wrote: On Fri, Sep 4, 2020 at 9:50 AM Mark Wendt wrote: On Fri, Sep 4, 2020 at 12:41 PM Chris Albertson < albertson.ch...@gmail.com wrote ...So, to make LinuxCNC nearly universal, hide it inside a product that is slick and easy to install an

Re: [Emc-users] logan lathe for sale

On 09/03/2020 07:53 PM, Stuart Stevenson wrote: A buyer's premium has been around for a long time. Until a couple years ago it seems as if the premium was hardly ever above 10%. Now it varies between 10% and 20% with 18% as the most prevalent. Lately, they have been adding a hammer premium that s

Re: [Emc-users] logan lathe for sale

On 09/03/2020 01:58 PM, Stuart Stevenson wrote: Heh - tax on hammer of 6.25% and an 18% buyers premium equals a basic 25% surcharge. They need to talk to some government or cell phone company wonks to find a few more various and sundry names for extra charges. Pretty soon the charges will be more

<    1   2   3   4   5   6   7   8   9   10   >