[Emc-users] Load cell
Hi, Has anyone considered the possibility of including load cells / strain gauges into the control loop of EMC2? What I am considering is an idea for making something which would require me to 'drill' a number of very small holes in precise positions through synthetic sapphire sheet. I could probably do it be making some form of sprung drill holder and using a rod or tube with diamond grinding paste to cut the hole but there would probably inevitably be some 'slop' in the sprung holder which would lead to inaccuracies in the finished holes (which would be maybe 0.1 - 0.2mm diameter). So, I was wondering if there might be a possibility to incorporate a load cell or strain gauges into the cutting head and provide some kind of feedback to EMC2 to regulate the downfeed on a 'peck drilling cycle' in a way similar to an EDM machine. If this hasn't been done already, I could envisage it being useful in other applications where it may be useful to optimise the cutting forces or provide some form of automated tool overload protection - such as if a drive belt fails? -- Best wishes, Ian Ian W. Wright Sheffield UK The difference between theory and practice is much smaller in theory than in practice... - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] sagcad user ?
hello Does anyone use sagcad and how is it? Will I need to install GCC compiler to install in Ubuntu 6.06 live install? I have acad r14 but no cam. looking for something to run in linux for EMC2 knee mill 3 axis Thanks Al __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] sagcad user ?
Date: Fri, 19 Oct 2007 06:56:14 -0700 From: [EMAIL PROTECTED] To: emc-users@lists.sourceforge.net Subject: [Emc-users] sagcad user ? hello Does anyone use sagcad and how is it? Will I need to install GCC compiler to install in Ubuntu 6.06 live install? I have acad r14 but no cam. looking for something to run in linux for EMC2 knee mill 3 axis Thanks Al Do you have r14 on Ubuntu? I've been trying to find out how to do that. _ Boo! Scare away worms, viruses and so much more! Try Windows Live OneCare! http://onecare.live.com/standard/en-us/purchase/trial.aspx?s_cid=wl_hotmailnews - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
John Kasunich wrote: Kirk Wallace wrote: Thanks for the e-mail Einar. There is a cabinet on each side of the lathe. The VFD is in the right cabinet and is grounded to the cabinet. A flex conduit with a plastic outer and a metal spiral inner carries three conductors to the motor connection box which is screwed to the motor housing. So, there should be metal surrounding the VFD to motor leads for the entire distance. There may be metal surrounding it, but that spiral has a lot of inductance and is not a good high frequency ground. If this is conduit and not cable, I'd pull the three wires out, then pull them back in with at least one ground wire added (three if you have room, one loosely twisted around each power wire). Connect the ground wire(s) directly to the motor housing, and directly to the VFDs ground terminal. The ground wires can be smaller than the power wires, especially if you have three. Even better, if you can get some, is a braid that can be expanded enough to run the three motor leads through it, then stretched lengthwise so it snugs down around the motor wires. Again, connect one end directly to the motor frame, and the other directly to the VFD ground. The idea here is to have the return path for stray currents as close as possible to the outgoing path. Regards, John Kasunich As a wild idea, would it work to use hydraulic hose as a conduit for this type of interference? If you skive back the rubber on the end before you crimp on the fitting it would give you a solid layer of wire braid and two fittings of your choice to run the wires through. Ed. - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Emc-users Digest, Vol 18, Issue 46
I have Bobcad 21 and agree the stick fonts are ugly. Now if I can just get them to stop calling me and wanting me to upgrade. Talk about high pressure sales. I'm interested in getting the fix if it is not something that I can d/l from bobcad. John On 19 Oct 2007 at 8:15, [EMAIL PROTECTED] wrote: Bobcad provides a stick font, but I thought it was ugly, and so reverse engineered the file format and made some adjustments. I haven't used it in a while, but it did work well. If you can prove your ownership of Bobcad, I could make the changes available. I can't just give it out to anybody, because it is copyrighted property of Bobcad. I only fixed about 4 letters that looked bad. Jon - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Load cell
On Sat, Oct 20, 2007 at 09:40:14AM +0100, Ian Wright wrote: Hi, So, I was wondering if there might be a possibility to incorporate a load cell or strain gauges into the cutting head and provide some kind of feedback to EMC2 to regulate the downfeed on a 'peck drilling cycle' in a way similar to an EDM machine. I can't tell if you're asking whether the software can do this, or whether anyone knows how to rig up the sensor. If you have the sensor and an input that you can get into HAL (through an ADC probably) EMC2 can use it to control the feed. You would hook the signal (after appropriate scaling/offsetting) to motion.adaptive-feed and then use M52 to turn on adaptive feed whenever you want it. The adaptive feed signal should swing from 1.0 (obey F word in the program) to 0.0 (stop altogether). http://www.linuxcnc.org/docs/devel/html/gcode_main.html#sec:M52:-Adaptive-Feed-Control - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
SNIP-- Using an oscilloscope, when I probed the power supplies with the spindle running, I got about .5 Volts of ripple that had a three stair step up and down appearance. Probing the +5 Volt differential signals I got a very short 10 Volt spike on the rising edge of each pulse, but otherwise they looked well formed. Without the differential boards, the +5 Volt encoder pulses had a more drawn out spike on the rising edge and the tops varied about a Volt above +5. The whole idea of the differential boards where to reduce the susceptibility of the system to noise, but the boards themselves seem to make the effect of the noise worse. Are your differential inputs terminated? If not, that would account for the spike... CAT5 has 100 Ohm charateristic impedance, so you need a 100 Ohm resistor across each A /A, B /B, X /X pair. Peter Wallace - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
On Sat, 20 Oct 2007, Peter C. Wallace wrote: Date: Sat, 20 Oct 2007 07:36:35 -0700 (PDT) From: Peter C. Wallace [EMAIL PROTECTED] Reply-To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Threading Hickups SNIP-- Using an oscilloscope, when I probed the power supplies with the spindle running, I got about .5 Volts of ripple that had a three stair step up and down appearance. Probing the +5 Volt differential signals I got a very short 10 Volt spike on the rising edge of each pulse, but otherwise they looked well formed. Without the differential boards, the +5 Volt encoder pulses had a more drawn out spike on the rising edge and the tops varied about a Volt above +5. The whole idea of the differential boards where to reduce the susceptibility of the system to noise, but the boards themselves seem to make the effect of the noise worse. Are your differential inputs terminated? If not, that would account for the spike... CAT5 has 100 Ohm charateristic impedance, so you need a 100 Ohm resistor across each A /A, B /B, X /X pair. Forgot to say that these resistors are on the _receiver_ end of the CAT5 cable... Peter Wallace - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] centering a lathe piece
Ahhh. If it's slightly off center, drilling the center hole will tend towards the center. Then, let the tailstock take up the slop. I know what you mean about light cuts. I've tightened up the bearings on the ... shaft that holds the chuck. When I make a heavy cut, it wants to push the shaft up, and I can sometimes see it in the cut as chatter. Thanks. Stuart Stevenson wrote: You don't say what your lathe is. Does it have a tailstock? If so, turn the end and leave about .010 (.020 on the diameter - .270) stock. Then use a combination center drill and countersink to drill a center hole for a center in the tailstock. Loosen the chuck and slide the part out of the chuck. Chuck the part with the minimum amount possible. Use the tailstock center to support the turned end with the shoulder. This will allow you to dial in the shaft for the entire length. When you have it dialed in then lightly machine the turned end to the diameter you want. Cut lightly. Take your time. The best would be a toolpost grinder. If your chuck doesn't have a tailstock find a lathe with a tailstock. thanks Stuart - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users begin:vcard fn:Brian Michalk n:Michalk;Brian adr:;;2204 Lockwood Cove;Austin;TX;78723;USA email;internet:[EMAIL PROTECTED] tel;home:512-928-1112 tel;cell:512-699-4037 x-mozilla-html:FALSE version:2.1 end:vcard - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] DC Motor and PID
I wanted to have a real motor/encoder system for my office EMC instead of using a simulated configuration. So, ruined a surplus printer to get the motor/encoder assembly, which I connected to an L298 and a +12 Volt motor supply. When I got to testing it, I had a hard time with tuning. On occasion, the motor would not move. I connected a voltmeter to the motor leads and found around a Volt going to the motor. Then I increased P until I got about 2.5 Volts and still no movement, so I helped it rotate, at which, it jumped to the commanded position and started oscillating. So, my thinking is, the the commutator configuration does not allow for a constant torque vs. voltage at every angle and the system friction is high enough to cause a stall at reasonable P values at certain start points. This seems like it might be a common problem for small systems where a torque/friction ratio might be fairly low. Or, is this more of a problem with inexpensive DC motors. This motor was designed to position paper to within a few thousandths of an inch plus traverse the length of the paper in about a second, so from my experience, the printer designers must have spent a fair amount of time with tuning. Do Etch-Servo setups have the same problem? -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Off Topic -- Centering a lathe piece
On Saturday 20 October 2007, Brian Michalk wrote: Follow rest ... Now why didn't I think of that. :-) Well, that's the first thing that came to my ancient mind. There are more ways to skin a cat than that I expect. Thanks, guys. Gene Heskett wrote: [...] -- 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) I never said all Democrats were saloonkeepers; what I said was all saloonkeepers were Democrats. - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Dual Screens
After a fair amount of grief, I got dual screens working on my office EMC computer. I started by adding a PCI card and monitor to the computer. As far as I could tell, Ubuntu has no display setup wizard other than the screen resolution dialog, so after making a backup, I changed /etc/X11/xorg.conf ( http://www.wallacecompany.com/machine_shop/xorg.conf ) directly with gedit, adding the xorg new text shown below. I also changed the; Section Screen/Identifier Default to Section Screen/Identifier Screen1 The biggest problem is in finding the real HorizSync, VertRefresh, Depth and Modes values. I have found that guessing these values is a waste of time and patience. Control/Alt F1 can be used to get to a command prompt when you lose a legible screen. Logging out or Control/Alt Backspace is supposed to reset X, but I found the only reliable way to invoke the latest xorg.conf settings was to reboot. One unexpected feature I have noticed is that you can't drag a window from one screen to the other. You need to open the application in the screen you want to use. So to have EMC running in the main screen and Halscope in the other, I had to open Terminal in screen two and invoke halscope from the terminal. I haven't done much beyond this and I am wondering how much of EMC can be displayed on the other screen. --- xorg new --- Section Device Identifier S3 Inc. 86c764/765 [Trio32/64/64V+] Driver s3 BusID PCI:0:19:0 EndSection Section Monitor Identifier Generic Monitor Option DPMS HorizSync 30-64 VertRefresh 50-100 EndSection Section Screen Identifier Screen2 Device S3 Inc. 86c764/765 [Trio32/64/64V+] Monitor Generic Monitor DefaultDepth16 SubSection Display Depth 8 Modes 800x600 720x400 680x510 640x480 EndSubSection SubSection Display Depth 16 Modes 800x600 720x400 680x510 640x480 EndSubSection EndSection Section ServerLayout Identifier Default Layout Screen 0 Screen1 Screen 1 Screen2 RightOf Screen1 InputDevice Generic Keyboard InputDevice Configured Mouse EndSection -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
On Sat, 2007-10-20 at 09:56 -0700, Peter C. Wallace wrote: On Sat, 20 Oct 2007, Kirk Wallace wrote: ... snip drain. I don't know its impedance, but I suppose I could start with 200 Ohms and work my way up. The data-sheet indicates that anything lower that 90 Ohms should not be used. I'll give it a try today. If you start at 200 Ohms, you need to work your way down... That is what I meant -- start at 200 and go towards 90. Thanks for clarifying it though. Shielded twisted pair is usually less than 100 Ohms impedance.. Termination need not be perfect, the overshoot is very roughly 1/2 of the impedance mis-match (20% mismatch = 10% overshoot) Open ended cables (no termination) will have 100% overshoot (likely the cause of your 10V spike) Peter Wallace -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
Kirk Wallace wrote: The whole idea of the differential boards where to reduce the susceptibility of the system to noise, but the boards themselves seem to make the effect of the noise worse. What are you using for the differential driver chip? Is it totem-pole output or open-collector? I think I need to place ferrite beads or other type of filter on the VFD inputs and outputs and then revisit the oscilloscope. I don't have much experience with tracking down noise with an oscilloscope, so if anyone has some words of wisdom, I would appreciate hearing them. This can be very difficult, as the power cord ground on the scope adds a guaranteed ground loop that can totally confuse the measurement. One way to know you are getting a ground loop through the scope's power plug is when you connect the ground clip of the scope probe to something, with nothing connected to the probe tip, but you see a signal! Anyway, the diff drivers seem to somehow be the problem. I can't even guess whether it is susceptibility to noise on the power input, noise coupling through the encoder signals, or just the fact that the diff. driver is an amplifier. If the drivers in the encoder are pretty slow, but the drivers in the diff. driver are really fast, then they could be turning a 50 ns glitch with very little amplitude into a strong pulse. I would guess that not only does the Z signal have this, but the A and B have it, too. The digital filtering of the quadrature signals have a defense that only valid quadrature transitions are accepted, but the Z doesn't have that. A filter might be the fix, or more intimate coupling/grounding/shielding between the encoder and diff driver may be the cure. If the encoder has one of those threaded military Cannon or Amphenol connectors with the 4 screws on it, you might make a little box that attaches to the encoder body between encoder and connector and put the diff driver in that. This should help prevent any interference getting into the signals between the two. If the encoder electronics are grounded to the encoder frame, opening this ground could be really helpful. That represents a classic ground loop situation. Don't put capacitors on the VFD output terminals. A series inductance can be helpful, but is not guaranteed to help. A line filter on the input is much more helpful, as capacitors can be used there. I am using a commercial line filter made by Filter Concepts, probably a Mil-spec unit, rated at 15 A, for my Bridgeport spindle. It is likely overkill, a 6 A unit would most likely handle the 1 Hp fine. I have no filtering, and no shielding, either, on the VFD output. I do have a ground wire in the 4-cond cable, tied to the VFD frame at one end, the machine frame at the other. The line input filter solved the noise issues I was having, with the computer monitor and my computer-controlled air compressor, which was only running off the same breaker panel. That line filter came out of my junk box, no idea what it came out of. Jon - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Off Topic -- Centering a lathe piece
On Sat, 2007-10-20 at 13:17 -0400, Gene Heskett wrote: On Saturday 20 October 2007, Brian Michalk wrote: Follow rest ... Now why didn't I think of that. :-) Well, that's the first thing that came to my ancient mind. There are more ways to skin a cat than that I expect. Thanks, guys. Gene Heskett wrote: [...] At my last formal job as a machinist, which before that was 15 years ago, I had a job which required using soft jaws. As basic an item as soft jaws are, I had never used them. So, I bolted the soft jaws to the chuck, and then got to thinking that I could not machine the jaws because they are loose in their slots. The supervisor was standing behind me, so I turned around and voiced my concern, at which he reached into his tool box and handed me a disk with three screws on the perimeter and said use this. The expression on his face alone was enough to make me embarrassed. In machining it seems there are a vast array of techniques that can only be acquired through, sometimes painful, experience. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Emc-users Digest, Vol 18, Issue 46
John Thornton wrote: I have Bobcad 21 and agree the stick fonts are ugly. Now if I can just get them to stop calling me and wanting me to upgrade. Talk about high pressure sales. I'm interested in getting the fix if it is not something that I can d/l from bobcad. Arrgh! I can find bits and pieces where I pulled out the 4 letters and edited them, but right now I can't even find Bobcad's font file. I did all this back in 1999, on Ver. 16.1 I have no idea whether they still use the same font technology, but it sounds like maybe they do. I will have to dig a bit, then maybe we can compare something about the files to see if what I have done is still compatible. Jon - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
Kirk Wallace wrote: My encoder disk problem cropped up again too. I am using a one inch U. S. Digital disk with a .466 inch hole and .500 inch shaft. There doesn't seem to be enough clamping area to keep the disk flat, so I have run the disk up towards the receiver end of the slot, so it rubs slightly in one spot, but works better. It seems that it might be best to buy the disk/hub assembly from USD. It might be better to buy a real encoder on eBay. I've always thought that the US digital stuff was just a little TOO low-budget. Jon - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Off Topic -- Centering a lathe piece
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Michalk Sent: Friday, October 19, 2007 3:41 PM To: Enhanced Machine Controller (EMC) Subject: [Emc-users] Off Topic -- Centering a lathe piece Is there an old trick to turning a part exactly on center? If this venue is not the right place, I would appreciate a pointer to an active group that could help me. I have 12mm precision round shafting. I need to turn down one end of it to .25 inches diameter. I have a four jaw chuck, and center to within .001, but when I hard couple a stepper motor to this part, it binds due to the .25 boss not being exactly on center. I do have a spider coupling, but would rather go direct due to the added size of the coupling. Is there some trick someone could enlighten me with? Hi Brian, Your probably need to do better than .001 TIR on the boss, but even when you get that good enough, not using a coupling will result in premature burn out of the stepper bearings. This is because the bearing have even smaller clearance, and the stepper motor parts might have a different TIR phasing from your part. I read somewhere that the Old Timers used two wrenches on a four jaw wrench, hand rotating the spindle by 90 degrees with both wrenches inserted. They would loosen one and tighten the other until they got the indicator dead on concentricity. So, go make yourself a second chuck wrench. 73, Don... - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] g-code generation
Hi Gene and Pat. . Ok - I got the photo to g-code program changed so it does not need a database. Believe me it was a real job. Got it to work with in-memory SQLite. Incidental that is the same DB that liberty-basic uses. So if I can figure out how to use LB and get pixel data from a photo, I'll convert to that. That way you should be able to run a simple executable. Maybe you or someone else knows if LB can get to photo pixels. Anyway you need to go to http://cnc.andbest.info/ And where it says to download - do another download of the zip file. You should be able to un-zip it into your directory called 'cnc' or any directory you want to call it for that matter. Then copy any photos you want into the sub-directory called 'photo' If you have Apache running you should be able to go to your favorite browser and enter the URL.: localhost/cnc/g_string.php Should be running!!! II put this out in kind of a rush so if it ain't working - let me know.. Good luck.. Have a great day.. Dan - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Dual Screens
You need to use the Xinerama extension to X for multiple combined displays. http://en.wikipedia.org/wiki/Xinerama http://tldp.org/HOWTO/Xinerama-HOWTO/index.html - XF86Config is xorg.conf you can definitely restart X with `sudo killall X` otherwise it looks like you have the right idea. On Sat, 20 Oct 2007, Kirk Wallace wrote: Logging out or Control/Alt Backspace is supposed to reset X, but I found the only reliable way to invoke the latest xorg.conf settings was to reboot. One unexpected feature I have noticed is that you can't drag a window from one screen to the other. You need to open the application in the screen you want to use. So to have EMC running in the main screen and Halscope in the other, I had to open Terminal in screen two and invoke halscope from the terminal. I haven't done much beyond this and I am wondering how much of EMC can be displayed on the other screen. - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] jog speeds
HI, What actually controls the jogging speed? - I'm sure I knew but my brain is in Estop just now When I start up Axis, the jogging speed sliders are at ridiculously high values and, if I forget to change them then the axes give up half way through a move losing my position. G0 works fine on all axes so I assume there is some other parameter that I am overlooking.. -- Best wishes, Ian Ian W. Wright Sheffield UK The difference between theory and practice is much smaller in theory than in practice... - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] jog speeds
I think it's this: your.ini [TRAJ] ... DEFAULT_VELOCITY = 0.xxx ... For me it seems to set the initial jog slider setting. Although, you should not be able to jog beyond operational limits if your other settings are correct. Such as: your.ini [TRAJ] ... MAX_VELOCITY = x.xxx ... and [AXIS_X] ... MAX_VELOCITY = x.xxx Early on, I found that my max acceleration defaults were a bit high, which also tripped a following error during jogs. On Sat, 2007-10-20 at 23:55 +0100, Ian Wright wrote: HI, What actually controls the jogging speed? - I'm sure I knew but my brain is in Estop just now When I start up Axis, the jogging speed sliders are at ridiculously high values and, if I forget to change them then the axes give up half way through a move losing my position. G0 works fine on all axes so I assume there is some other parameter that I am overlooking.. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] g-code generation
On Saturday 20 October 2007, Be Alert wrote: Hi Gene and Pat. . Ok - I got the photo to g-code program changed so it does not need a database. Believe me it was a real job. Got it to work with in-memory SQLite. Incidental that is the same DB that liberty-basic uses. So if I can figure out how to use LB and get pixel data from a photo, I'll convert to that. That way you should be able to run a simple executable. Maybe you or someone else knows if LB can get to photo pixels. Anyway you need to go to http://cnc.andbest.info/ And where it says to download - do another download of the zip file. You should be able to un-zip it into your directory called 'cnc' or any directory you want to call it for that matter. Then copy any photos you want into the sub-directory called 'photo' If you have Apache running you should be able to go to your favorite browser and enter the URL.: localhost/cnc/g_string.php Should be running!!! II put this out in kind of a rush so if it ain't working - let me know.. Good luck.. Have a great day.. Dan Thanks Dan, but it may be a week to 10 days before I can get to it, I have a daughter with cancer who isn't doing well I'm headed out to give her one last hug its about 1k miles one way to do that. And the miles get longer every year, so I don't look fwd to the drive. But I'll check it out when I get back. -- 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) Never test for an error condition you don't know how to handle. -- Steinbach - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] DC Motor and PID
On Sat, 2007-10-20 at 13:20 -0500, Jon Elson wrote: Kirk Wallace wrote: I wanted to have a real motor/encoder system for my office EMC instead ... snip You do not see this on good motors. You can check for this with either a variac- or electronically-controlled power supply that you can turn down to a fraction of a volt. Set the supply so the motor just rotates, at maybe 10 RPM. If it just stops somewhere, that motor either needs the commutator to be cleaned, or it has an open connection to the commutator. Jon I connected the motor to my lab supply and got the motor to turn very slowly at about 4.5 Volts. At the slowest speed, it would only stop if I reduced the voltage. So I guess I have a good motor and I just need to work more on the tuning. Maybe, add more P to get the initial voltage up to 4.5 but then add more D (?) to fight the oscillating. Well, I wanted a real world test bed, I guess I got it. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
On Sat, 2007-10-20 at 13:01 -0500, Jon Elson wrote: Kirk Wallace wrote: The whole idea of the differential boards where to reduce the susceptibility of the system to noise, but the boards themselves seem to make the effect of the noise worse. What are you using for the differential driver chip? Is it totem-pole output or open-collector? I am using the DS26C31 http://www.national.com/ds/DS/DS26C31M.pdf I think I need to place ferrite beads or other type of filter on the VFD inputs and outputs and then revisit the oscilloscope. I don't have much ...snip really helpful. That represents a classic ground loop situation. Don't put capacitors on the VFD output terminals. A series inductance can be helpful, but is not guaranteed to help. A line filter on the input is much more helpful, as capacitors can be used there. I am using a commercial line filter made by Filter Concepts, probably a Mil-spec unit, rated at 15 A, for my Bridgeport spindle. It is likely overkill, a 6 A unit would most likely handle the 1 Hp fine. I have no filtering, and no shielding, either, on the VFD output. I do have a ground wire in the 4-cond cable, tied to the VFD frame at one end, the machine frame at the other. The line input filter solved the noise issues I was having, with the computer monitor and my computer-controlled air compressor, which was only running off the same breaker panel. That line filter came out of my junk box, no idea what it came out of. Jon Is it something like this: http://www.eastek-intl.com/images/PreoSeriesER.pdf ? -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] DC Motor and PID
Kirk Wallace wrote: I connected the motor to my lab supply and got the motor to turn very slowly at about 4.5 Volts. At the slowest speed, it would only stop if I reduced the voltage. So I guess I have a good motor and I just need to work more on the tuning. Maybe, add more P to get the initial voltage up to 4.5 but then add more D (?) to fight the oscillating. Well, I wanted a real world test bed, I guess I got it. Right, you want P as high as possible, and to the point that you need some D to prevent oscillation. Unfortunately on the Pico Systems PWM system, there is no current loop or tach feedback, so the tuning is a little bit more touchy than with velocity servo amps. But, usually you can get the following error down to really negligable levels and still have a stable servo response. Too much D and the whole system gets quite unstable due to lags in the loop and the effects of quantization of the encoder. Once you have P and D up about as high as you can get them, you reduce the rest of the errors with FF1 and FF2. It doesn't take much of these factors to make quite a difference, and it is easy to go too far and make things worse. And, you need something like 1 - 2 encoder counts worth of deadband to stop the buzzing. Jon - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
Kirk Wallace wrote: On Sat, 2007-10-20 at 13:01 -0500, Jon Elson wrote: What are you using for the differential driver chip? Is it totem-pole output or open-collector? I am using the DS26C31 http://www.national.com/ds/DS/DS26C31M.pdf Oh, my, a blast from the dark ages! I've used a 75172 in some more recent equipment, but I really don't know if that has anything to do with the problem. Is it something like this: http://www.eastek-intl.com/images/PreoSeriesER.pdf Yes, that is certainly the sort of filter module I used on the VFD. Jon - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Generating stick-font toolpaths?
John Thornton wrote: Jon, Don't spend a lot of time trying to find this. I do it so rarely that if it is handy that would be cool if not that is ok too. Well, it appears my Bobcad font is GONE! I still have the 5 letters I redid, but the main font file seems to be gone. If I select the Bobcad font, it doesn't put any characters into the drawing. I just messed up my Windows disk image by attempting an upgrade, and had to rebuild everything. Since I can't find the default font file, I may have to reload it, if I can find the floppies or whatever it came on. I should have another copy of it at work. Jon - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
