Re: [Emc-users] Rapid Override
This is SF feature request #1536176 submitted in Aug 2006 http://sourceforge.net/tracker/index.php?func=detailaid=1536176group_id=6744atid=356744 As far as I can tell this is a useful feature and it should be possible to implement. I think right now all moves are queued up as canon-command with their programmed feed rate (be it 'feed' or 'rapid'). This would require a change so that rapid moves a flagged as rapid and the new rapid-override applied to those only in the traj planner. AW I want to have the rapid (G00) override separate from the federate (G01, etc) override. We use this on a first run when you want to cut at the programmed federate, and watch the rapid moves for collisions with the part, fixture or clamps. The procedure is one hand on the program stop button, one hand on the rapid override, one eye on the tool, one eye on the distance to go display. Every machine I have run has had a rapid override switch, usually 0, 25, 50 and 100% rapid speed. Are there 2 separate inputs into the motion controller that the slider is hooked to, or does the motion controller only have 1 feedrate override input? This may be getting deep into the EMC architecture, but I'm not shy. Thanks, Tony -Original Message- From: [EMAIL PROTECTED] [mailto:emc-users- [EMAIL PROTECTED] On Behalf Of Jon Elson Sent: Tuesday, April 08, 2008 9:10 PM To: [EMAIL PROTECTED]; Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Rapid Override Tony Bussan wrote: I have searched all over and cannot find any indication of how to implement rapid override with EMC. Can anyone point me where I should be looking? I'm not exactly sure what you mean by rapid overide. There is a feedrate override slider on TkEMC and Axis that affects BOTH cutting (G01) and non-cutting (G00) linear moves. G01 is at the programmed feedrate (F value) * the override. G00 is at the rate specified in the .ini setup file * the override. The override is disabled during threading cycles. Does any of that help? Jon - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/jav aone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Newbie Help Needed - Losing Steps
--- [EMAIL PROTECTED] wrote: From: Andrew Ayre [EMAIL PROTECTED] To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Newbie Help Needed - Losing Steps Date: Tue, 08 Apr 2008 18:08:58 -0700 Update - I switched to 1/4 stepping mode. Movement is smoother and quieter. The top speed of each axis is now limited by the speed of the real time system on my PC, with no stalls. Thanks for the help. :) Andy A while back I posted a pic of full step torque that was made for a project in India. It showed full step torque drop to near zero at resonant frequencies. Glad to hear that the microstepping took care of the problem for you. You can probably tune the loops in EMC and HAL to boost high speed performance if you need more than you've got. Rayh - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Newbie Help Needed - Losing Steps
[EMAIL PROTECTED] wrote: --- [EMAIL PROTECTED] wrote: From: Andrew Ayre [EMAIL PROTECTED] To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Newbie Help Needed - Losing Steps Date: Tue, 08 Apr 2008 18:08:58 -0700 Update - I switched to 1/4 stepping mode. Movement is smoother and quieter. The top speed of each axis is now limited by the speed of the real time system on my PC, with no stalls. Thanks for the help. :) Andy A while back I posted a pic of full step torque that was made for a project in India. It showed full step torque drop to near zero at resonant frequencies. Glad to hear that the microstepping took care of the problem for you. You can probably tune the loops in EMC and HAL to boost high speed performance if you need more than you've got. Rayh Ray, learning how to tune loops sounds intriguing and perhaps interesting to play with, but it's probably well beyond my abilities. Is there a tutorial somewhere? The speeds I now get for X and Y is 71.4 IPM, which I think is fine for my small machine (18 x 12). I'm using a P4 1.6GHz, 512Mb RAM with Ubuntu Gutsy if anyone is interested. Andy -- Andy PGP Key ID: 0xDC1B5864 - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Newbie Help Needed - Losing Steps
Andrew, What did you do to switch to 1/4 step mode. Was it within EMC or something on your controller? Is there a FAQ? I'd like to try that. Thanks, Emory On Tue, Apr 8, 2008 at 8:08 PM, Andrew Ayre [EMAIL PROTECTED] wrote: John Kasunich wrote: Andrew Ayre wrote: [EMAIL PROTECTED] wrote: --- [EMAIL PROTECTED] wrote: From: John Kasunich [EMAIL PROTECTED] To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Newbie Help Needed - Losing Steps Date: Sun, 06 Apr 2008 19:46:09 -0400 Andrew Ayre wrote: Hi, I have a gantry style machine with three axis. The X and Y axis have the same motor and the same nut and lead screw on each). I am testing the machine using manually entered commands into AXIS such as: G01 F80 X1 G01 F80 X0 When manipulating one axis at a time (no cutting, just moving around) I have found that I lose steps at different feed rates for each axis. X - lose steps at 148 ipm Y - lose steps at 81 ipm All those calculations are for theoretical limits to the step rate. But the reason you are losing steps is much less theoretical. You are probably running out of torque. When step motors go faster, the amount of torque that they can produce drops. When the load needs more torque than the motor can make, you lose steps. It does seem odd that the X can go faster than Y. X has to move more weight (I assume that X is the gantry, and Y moves a much smaller weight across the gantry). But something is making Y require more torque than X, so Y loses steps first. Regards, John Kasunich It looks to me like Andy is using full step motion. Probably what is happening is that he's hitting resonant frequencies that are a bit different for each axis. The extra weight of X might even work to advantage to help it cross that zero torque spot. Rayh Hi Ray, yes I'm using full stepping. My next step was to switch to 1/4 or 1/8 microstepping. So could that actually help? I know that the speeds overall will be reduced of course. Micro-stepping will lower the theoretical speed, but as you've already calculated, the theoretical speed is pretty fast right now. On the good side, micro-stepping will mostly likely increase the torque somewhat, especially at certain speeds where full-stepping causes resonance and dramatically lowers torque. Regards, John Kasunich Update - I switched to 1/4 stepping mode. Movement is smoother and quieter. The top speed of each axis is now limited by the speed of the real time system on my PC, with no stalls. Thanks for the help. :) Andy -- Andy PGP Key ID: 0xDC1B5864 - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Emory Smith [EMAIL PROTECTED] Website: http://stratcat50.googlepages.com Band: http://defoliants.googlepages.com Blog: http://stratcat50.blogspot.com/ - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Newbie Help Needed - Losing Steps
Emory, I changed the jumpers on my HobbyCNC board. I then recalculated the number of steps to move one unit (one inch or one millimeter) then adjusted the INPUT_SCALE value in the EMC2 ini file to that amount. Basically going from full stepping to 1/4 stepping will quadruple the value for INPUT_SCALE, but if your lead screws are in inches and you are using EMC2 in mm, or vice versa, I would recalculate the INPUT_SCALE value from scratch to avoid any rounding problems. Andy Emory Smith wrote: Andrew, What did you do to switch to 1/4 step mode. Was it within EMC or something on your controller? Is there a FAQ? I'd like to try that. Thanks, Emory On Tue, Apr 8, 2008 at 8:08 PM, Andrew Ayre [EMAIL PROTECTED] wrote: John Kasunich wrote: Andrew Ayre wrote: [EMAIL PROTECTED] wrote: --- [EMAIL PROTECTED] wrote: From: John Kasunich [EMAIL PROTECTED] To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Newbie Help Needed - Losing Steps Date: Sun, 06 Apr 2008 19:46:09 -0400 Andrew Ayre wrote: Hi, I have a gantry style machine with three axis. The X and Y axis have the same motor and the same nut and lead screw on each). I am testing the machine using manually entered commands into AXIS such as: G01 F80 X1 G01 F80 X0 When manipulating one axis at a time (no cutting, just moving around) I have found that I lose steps at different feed rates for each axis. X - lose steps at 148 ipm Y - lose steps at 81 ipm All those calculations are for theoretical limits to the step rate. But the reason you are losing steps is much less theoretical. You are probably running out of torque. When step motors go faster, the amount of torque that they can produce drops. When the load needs more torque than the motor can make, you lose steps. It does seem odd that the X can go faster than Y. X has to move more weight (I assume that X is the gantry, and Y moves a much smaller weight across the gantry). But something is making Y require more torque than X, so Y loses steps first. Regards, John Kasunich It looks to me like Andy is using full step motion. Probably what is happening is that he's hitting resonant frequencies that are a bit different for each axis. The extra weight of X might even work to advantage to help it cross that zero torque spot. Rayh Hi Ray, yes I'm using full stepping. My next step was to switch to 1/4 or 1/8 microstepping. So could that actually help? I know that the speeds overall will be reduced of course. Micro-stepping will lower the theoretical speed, but as you've already calculated, the theoretical speed is pretty fast right now. On the good side, micro-stepping will mostly likely increase the torque somewhat, especially at certain speeds where full-stepping causes resonance and dramatically lowers torque. Regards, John Kasunich Update - I switched to 1/4 stepping mode. Movement is smoother and quieter. The top speed of each axis is now limited by the speed of the real time system on my PC, with no stalls. Thanks for the help. :) Andy -- Andy PGP Key ID: 0xDC1B5864 - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Andy PGP Key ID: 0xDC1B5864 - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Newbie wants to find wizard
Hi EMC I am finally the proud owner of three Nema 34 stepper motors, stepper drivers and a power supply all wired up with power lights ablaze, ready to go. However EMC does not seem to be communicating with them. I get some weeere sounds but no movement. I see in the documentation there is a configuration wizard, but I can't for the life of me find it. Can someone help me out here please. All the best Aaron -- Powered by Outblaze - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Newbie wants to find wizard
you might want to try turning the feed override down to like 1%, with my little play i have with stepper motors, that's what they do when you try to run them too fast. I dont know where to find stepconf, you might try running it from command line? ive never used it. On Wed, Apr 9, 2008 at 5:56 PM, aaron Moore [EMAIL PROTECTED] wrote: Hi EMC I am finally the proud owner of three Nema 34 stepper motors, stepper drivers and a power supply all wired up with power lights ablaze, ready to go. However EMC does not seem to be communicating with them. I get some weeere sounds but no movement. I see in the documentation there is a configuration wizard, but I can't for the life of me find it. Can someone help me out here please. All the best Aaron -- Powered by Outblaze - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
