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Mach2 Missed steps but not????
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I have a bit of a problem i was hoping someone could give some
insight to. i've just finished the table on my mini-mill conversion. I am running 870 oz in powerpac steppers. My problem is when there is a G00 (or a G01 with a feedrare > 15 ipm) the steppers go nuts. They sound like they are binding up and just sit there and make a horrible noise. THis only happens running Mach2 I just ran the same program in Mach1 and it ran perfectly. I can also jog the axis manually at 30 ipm or so with no problems. I have played with the motor tuning to no avail. Im running G201s at 50V. Any help will be greatly appreciated. Thank You Mike |
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Robin Szemeti
On Thursday 11 March 2004 06:41, kc8fws wrote:
My problem is when thereI had a similar experience on a machine .. I can jog the Z axis quite quickly, but in G01 or G00 moves, I have to set the accels MUCH slower and the max velocity down to ~1/3rd of what I can jog it at, because it just locks up. I put it down to rougher pulse timings in G00/G01, but who knows. I didn;t solve it, but I helped some by putting a few more volts on that motor. -- RapidCut CNC Technology CNC Plasma Cutter |
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same experience with Z lost steps. I had to lower the acceleration and max
speed at 1/2. I thought it was a mechanical resonance problem, but is always a bit strange to me because my Z was designed to support max speed and acceleration, as my X and Y axis. Perhaps it's a motor issue... don't know. i have no problems with X and Y axis, i can use them at max speed - acceleration. I will wait for the Gecko 2002 to see if it was a mach2 pulse timing problem. i'm using 75V on the steppers... Olivier. |
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Ted Gregorius
I've been running a production job on my mill using M2 vers 3.x for months with no problems
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Updated to 4.0 and played with some engraving stuff over the weekend and had some strange Z problems. Switched over to the production Job on Monday and destroyed a bunch of product. As the production job is a multiple slot and drill job I can't see any Z problems BUT I definetly have X & Y problems. I know the tunig is correct but I slowed it down and wreck another batch. I looked at it again this morning almost ready to put 3.x back on and I noticed that the CV mode was ON. I have never played with CV mode and I know it was not being used when I ran on 3.x. I switched to EXACT STOP mode and had my first succesful production run with 4.0. Houston, I think we have a problem. (or is that Cancun) Ted Gregorius (Pres) TAG Systems Racing Products, Inc. www.tagrace.com ----- Original Message -----
From: Digital audio Pro To: mach1mach2cnc@... Sent: Thursday, March 11, 2004 5:30 AM Subject: RE: [mach1mach2cnc] Mach2 Missed steps but not???? same experience with Z lost steps. I had to lower the acceleration and max speed at 1/2. I thought it was a mechanical resonance problem, but is always a bit strange to me because my Z was designed to support max speed and acceleration, as my X and Y axis. Perhaps it's a motor issue... don't know. i have no problems with X and Y axis, i can use them at max speed - acceleration. I will wait for the Gecko 2002 to see if it was a mach2 pulse timing problem. i'm using 75V on the steppers... Olivier. Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: mach1mach2cnc-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Ted. All this is strange. i got my problems engraving a complex font with a
V cutter and version 4.0a (lots of vertical small moves). The strange thing is the lost steps are not in the logical direction, i mean, with my Z spring setup, i should lost step in the + direction, but in the end of the cut the mill was too low, about 1 mm, that's a lot gained step, in the wroong direction. Normally the losts step should be in the + direction, because of the spring and the cutting forces. I was using constant velocity too, and didn't try exact stop because it would shake the table too much with my acceleration settings. The lowering of Speed and acceleration seemed to solve partially the problem, but i'm not sure he disapeared completely, because when i make a verify position, i always get high gained step values, 2 or 3 times higher than X or Y axis, and always in the same direction, this confirm it is not a reference sensor repeatability problem. Real mach2 problem or mechanical resonance.... ?? Anyone with similar strange gain steps on Z axis, - direction ? Olivier. |
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Ted Gregorius
Now that you point it out I agree that I gained steps in Z when doing the photo engraving. It seemd fine about two thrids of the way through and then started diving deeper and deeper on each pass.
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I was doing an XY engraving and it seemd that at one point each change in y drove the z deeper into the work. I've done a bunch of these before with 3.x and never saw this. I will retry this engraving tonight with CV mode off and see what happens. Ted Gregorius (Pres) TAG Systems Racing Products, Inc. www.tagrace.com ----- Original Message -----
From: Digital audio Pro To: mach1mach2cnc@... Sent: Thursday, March 11, 2004 11:01 AM Subject: RE: [mach1mach2cnc] Mach2 Missed steps but not???? Ted. All this is strange. i got my problems engraving a complex font with a V cutter and version 4.0a (lots of vertical small moves). The strange thing is the lost steps are not in the logical direction, i mean, with my Z spring setup, i should lost step in the + direction, but in the end of the cut the mill was too low, about 1 mm, that's a lot gained step, in the wroong direction. Normally the losts step should be in the + direction, because of the spring and the cutting forces. I was using constant velocity too, and didn't try exact stop because it would shake the table too much with my acceleration settings. The lowering of Speed and acceleration seemed to solve partially the problem, but i'm not sure he disapeared completely, because when i make a verify position, i always get high gained step values, 2 or 3 times higher than X or Y axis, and always in the same direction, this confirm it is not a reference sensor repeatability problem. Real mach2 problem or mechanical resonance.... ?? Anyone with similar strange gain steps on Z axis, - direction ? Olivier. ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: mach1mach2cnc-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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"Real mach2 problem or mechanical resonance.... ?? Anyone with similar
strange gain steps on Z axis, - direction ?" I had a problem with the Z two days ago. I lost steps in the other direction. At the end of the program, the tool was about .050 higher than it should have been. I was running identical parts in a fixture. I re-zeroed the machine and ran another 20+ parts with no problem. What ever is going on seems to be intermittent. Other seem to be having similar issues, so I don't think it's just us. Ross |
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Very interesting. In my font engraving, i gained steps progressively from
left to right, the first letters are ok, but progressively the others are too deep, and the last ones are 1 mm too deep. I cannot say if the Z gain appeared after each Y move. (the moves are too complex in a font engraving to see this. I don't understand how a mechanical resonance could cause this, because my miller is very strong, the cutted material is only plastic, and there is no vibrations (V cutter). Perhaps there is a small timing problem causing this. It should be interesting to rise the step signal timing higher than the default setting of 1 us, and or the direction signal higher than 0 us. Are you using gecko with stepers ? or servos ? Olivier. |
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Do you have servos or steppers ?
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Olivier. -----Message d'origine-----
De : rrc62_03782 [mailto:rrc62@...] Envoy¨¦ : jeudi 11 mars 2004 20:05 ? : mach1mach2cnc@... Objet : [mach1mach2cnc] Re: Mach2 Missed steps but not???? "Real mach2 problem or mechanical resonance.... ?? Anyone with similar strange gain steps on Z axis, - direction ?" I had a problem with the Z two days ago. I lost steps in the other direction. At the end of the program, the tool was about .050 higher than it should have been. I was running identical parts in a fixture. I re-zeroed the machine and ran another 20+ parts with no problem. What ever is going on seems to be intermittent. Other seem to be having similar issues, so I don't think it's just us. Ross Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: mach1mach2cnc-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. [Non-text portions of this message have been removed] |
Do you have servos or steppers ?I have 1000ozin steppers with Gecko 201's running 70 volts. I was only running at 60IPM, so I know the machijne wasn't even close to stalling. In fact, at 60IPM, it will bend the gantry if one of the lead screws stops. I was also using a V cutter. I was carving some oak shelf fronts with a nice design. The second part messed up. Every one after that was fine. I passed it off as a just one of those things that happens now and then, but now that I see others having similar issues, I think we may have a bug. I may seach my hard drives and see if I can find the V1.9 download. Not even sure if I still have it. That version ran flawlessly, but did not have some of the new CV and plasma features. Ross |
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Ted Gregorius
I'm a designer and have built my own controller using a Motorola MSP430F149 micro along with my own chopper drive circuit running my steppers. It has been working flawlessly with all previous versions of Art's software and I even ran it for a while on EMC (ouch, it hurts to remember that). I would think this wuold eliminate a Gecko related problem. My processor design is edge triggered so it does not care about pulse width.
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There is no vibration or mechanical problems that I can attribute to this. My production job is basically a drilling operation with 230 holes in plastic (5 modules on a pallet each requireing 46 holes). Pretty light duty for my system. I recently completed a 500 piece job (100 runs) using the 3.x version of MACH 2 without a single problem. BTW I have just completed the fifth run today using 4.0a with CV mode OFF and they are perfect. Can't wait to throw off my work hat and put on the hobby hat and try that engraving again tonight. I'ts my goal to make sure this machine never stops cutting somthing. Ted Gregorius (Pres) TAG Systems Racing Products, Inc. www.tagrace.com ----- Original Message -----
From: Digital audio Pro To: mach1mach2cnc@... Sent: Thursday, March 11, 2004 3:46 PM Subject: RE: [mach1mach2cnc] Re: Mach2 Missed steps but not???? Do you have servos or steppers ? Olivier. -----Message d'origine----- De : rrc62_03782 [mailto:rrc62@...] Envoy¨¦ : jeudi 11 mars 2004 20:05 ? : mach1mach2cnc@... Objet : [mach1mach2cnc] Re: Mach2 Missed steps but not???? "Real mach2 problem or mechanical resonance.... ?? Anyone with similar strange gain steps on Z axis, - direction ?" I had a problem with the Z two days ago. I lost steps in the other direction. At the end of the program, the tool was about .050 higher than it should have been. I was running identical parts in a fixture. I re-zeroed the machine and ran another 20+ parts with no problem. What ever is going on seems to be intermittent. Other seem to be having similar issues, so I don't think it's just us. Ross Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: mach1mach2cnc-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. [Non-text portions of this message have been removed] ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: mach1mach2cnc-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Art
Ted:
I think the memory problems in version 5.0 have been growing steadily. The problem, finally, was traced just before I left on vacation. It was a parsing engine problem within Microsofts linked list parser in the XML engine. After rewriting the offending code, memory usage dropped from 120Megs (at startup) to less than 64 on my machine. Each time the configuration was selected, anoth 20-30 megs would be used and not released till program end. As features were added they used more and more memory as the XML file grew. This causes some very weird errors, so the next version will be a trial lockdown version as I suspect it will cure some problems from as far back as the RC versions. This may alone solve may peoples recent troubles, but I will investigate from there. The new version should be out tommorrow night I think... Thanks, Art www.artofcnc.ca |
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