Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: rmtucker on June 02, 2007, 05:23:22 PM
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I am having problems with mach2 and cv and i was just wondering if anybody could maybe advise.
My gantry router has been running for a couple of years and i run mach2 v7.5 (old i know but it has always worked).
Anyway i produced a file from artcam to engrave a coin (approx 21mm dia).
If i run the file and go back and check the z position it is .3 - .4mm out of position and always upover.
So i spent all day re-tuning the motors only to find that no-matter what accel i use the machine is alway out the above amount and alway upover.
So i sent the file to a friend that has mach and a milling machine,Now this mill is rock solid and never loses steps.
But sure enough whhen he runs it he is alway out .2mm - .3mm upover.
After much debate i turned the cv off and the machine never lost a step.
I have spent many hours discussing this problem with art over the years,We always seem to get the machine to run but every now and again a new file throws a spanner in the works.
Is there anything i could do in artcam to help,Or mach2?
Regards
Mark
www.weardalecnccarving.co.uk (http://www.weardalecnccarving.co.uk)
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I would Try Mach3 and see if you have the same problem... I think the enhanced pulsing could help you.
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Brian
I am already using enhanced pulseing.
The reason i stick to mach2 is because mach3 requires such a powerful computer,And i have never had problems in the past.
It just seems to be this application?
Also the friend that also tried to run the program is running mach3 lockdown.
regards
Mark
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I can test the file here on the servo mill that I have here as well :)
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Where to send the file?
It's a chopped version which only runs for 10 mins.
Regards
Mark
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Brett will test it and he can send it to me :)
He has a stepper mill
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Brian
I still need to put the file somewhere so you/brett can get it?
Regards
Mark
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Hey Mark, you can post here on the forum. If you don't know how, watch the welcome tutor, one of the top topics in the general disscusion board.
Brett
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Ok here is the chopped file.
Please run with cv turned on.
Regards
Mark
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Anybody had a chance to run the file?
Regards
Mark
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Will try and test it out on my mill tomorrow for you unless Brett has done so before.
Hood
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Woud you please test it :) You k now how Brett can get ;)
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Tested okay here ... Could you post your XML so I can see your settings?
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Sorry guys, I just got in. Going to test now.
Brett
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Hey Mark,
Have you allways had the x,y, and z axis rapid at once? I have had problems with that in the past. Feeding all three at once was fine but I can't rapid all three at once. It use to skip steps bad like that.
I'm still testing your file. I have to set up on a BOB rather than the Grex to test CV.
Brett
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Mark, try this code and see if you get the same results as the one you posted. It is the same file, I just seperated the rapids.
Still doing some test.
Brett
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Mark, I just ran your code with an indicator in the spindle. Even with all three axis rapiding at the same time, it retured to zero dead nuts. I Zeroed my axis and the indicator, ran the file. It sends it to 10 at the end. I hit go to z and it was perfect. How are you testing to see that it is getting out .3-.4 mm?
Brett
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Oh dear
Thanks for running the tests guys.
The only thing that is common to my machine and my friends machine are Gecko 210's,should they work in microstep mode x10 or can this cause problems?
Regards
Mark
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Chatoticone
Are they stepper motors you are using,are you using microsteps,did you use cv on?
I know this is not lack of power and def not noise as the program runs no problem without losing steps if i turn cv off.
Does microstepping affect cv?
If i went x5 on the gecko's would it help or hinder the problem?
Any input is appreciated.
Regards
Mark
www.weardalecnccarving.co.uk (http://www.weardalecnccarving.co.uk)
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Hey Mark,
Mine is a stepper machine, 10 microsteps, CV on. I'm not sure about the drives you have. I think some do have a problem with CV mode. You will have to Google gecko drives and read up on them. I use the 201s. I have heard nothing but good things about the new 203Vs.
Brett
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Ran it no problem here, have G202's which are 10 microstepping. I think I remember reading about the servo drives from Gecko that have the step pulse multiplier having similar problems but not the stepper drives, still worth doing a search though.
Hood
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Hi guys
Found this little gem after speaking to ART and John Prentice and doing my own little search.
http://finance.groups.yahoo.com/group/geckodrive/message/10642
This is exactly what my drive is displaying in that little engraving program.
I am sure a few people would be intersted in this that has bought any drive with the G901 in it.
I just don't understand why this information has not been widely available.
Needless to say i have ordered some opto couplers to replace the G901.
Regards
Mark
www.weardalecnccarving.co.uk (http://www.weardalecnccarving.co.uk)
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I think thats the same problem I saw written in this forum about the servo drive, didnt realise the G212 used step multipliers.
Glad that you have found your problem.
Hood