3 axis dual drive, drift problem!!!

[antonzedd]

I got an aluminum profile (rails) 3 axis dual drive cnc (x2 motors on x). I'm getting about an 1/2" of drift on one of the sides, can't figure this out? Measure both sides, turn on controller enter DeskCNC load up a test file like smallsquare.nc and after I run it it seems fine?

I measure it and the drift starts out by being over 1 or 2mm on one side? Anybody know what this problem could be? Here is a link to the cnc I've got and all the parts I have:

http://www.pdjinc.com
http://www.pdjinc.com/parts.html

Any help would be appreciated, thanks.

[Tweakie]

It's a long shot but it could be a noise issue.
Check your grounding and earth connections.

Tweakie.

[antonzedd]

I was thinking more along the lines of a bad driver? I've checked all the drivers
seems as though the Left X motor is not holding enough torque, plus there's a weird high pitch faint squeal only on that motor. Its definitely the driver. CRAP!!

Delays, delays, delays!

[altonj2008]

Hi Anton, I'm Alton. I must say that I have always admired the machines on pdjinc. Your welcome pdj. They are clearly no nonsense and simple. And nice looking. I did notice though, that the wires that they sell are not shielded. I bought a used cnc router with Deskcnc and it has the same type wires. The wires are not shielded. This may be the cause. I am losing steps and basically having the same issue as you. As for you, I would think that pdjinc should be able to help you with this matter. Though, they may refer you to Deskcnc. If you solve your problem, I would be greatful if you could share it with me. And likewise, if I solve mine, I will do the same. I have tested my machine slowly and thoroughly and still losing steps. It runs very smooth. I added the line PULSEWIDTH=20 to the Controller section of the config file. This helped a little. Your settings may or may not allow this setting. I would recommend reading further about this at http://www.imsrv.com/discus/messages...tml?1113032192 and http://www.imsrv.com/discus/messages...tml?1135809262. My next step will be shielding all of the cables and grounding the machine frame and control box enclosure. Why take chances? Best of luck. Alton

[altonj2008]

Anton, I feel silly. I did not see your last post from 12-13-2009 before I replied. Anyway, if you or anyone else has any suggestions for me, I will be grateful. Thanks