Following Error in one direction only all 3 axis

[Marty_Escarcega]

I have been working with Brian L. on his Milltronics Partner IV knee mill with Centurion V control. He is getting following error trips in ONE direction only on all 3 axis. I believe its the -direction on all 3. We are scratching our heads trying to figure out what is causing it. We pulled the timing belt of the X axis and tested the machine. (decoupled the ballscrew) following error seemed to be fine both directions. We manually turned the ballscrew and there was an ever so slight difference in resistance moving it back and forth. We don't think its enough to cause an issue.

We could see a weak servo amp or encoder if it was on one axis but all 3?
He has to run at 60 IPM or so, not to trip the machine. This machine is far more capable than that. Any ideas?? He has posted pictures in this forum. It has Fenner drives, I think they were 1270's (going from memory)

Any help to get this resolved and the machine running as it is supposed would be greatly appreciated. If money needs to be invested, we want to know that it is in the right places.

We HAVE followed the manual to set up and make sure the Servo Amps are adjusted properly. The computer has ACROLOC cards, though we aren't 100% certain which ones. Maybe one of you familiar with them might recognize them from Brian's photos.

Thanks in advance for the help!
Marty

[Al_The_Man]

If these are analogue input drives, do the test that I mentioned here, this will individually test the drive, motor and tach if it has one.
http://www.cnczone.com/forums/fadal/...awayyyy-2.html
Al.

[Marty_Escarcega]

Originally Posted by Al_The_Man If these are analogue input drives, do the test that I mentioned here, this will individually test the drive, motor and tach if it has one. http://www.cnczone.com/forums/fadal/...awayyyy-2.html Al.

Al, its Brian's machines, yes the the servo amplifiers are analog, they are Fenner. The Servos are SEM. Pics:

http://www.cnczone.com/forums/milltr...ng_info-2.html

Next time I am at Brian's I will try your procedure.
Marty

[Al_The_Man]

Job to keep track with all these separate posts going on
Al.