Int 412 shuts off on rapid Z axis travel

[Jurek]

Int 412 shuts off on rapid Z axis /M06 or M25/command. No mechanical drag on the Z movement. I have checked ball screw and rotate it by hand / when machine completly shut down/ Swap drive cards to /Z and X/. It shows error on the screen /Gross positioning error B/ It has Heidenhain 151P or Q. Ithink servo motor for Z bad ! Any suggestion. Thanks Jurek

[RMARCH]

Sounds like it is the " Z " Motor. Send it to clarkson Company in Chicago for a rebuild. They are the best.

[gus]

If you are getting a gross positioning error only in rapid, I would think the servo just needs to be tweeked.

[Jurek]

Thank You guys for good suggestion . One brush in Z motor had a broken spring / poor contact/ the opposite was getting hot and control was shutting machine. Set of new brushes from Clarkson did the trick. She is running again. Thanks Jurek.

[RMARCH]

Originally Posted by Jurek Thank You guys for good suggestion . One brush in Z motor had a broken spring / poor contact/ the opposite was getting hot and control was shutting machine. Set of new brushes from Clarkson did the trick. She is running again. Thanks Jurek.

Glad to hear you have it running again !! I know how it is to have one of your machines Down. If you do a lot of peck drilling you should check and change your brushes often. Brushes are a lot cheaper than a rebuilt Motor.