Bridgeport Vmc 500 Z axis problem

[kokpit11]

Hi all,

We bought Bridgeport VMC 500/16 machine and we have Z axis problem. Machine working property about 30 minutes and the problem appears randomly. We noticed that it happens most often when the Z axis is sliding down. She making whole in material and destroys head of the milling cutter. After that we have GROSS POSITIONING ERROR Z C (and number 6 on Z axis driver). Z axis brake is ok, but we think that he is disabled when machine is working and the Z axis driver has to stop Z axis but he couldn't. Speed regulation problem? Driver problem? we dont know.
Our system: Heidenhain
Z axis driver: 6SN1123-1AB00-0AA0
Z axis motor: 1FT5064-0AF71-1-Z-1

Has anyone had a similar problem?
Thank you for your answers.





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[Jim Dawson]

Maybe an encoder problem?

[kokpit11]

We changed 1FT5064-0AF71-1-Z-1 motor on the same from another machine. The same error.

[Jim Dawson]

Then must be the driver or encoder cable.

[kokpit11]

Then must be the driver or encoder cable.

Yes It was driver. I repaired him. IGBT module was ok but capacitors 150uF/400V were broken. I replaced them and everything is ok for now.

Thank You for help.

Special thanks to Jim Dawson.

[beemergb]

Hi there , did you cure your problem ? I have a Interact 720 with the same problem on Z axis .This problem I had on Y axis and found out it was the infrared encoder was defect , the couplung has broke , replaced it and all was well , I hope this is going to be this easy ! Good luck Harry , in Bielefeld Germany