Hello,
I have a CNC grinding machine with a Fagor 8025 GP control, Indramat Drives and Power supply, Heidenhein linear scales and Inramat servo motors with encoders. (It is a dual loop system).
The machine is 20 years old and saw heavy usage grinding parts to .00005" (half a tenth)
A couple of months ago we noticed the machine was not repeating on the x axis. The machine said it was at location but the diameter varied +/-.0001" and then it gradually increased to +/- .0004. Also at position the servo kept hunting for position moving a tenth or two back and forth.
This is what we have done so far:
Sent linear scale out for cleaning and testing. Had it professionally installed back into machine.
Sent CNC control to Fagor for testing...no problems found
Sent Ball Screw out for rework
Replaced Indramat drive
Sent Servo Motor out for testing it's ok (zero backlash coupling)
Every component on x axis has been tested or reworked except the thrust bearing. Mechanic said it was OK?
At the end of the line here and many sleepless nights.....any ideas?
GP
I have a CNC grinding machine with a Fagor 8025 GP control, Indramat Drives and Power supply, Heidenhein linear scales and Inramat servo motors with encoders. (It is a dual loop system).
The machine is 20 years old and saw heavy usage grinding parts to .00005" (half a tenth)
A couple of months ago we noticed the machine was not repeating on the x axis. The machine said it was at location but the diameter varied +/-.0001" and then it gradually increased to +/- .0004. Also at position the servo kept hunting for position moving a tenth or two back and forth.
This is what we have done so far:
Sent linear scale out for cleaning and testing. Had it professionally installed back into machine.
Sent CNC control to Fagor for testing...no problems found
Sent Ball Screw out for rework
Replaced Indramat drive
Sent Servo Motor out for testing it's ok (zero backlash coupling)
Every component on x axis has been tested or reworked except the thrust bearing. Mechanic said it was OK?
At the end of the line here and many sleepless nights.....any ideas?
GP