Newbie going nuttie

[rcpaisley]

This is probably something really simple!
I bought a used 2000 VMC 3016, just getting it running.

If I put a mag base indicator on the mill table with the indicator against a tool holder in the spindle.
Then jog the X axis until the indicator shows 0.100" movement,
the DRO on the machine says X has only moved 0.084"

This was really driving me nutty until I figured out what was happening!

Is there a scaling factor somewhere in the machine setup that I have to set?

Thanks,
Robert Paisley

[rcpaisley]

My machine has metric ballscrews and the inch ballscrew parameter was set.

Easy problems are better than the alternative!
Robert

[Mazakdude]

I've never seen as much as .016 difference between DRO and TIR due to backlash but it's easy enough to check and fix if thats your problem. I can't imagine that being your problem however on a machine as new as that unless it's been run REAL hard. I ran a 1996 model that had to have the thrust bearings replaced cuz the backlash couldn't be adjusted out of it. Just a thought.