tesla500
Plastic
- Joined
- Nov 2, 2013
- Location
- Vancouver, BC
How much backlash is acceptable in ballscrews? I'm looking at a used Tree Journeyman 325 CNC, the X axis has essentially 0 backlash, the Z axis has 0.0005", but Y has about 0.002-0.003" depending on position. I think the thrust bearing is not pretensioned correctly and is contributing about 0.001-0.0015" of the total, based on indicating the end of the screw while jogging the axis. I didn't have time to figure out what backlash comp was set in the Dynapath 20 control, but judging based on how the screws turned when reversing, it's minimal, < 0.001"
The machine appears to be in good condition, ex-Boeing equipment. Asking price is $4300. Does this seem reasonable? Could the backlash be reduced by reballing it, or is it a more major repair to get the backlash out?
Cheers,
David
The machine appears to be in good condition, ex-Boeing equipment. Asking price is $4300. Does this seem reasonable? Could the backlash be reduced by reballing it, or is it a more major repair to get the backlash out?
Cheers,
David