I measured several rotations of the Z-axis lead screw on my Sherline
4400 CNC lathe.
The BACKLASH setting is 0.0035
I started with a move in the + direction that was at least 2x the
backlash clearing I saw earlier.
> G90
and then a sequence of 35
> G1 Z +0.0050 F6
reading the digital dial indicator after each move.
All the readings were within 0.0005, the limit of the dial indicator. I
can post the readings if anyone is interested.
The Z-axis lead screw does not seem to be a problem.
Then, I measured the cut where I first noticed the backlash problem.
> G90
dial indicator +0.5080
> G1 Z -0.530 F6
dial indicator -0.0215
> G1 Z +0.530 F6
dial indicator +0.5080
> G1 Z -0.530 F6
dial indicator -0.0215
> G1 Z +0.530 F6
dial indicator +0.5080
Looks like the BACKLASH setting is good.
I just need to remember to allow sufficient movement to clear the backlash.
Tom Dean
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