Re: CNC Precision on a Sherline - additional info

This is the method I used to make the adjustments:

1st I moved the axis forward .01 (to make sure backlash was taken
up). Next I moved (in the same direction) .5 watching the
micrometer. I continued moving forward as far as I could, making
adjustments to the units/inch setting. When I ran out of room I
backed up and started over again. I repeated the same with the DI
except I moved steps of .01 (because of the limits to the DI.

Once everything moved forward at the requested increments I adjusted
backlash. I moved forward .01 to take it out, reset the micrometer
to 0, moved forward another .01 then back .01; the difference I used
as initial backlash. For really accurate backlash I used the DI and
worked down to step sizes of .001 until the DI moved by the
programmed increments.

If there is a better way to make this adjustment; I'm all ears.

--- In CAD_CAM_EDM_DRO@y..., "mszollar" <kenargo@v...> wrote:
> Question; I was calibrating my Sherline mill motor
travel/backlash,
> etc for my CNC machine. When I was through I noticed that I
needed
> 8080 steps per inch (x and y) and 7950 SPI for Z. Is the axis
screw
> that inaccurate?
>
> I measured with a micrometer and a dial indicator; both show the
> same results.
>
> Thanks,
> Ken