Re: Re: backlash reduction

Robert Bachman wrote:

> From: Robert Bachman <bobach@...>
>
> Charles,
>
> Not all ballscrews used in milling machines are preloaded.
> Some mfg rely on backlash comp to do the job.

True, but these are ULTRA-precision ball screws, which
originally had error compensator cams that offset the encoder
to correct pitch errors. The screws, without the compensators,
are still accurate to about .001"/36". as best as I can measure it,
with only a .0001" DTI and a +/- .000050" gauge block set.
I don't know what the error would be if I hooked up the compensator
cams.

Jon