Thanks Ray.
My work envelope at one shot is rarely over 6" anyway. Would that
justify .001 screws and anti-backlash? I'd like to be accurate over
6" within a couple thou if practical.
Final goal is to make mini running engines, and probably a full size
engine too. The 'Griz' doesn't seem too bad overall - better quality
that the lathe anyway. (both are brand new).
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--- In CAD_CAM_EDM_DRO@y..., "Raymond Heckert" <jnr@a...> wrote:
Ball screws are practically anti-backlash, nevertheless,
FYO, you'd basically put the two nuts back-to-back, and
screw them together, until they almost 'bind'. now you have
a backlash-free nut. Of course, you wouldn't really mount
them back-to-back, you'd mount each 'back' to either side
of a mounting plate, and use spring washers to 'pre-load'
the screws, allowing some 'give' under severe pressures,
instead of making it a 'hard' mechanical back-to-back
interface. With a Grizzly, and 0.004"/ft screws, I'd not
bother with the antibacklash, as 'machine slop' coupled
with the 0.004"/ft will be the real test for your system.
'Less'n, of course, you're looking for some REAL accurate
work.
RayHex
