Re: [CAD_CAM_EDM_DRO] How do I 'make' a ballscrew antibacklash nut?

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

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> From: dspinnett <dspinnett@...>
>
> Hi all, I'm kind of a CNC newbie.
>
> I've converted my Grizzly G1006 to CNC (Master5/Mach1 and

Camtronics

> 4 axis servo), but the backlash and lead accuracy stink.
>
> I understand I can get decent/cheap screws (.004/ft) from

McMaster-

> Carr, and use a pair of taper or angular contact bearings

for the

> drive end.
>
> What I don't quite get is, how do you make a

'anti-backlash' nut

> from two regular ball screw nuts? how do you connect them

to the

> mills existing mount (two screws)... I've read about

using a spring

> to pre-load, but I cant visualize how that works.