Re: Mill/Drill CNC Conversion

--- In CAD_CAM_EDM_DRO@y..., ccs@m... wrote:

>
> > I figure I'd start with non-preloaded nuts as they are

significantly

> > less expensive than the preloaded ones ($20 vs. $160.) In

my initial

> > test of my table I found no perceivable backlash, but that of

course

> > will change once loads are applied. I guess I'll cross the

backlash

> > bridge when I come to it.
>
> The preloaded nut I bought is really an assembly of two nuts.

If I

> had to do it again, I'd just buy two plain nuts. Dump the balls

out,

> grind two grooves in the end opposite the mounting threads of

each, on

> two opposite corners on each nut. Clean the nuts thorougly

and repack

> the balls. Then make up a short OD threaded tube to go

between them

> with male tabs to fit in the notches. Put some rings with set

screw

> lock on the threaded piece, and a stiff wavy washer type spring.

Use

> this to adjust the preload force...
>
> Chris Stratton

Good info Chris. Looking at the pictures, it did appear that they
were just two $23 nuts connected together with a magical $120
interface. However I wasn't sure how they kept the to from
rotating relative to each other under load.

Could you post or e-mail a drawing of what you are proposing?
I'm having trouble picturing the "short OD threaded tube" and
how it's used.

Great info, though. Thanks!