Re: [CAD_CAM_EDM_DRO] Threads on a ball screw........

Jack wrote:

>
>
>
> I have converted my minimill to ball screws but was having problems with
> shaft collars shifting causing backlash. The solution was to fit a nut
> to lock the collar in place. I had trouble with both my lathe and the
> hard material in turning the thread and spoiled the thread. The
> solution was to turn down the shaft in that area. Drill out and cut off
> a bolt to form a threaded sleeve. The sleeve is attached with sleeve
> retaining goop. Assuming the goop holds the sleeve this is a simple
> way to put threads on the ball screw and I plan on using the method in
> the future since it was quick and simple. I thought this might be of
> use to someone in the group.
>
> Jack
>

Actually, if you can machine closely enough, heating the threaded part
and cooling the ball screw will allow you to press the screw onto the
shaft. Shrink fits (like the one described) are VERY secure, they must
be machined off to remove them! And, no, I don't know what the
interference fit would have to be, but given the dimensions it should be
pretty easy to find out.

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David G. LeVine
12 Clairmoor Drive
Nashua, NH 03060