Re: [CAD_CAM_EDM_DRO] Re: please help........

"If you don't want to deal with machining the
ballscrew end then
perhaps you could find a bearing with an ID that
matches the major
diameter of the ballscrew and fashion a mount"

thats a great idea. i should have thought of that.

thanks very much sir, as that is what i will do
--- caudlet <tom@...> wrote:

> --- In CAD_CAM_EDM_DRO@y..., dazedNconfused
> <tattoos4unme@y...> wrote:
> > by capturing the far end of the screw, i assume
> you
> > mean with a mounted bearing of some sort. as i
> just
> > stated, its not machined an that end.
> >
> Indeed. The loose end will tend to flail about and
> vibrate at
> different lenghts and rpm's. There are some physics
> formulas that
> describe the oscillation of an object supported at
> one end. The
> frequency of vibration would be a factor of length
> (the amount
> sticking out past the ballscrew) and the energy
> applied as rotary
> movement. Needless to say, heavy undamped
> vibrations are rough on
> the equipment and play heck with accuracy.
>
> If you don't want to deal with machining the
> ballscrew end then
> perhaps you could find a bearing with an ID that
> matches the major
> diameter of the ballscrew and fashion a mount. You
> could get by
> without a keeper nut if you made sure the mount
> captures the bearing.
>
> I just cut and modified three 7 ft 1" Warner
> ballscrews I scavaged
> off of some equipment. I machined them to match the
> original ends so
> I could use the same bearings, mounts and keeper
> nuts. Even cut down
> they were over 68" so several feet were sticking out
> of the lathe
> headstock. I had to build a support to keep them
> from whipping
> around during machining. Carbide tools, lubrication
> and slow cutting
> are the secret.
>
> On one of them I had to remove the ballnut and of
> course the hundred
> or so tiny ball bearings. Putting that all back
> together was a
> painstaking job.
>
>
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