On Fri, Jan 28, 2011 at 09:15:30AM +0000, andy pugh wrote:
> On 28 January 2011 04:24, Erik Christiansen <dva...@internode.on.net> wrote:
>
> > Is slack best taken up by carefully measuring existing slack, almost
> > making enough room for the thrust bearings, then skimming to fit?
> > (A shim is easier to trim to size, perhaps.)
>
> I am not entirely sure what you are asking.
>
> I ended up making a whole new version of the eccentric housing to
> accommodate the bearings, coupling and motor mount.
> The angular contact bearings were just clamped face-to-face with a
> preload shim between them.
Ah, that's just what I was puzzling over. How to remove the end-float in
a way that works, yet isn't horribly complicated. I figured that the
axial space in the eccentric housing has to either be a tight fit on the
length of the worm plus thrust bearings, or summat that's adjustable or
inherently provides sufficient preload to avoid backlash has to be
squeezed in there as well.
Is it a Belville washer which provides (known) preload?
I'll disassemble the table. I had considered just replacing the
handwheel with a HTD pulley, and mounting the motor on a bracket held in
a T-slot, as recommended on an old thread, but that loses appeal, the
more I think about actually doing it.
> It wasn't a vast amount of work, I might have a drawing (an actual pen
> sketch) somewhere.
Ah, if it surfaces, and a scanner is conveniently close to hand, it'd be
interesting to see, but your ideas on how best to take up the slack are
most valuable.
Erik
--
I have not failed. I've just found 10,000 ways that won't work.
-- Thomas Edison
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