Re: [ATM] recommendation on azimuth bearing surface

[Dave Smith <smithersscope@yahoo.com>]

Hey Gil,
I have some 18 gauge steel flashing. I actually cut a
piece of this 35 od/31 id with tin snips and installed
it (without glueing it up). I was very disappointed
with the flexure at the contact point. I suppose if I
put laminate under it, that it would greatly improve
the performance. I did use this same flashing material
on my grinding table...disaster! The bearings cut
through it in less than 15 minutes. But again, that
was flashing on plywood. Just not tough enough.
I'll head to Home Despot and see what's available at
what price. The steel will certainly make the
groundring heavier, but it's not a big concern for the
current design/implementation.

Thanks!
Dave
--- G Gagne <gagne41@clearwire.net> wrote:

> Dave Smith wrote:
> 
> >Now the question. I need to put a surface on the
> >ground ring that will hold up to the abuse of the
> 40
> >to 50 pound OTA rotating in azimuth on three ball
> >bearings. A 35 inch OD, 31 inch ID, 1/8 inch thick
> >stainless steel donut will set me back $150 to
> $200.
> >
> > :o(
> >Alternatively, I could use a laminate or smooth
> >glassboard composite and route/machine it myself
> much
> >more inexpensively.
> >
> >
> >Dave
> >  
> >
> 50 lbs. on three ball bearings does not call for 1/8
> inch steel support
> - that's overkill. How about 18 gauge galvanized
> sheet metal that you
> can cut yourself. If appearance is more important,
> use stainless sheet 
> of the kind used in commercial kitchens and
> certainly available locally. 
> If the ground ring surface is not hardwood plywood,
> you might consider a 
> thin layer of countertop laminate beneath the steel
> surface. Glue it all
> together with contact cement.
> Gil Gagne
> Port Orange, FL
> 
> 



 
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