Re: [ATM] Polishing Machine Shaft size

[Jarvis Krumbein <jkoptic@juno.com>]

Bill, take yourself to the nearest junk yard and see if you can find the
rear axle from a 3/4 ton truck.  The wheel hub and axle housing (cut off
so that only the flange and maybe an inch of the housing remain of the
axle leaving the entire rear hub assembly intact) make a very robust
bearing and shaft assembly.  I've used these both for machines and for a
very healthy polar axis.  Almost any make of truck will do as they all
use the same hub outside the axle housing arrangement.  My own most
recent was a Ford F250.  I got the axle and had the yard cut off both
complete hub assemblies with thier cutting torch for $50.  If this is of
interest and you would like more info including pictures, please let me
know and I will supply the info off list.

Jarvis Krumbein  jkoptic@juno.com

On Thu, 25 Oct 2007 14:04:17 -0700 (PDT) William Marriott
<bmarriott@pacbell.net> writes:
> Hello;
> 
> So, I have decided to build a polisher for finishing
> my 20" RC primary.  The large Strasbaugh polisher I
> have at work that will accomodate 20" does not slow
> down enough (35rpm spindle and about the same
> eccentric) and the eccentric is linked to the same
> motor as the spindle.  Great for polishing out the
> grey, but not for final work.
> 
> I need to buy a couple of pillow block bearings, and
> was wondering about shaft diameter.  I was thinking
> about going with 1.5" diameter, but the machine is
> being built to accomodte maybe up to 30+ "s
> 
> I would think 1.5" diameter shaft would be stout
> enough, but have no real data to back that up.
> 
> Comments from machine builders or others?
> 
> TIA
> 
> Bill Marriott
> 
> Guitars and Stars, the best of two worlds
> http://HagstromWorld.com
> http://StarlightOptical.com
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> 
> 
 
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