RE: ATM Re: Glass Balls

[Don Clement <dclement@littlefeet-inc.com>]

Hello Vance,

I have seen rock spheres made using a section of cast iron pipe mounted
vertically on a turntable. The rock or glass sphere is first roughly cut to
a sphere. Then the rock held by hand, to the rotating pipe and ground with
abrasives. It is the same process as mirror making, but with a much smaller
ROC. Polish using felt on the cast iron and CO or rouge. One could also use
pitch for better accuracy. 


Don Clement
San Diego/Running Springs
The Clement focuser (patent pending)


> -----Original Message-----
> From: vburnham@juno.com [mailto:vburnham@juno.com]
> I stumbled upon this last weekend while trying to find out 
> how balls for
> ball bearings are made.
> 
> A picture of a Machine for making spheres of rocks is located at
> http://www.jaderockshop.com/sphere3.gif.  
> 
> 
> My question is: Are both cups powered?  And are they counter rotating?