Re: [ATM] polisher spindle diameter

[Douglas S Angle <Douglas.S.Angle@can.dupont.com>]

Bill,
There are indeed a lot of different ways of tackling your setup. 

I'm not sure that supporting the mirror on the spindle is the right way to 
go.  Our club has a grinding machine originally designed for 13" max 
diameter, but we ground and polished a full thickness 24" on it.  The 
spindle itself isn't that big, but the turntable rides on a flat bearing 
surface like a lazy susan.  There is no ball bearing - just two lubricated 
flat surfaces about a foot in diameter.  Advantage is that the support 
surface can be welded directly to the frame, and with the large bearing 
surface it is very stable.  The spindle is then only used to drive 
rotation, not also used as the support for the weight of the mirror. 

Photo gallery of the project at: 
http://130.15.144.99/rasc/graphics/24inch/page_01.htm

You can see that it takes a lot of weight:
http://130.15.144.99/rasc/graphics/24inch/20000622.jpg
Although I don't really have a good picture of the bearing.  Here's the 
best picture of the underside of the grinding machine, but still doesn't 
show the bearing well: 
http://130.15.144.99/rasc/graphics/24inch/grindingmachinemodifications_02.jpg

Good luck with the project.

-Doug


Bill Marriott wrote:


Well, seems there are a lot of different ways to
tackle my spindle/bearing setup. I was originally
thinking that I would use a 2" shaft with two pillow
block bearing mounted on a channel bracket bolted to
the machine frame.

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