Re: [ATM] polisher spindle diameter

[Mike Lockwood <melockwo@uiuc.edu>]

Bill,

The turntable of my 32" machine is mounted on a large sprocket that is 
bolted to a 2" shaft.  Flange bearings at the top and bottom of the 
shaft provide smooth rotation.  It works fine - no vibration, no slop, 
and I have never made the turntable flex.

IMO the larger, expensive precision bearings are a luxury, and not 
truly necessary.

For those who might want to debate mechanical design, I am not 
interested.  I'm just saying what works for me.

	Mike Lockwood

William 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.
> But, I had a conversation with a friend of mine, a
> retired engineer/machinist, who has an incredibly wide
> knowledge base on all things metal and moving. 
> He suggested I get some thick wall steel tubing, 4"
> diameter, 1/2" wall thickness, or something similar,
> with a cut being made top and bottom to accomodate a
> heavy duty precison bearing.  Have a flange welded to
> the tubing, so it can be bolted to the channel
> bracket, then bolted in the frame. (Frame material is
> 6" high wide-flanged I beam)  He seemed to think that
> the pillow block setup was definitely not the way to
> go for the most stable, vibration free, main spindle.


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