Re: [ATM] Crayford Focuser

[Dave and Connie <dmatt@frontiernet.net>]

I can make my own shoulder bolts from a larger bolt or make up a sleeve and 
silver solder it to the bolt to have the same effect.  I have an old 6" 
Craftsman (Atlas) lathe with a full set of gears.  I am the second owner.

My son is an engineering student at RPI and has access to the manual 
machine shop.  I have to get him to take the CNC class.  Too bad he is 
EE/CompSci.

I should be able to fabricate something.

Dave


At 06:18 PM 2/11/2008, James Crombie wrote:

>Don
>    The problem with shoulder bolts is the minimum size is 1/4", and they
>are several thou smaller than the bearings ID. So that can allow some
>slop in the assemble. Also a bearing with a 1/4" id will have an OD of
>5/8", getting a little large for a focuser  A better mounting solution
>is to use hardened dowel pins which can be lightly pressed into the
>bearings and the mounting area.
>
>James Crombie
>http://www.jamescrombie.com
>
>Don Ware wrote:
> > When buying bearings, you should also consider shoulder screws to match 
> the ID and thickness of the bearing.  They hold the bearing more firmly 
> then a standard machine screw.
> >
> > Don Ware
> > http://webpages.charter.net/dware1/
> > _______________________________________________

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