From: "Richard F.L.R. Snashall" 
To: Atm List 
Reply-To: "Richard F.L.R. Snashall" 




James P Crombie wrote:
>
> Hello all
>  As my mirror grinder nears completion  I needed another spherometer, as
> my earlier one is out on loan. So I found some scrap SS at work and did
> a quick sketch and over the last two nites machined a ring style
> spherometer.  4" for mirrors and 3.75" inside for use on lense(someday
> :-)  The base was lapped flat and square to the sides
> http://users.eastlink.ca/~jpcrombie/pics/4_inch_spherometer_2.jpg
> http://users.eastlink.ca/~jpcrombie/pics/4_inch_spherometer_3.jpg
> http://users.eastlink.ca/~jpcrombie/pics/4_inch_spherometer_4.jpg
>

What keeps the dial indicator from slipping?

        Rick S.

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