Re: ATM METAL WASHER TOOLS

[Adam Perkins <scopeguru@yahoo.com>]

> You would be better off to get someone to pour a
> tool
> for you with the desired ROC.
> 
> 200mm (8") f/4 -->  1600mm (64") ROC.
> 
> Anyone here have a mirror with 1600mm ROC?
> 

Hi,

I've thought about this one before, and might try the
following procedure:

Cut a mdf disk to the desired tool diameter.

Use a random-orbit power sander in a tool-on-top
situation, circling the wooden blank much as you would
a mirror.  Move the sander back and forth
diametrically.

Check the resulting concave curve with a template.

Cover the new wooden "mold" with thin plastic-wrap and
pour the plaster as usual for a plaster tool.


I haven't tried this out, but it might work for you.

Adam Perkins
Covington, Louisiana
USA





__________________________________________________
Do You Yahoo!?
Yahoo! Auctions - buy the things you want at great prices
http://auctions.yahoo.com/