Re: [ATM] broken hands mirror making

["Eric S. Johansson" <esj@harvee.org>]

Thomas Janstrom wrote:
> Hi Eric,
> 
> Try a Mirror-O-Matic very simple machine to build and it is built from
> common/cheep parts that should be procurable from any decent hardware store.

Mirror-o-matic is a truly interesting design.  I think I might build one of 
those over the winter.  Personally, I'd rather borrow/rent/purchase used so I 
can focus on mirror making rather than another construction project I'll never 
get done because I can only find 90% of the parts.  :-)

but in my research, I found we had an interesting mirror making design from one 
of our own.

http://www.fortunecity.com/marina/manatee/1879/spindle/spindle.htm

I've seen similar designs where simple positioning and friction changes work out 
just right to make  a sphere.  Two questions: Bob has the spindle running a 60 
rpm (is that slow enough?)  And why does he say it's only good up to 6 inches? 
Is this a limitation of the torque available from the spindle motor?  If you 
went slower with more torque, could you handle a larger mirror?

Personally, I'm only interested in 10-12 inch mirrors at max but that's one hell 
of a lot of torque required especially when polishing.

---eric

-- 
Speech-recognition in use.  It makes mistakes, I correct some.
_______________________________________________
ATM mailing list http://www.atmlist.net/