Re: [ATM] ATM - Zerodur- how much harder to figure?

[William Marriott <bmarriott@pacbell.net>]

Hello Ric;

Having worked a Zerodour piece, and am now helping a pal with a 6"
Zerodour, using CeO, it seems to take a "a lot" longer. Which is good in
this case as the 6" f15 needs to be spherical, so hopefully the hardness
will allow figuring to proceed with a good bit of control.  It took
quite awhile on a machine spindle to get the same curve from center to
edge. I have heard that Zirconium Oxide may cut better.

Just some thoughts

Bill Marriott

Ric Rokosz wrote:
> 
>  I was wondering how much longer it takes to
> work/figure a piece of Zerodur compared to
> pyrex,especially the figuring part considering that
> Zerodur is rather harder than pyrex.Was planning to
> use Cerium Oxide..is it really a lot ,lot longer or
> just a tad bit longer?
> 
> Ric
> 
> 
> 
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