Re: [ATM] Pitch Substitute for very fast mirrors

[Kevin MIchael Zabbo <chaosopher23@yahoo.com>]

They used pitch laps, of course.  However, we've come
a long way in synthetic materials since the discovery
that pitch is a good polishing lap.  I'll let everyone
know if this material is the New Pitch of the 21st
century once I get the mirror test results done.

Right now, I'm using a normal stroke TOT, tool
undersized (8") to bring it to a spherical shape.  I'm
getting a good feel from RTV silicone.  It feels like
it's working.  Silicone is cheap and widely available
- the prime motivator in my decision to abandon pitch.
 I don't need to put silicone on a stove to make it
into a tool, the second motivator.  The third is that
my wife really doesn't like the smell of pitch (I
think it smells good).  Everyone knows the benefits of
a happy spouse.

If it doesn't work, I will go back to pitch.  I still
have a little left, and if I don't have enough, I'll
tap a few of these yellow pines nearby and boil it
down.

Kevin of Central Mississippi
Found the Darkness

--- Ken Hunter <atm_ken_hunter@yahoo.com> wrote:

> PLEASE...
>   Tell us how all the previous FAST and large
> mirrors that were made on a pitch lap these last 150
> years were able to be made. Obviously it's an
> accidental process that some folks have been able to
> exploit to some extent...
> 
> Kevin MIchael Zabbo <chaosopher23@yahoo.com> wrote:
>     Pitch does have a lot of useful characteristics
> that I
> won't get into here, but it has a flaw that I need
> to
> point out.
> 
> Fast and large mirrors, say 13" f/3, have a
> deviation
> from sphere that can be measured on a decent
> micrometer, which is far too big a gap for pitch to
> conform. The pitch, even if soft, takes a long time
> to flow.
> 
> 
>    
> 
>  
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