From: Dominic-Luc Webb 
To: Thomas Janstrom 
cc: Scott Berfield , atm 
Reply-To: Dominic-Luc Webb 


On Thu, 27 Mar 2003, Thomas Janstrom wrote:

> Gloves for polishingScott, this might have been mentioned before, but the
> gloves also insulate the mirror from your hands so the is less chance of
> thermally inducing a turned edge, just one more benfit...

Perhaps my hands cause thermal turned edge, but my polishing tool, with a
gear-tooth edge seems to deal with TDE just fine. I often work on a
statistical basis: is the proposed problem significant or not significant
in terms of the precision of the mirror. It is in this reasoning the pro
gloves start to lose it. Gloves lack the dexterity of a human hand and at
the same time TDE is readily controlled down to statistical insignificance
by use of somewhat larger aperture than needed and intellident shape of
tool shape and type and quality of strokes used. My very low aperture
mirrors (i.e., less than F/1.6) had significant TDE from beginning. I have
since eliminated TDE more or less completely without resorting to any means
of controlling temperature, other than not using very fast strokes.

Dominic-Luc Webb

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