Re: [ATM] First Pitch Lap - any tips?

[Jarvis Krumbein <jkoptic@juno.com>]

Bob, as an experiment try exactly centering either the channels or the
facets exactly.  Polish and then look to see what kind of zones you have
produced.  You will be quite surprised. If you are really inconsistent
about mirror/tool rotations and are sloppy about maintaining stroke
lengths, the zones may not be too bad.  If you really maintain consistent
strokes and mirror/tool rotations then the zones can be horrific. 
Decentering of the facets on the lap is important (see Amatuer Telescope
Making, Book 1).

Jarvis Krumbein

On Thu, 10 Jun 2004 09:27:21 -0700 "Bob May" <bobmay@nethere.com> writes:
> The pitch doesn't need to be in squares although balancing the number 
> of
> edges and area of pitch across the lap is a good idea.  Remember 
> that
> Texerau recommends that the lap grooves not be centered on the lap 
> but be
> offset by some value.  Why, I don't know as I figure any position of 
> the
> grooves should be good.
> I've used round and hex lap molds and they both produce quick and 
> perfect
> laps with little effort.
> Bob May
> http://nav.to/bobmay
> bobmay@nethere.com
> NEW! http://bobmay.astronomy.net
> 
> 
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> ATM mailing list http://www.atmlist.net/
> 


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