Re: [ATM] Curious

["Neil Booker" <neil@astronomy.ndo.co.uk>]

Hi Bob

----- Original Message -----
> Sounds like you got the Willmann-Bell kit.

No, I got it from Beacon Hill Telescopes
http://www.beaconhilltelescopes.cwc.net/ several years ago.

> Those blanks are molded and it is your choice of which side to
> do.  I usually do the top side which needs beveling just because
> there is more area there in the end and the center is usually
> depressed.

I think in my eagerness to get going I subconsciously chose the unbevelled
side because the book said to bevel it first.

> The video more shows doing a COC stoke as you surmised and you
> need to do a bit of side swing to do the W stroke properly.  The
> amount of turning is more dependent upon how often you wish to
> stop and turn the tool and mirror.  I generally keep turning the
> mirror (I have a lazy wrist motion that turns the mirror as the
> stroke is done and keep moving my hands around the mirror) and
> turn the tool about every five minutes or so.  The big thing with
> the turning of the tool, which should be done even on a grinding
> machine , is to keep the tool from getting astigmatic and making
> for trouble.

So I guess what you're saying is that taking a step round the barrel / turn
the tool after each single push and pull isn't really wrong and a few pushes
and pulls between steps / turns is OK too.

> As to TDE, there are a numbr of ways to get rid of it, from
> flipping the tool and mirror over and working with te tool on the
> bottom to doing short strokes COC that should remove the TDE.

There have been a few posts here that I've kept and would like to start
pushing glass again to try them and learn a another or few more tests.

Thanks for the reply.

Neil


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