Re: [ATM] What a wonderful sound!

["Bob May" <rmay@nethere.com>]

On the other hand, the worst grinders that I've seen are the
"detail nuts" that have to have everything exactly just this way
and no other.  They're the ones that make astigmatic mirrors and
lenses.  Got one right now that is really wanting things done
just so and they have to be exactly the way he says they have to
be.
Just do it and remember that it's only a bit of time to fix any
problem other than a broken piece of glass (you need a big HOT
oven for that job!) and it takes a LOT of hard work to actually
make a mirror really astigmatic to where you have to grind to get
the astigmatism out.
Bob May

rmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net

----- Original Message -----
From: Mark Holm <markholm@verizon.net>
To: <atm@atmlist.net>
Sent: Saturday, May 03, 2008 8:02 PM
Subject: Re: [ATM] What a wonderful sound!


> I haven't done small tool grinding, but I think I see a problem
anyhow.  You are not nearly uniform enough in round the
> barrel movement.  If you keep doing like I saw, you will be
wildly astigmatic, wildly enough to be a problem even in
> smoothing.  You will never get as nearly stigmatic with a small
grinding tool as with full size, but at hogging time, it
> isn't a problem unless you are wildly out.  So, get more
uniform about the round the barrel movement, but don't obsess
> about it.  It's a practice that will be needed later anyhow, so
you might as well get in the habit now.
>
> Mark Holm
> markholm@verizon.net
>
> Bill Wheaton wrote:
> > Does it look
> > like I am I doing it right?
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>

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