[ATM] Grinding Circles ( Making the pitch tool)

["Stuart Hutchins" <stuart452@earthlink.net>]

"Grind in haste; repent at leisure".  But surely now you will nail the ROC.
After that, figuring your 8 inch f/4.000 to Strehl 99 will be a slam dunk.
Your Foucault tester and mirror support are rock-slide steady, right?

----- Original Message ----- 
From: "John Stephen" <atmlist.net@johnstephen.org>
To: "ATM List" <atm@atmlist.net>
Sent: Saturday, October 16, 2004 10:19 PM
Subject: Re: [ATM] Making the pitch tool

>In hindsight, I
> should have used the spherometer to measure the original mirror as a
>sanity check,

Perhaps we could use the hindsight of others to avoid going backwards
ourselves.  But maybe not.

> but I foolishly assumed that the place I bought the spherometer
from
> had verified its operation.  Stupid stupid stupid.

Is that the same spherometer that would not render consistent readings on
your first mirror grind, the plate glass?  Or was that a different thread
and project?  I wonder if the beginning letters of 'assume' have the same
connotation in other languages as they do in English?

Reminds me of the time, as a junior high student, I was making model
sailboats.  In a convulsive 2-hour fit of creativity, I designed a device,
powered by a little windmill at the top of the mast, to trim the sails to
the shifting wind.  An "Automatic Sail Setter".

Surprisingly, my homeroom teacher let me stand up in front of the class on
show-n-tell day, inflated with enthusiasm and the glow of genius, to tell
them all about my ***.

I am not stupid, and caught on to the laughter real fast, though I had
trouble joining in.  Due to the hecklers, though, most of the students
probably missed the fine points of my invention.

(name withheld on account of embarrassment)


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