Re: [ATM] Pits and Pendulums

["Stars" <rocketmaker@intergate.com>]

Actually having done it, my experience differs with your statement and you 
have over simplified the operation of the compound diamond curve generator. 
I used one before I made my pendulum but it was limited to six inches in 
diameter and was a huge machine. I used the pendulum grinder and finished my 
22" in less time than I could have built a good compound grinder. 
www.intergate.com/!rocketmaker/telescopes.htm is a photo of me with my 
grinder. I would love to see a photo of you with yours for I do plan to 
build a compound grinder but until I do I will continue to use the pendulum 
as it is works very well.

Cheers,
Rick

----- Original Message ----- 
From: "Anthony Stillman" <atmer@flash.net>
To: <atm@atmlist.net>
Sent: Saturday, October 27, 2007 8:44 PM
Subject: [ATM] Pits and Pendulums


>A grinder on a swing arm is not a good way to generate a curve.  A 
>generator based on the tried and true design, a grinding cup or disk held 
>and spun almost flat against the blank (the slight angle determines the 
>ROC) while the blank revolves on a turn table beneath is, I dare say, 
>better.  It's compact, its relatively safe and it can cut concave and 
>convex (when used with a cup) surfaces.  Something a pendulum can't do.
>
> Anthony
>
>
>
>
>
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