Re: [ATM] Pits and Pendulums

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

Hi Charles:

Yes you are right and I have no doubt as to which I prefer, the compound 
curve generator but then this is an ATM list and the "A" stands for amateur. 
The idea is to get the mirror done. It is so easy to set up a pendulum and 
cut a board for the radius then take the thing down when you are done. An 
imperial attitude is not going to work for a onesy twosy budget. It would be 
an unreasonable and unfair for me to disuade anyone with Geo needs that they 
shouldn't drive unless it is a Ferrari. 80 grit will take out them roughs in 
no time. 80) Alway beware that dust powder is a danger, keep it damp and 
keep it contained. Never let glass dust dry and blow. Alway wear a full face 
shield and a dust mask.

Clear Skies and Bright Optics, -Rick


----- Original Message ----- 
From: "Charles Mitchard" <charlesmitchard@iinet.net.au>
To: <atm@atmlist.net>
Sent: Sunday, October 28, 2007 12:21 AM
Subject: Re: [ATM] Pits and Pendulums


> Hi all,
> I used a pendulum grinder and found it was easy. Excellent curve albeit
> rough from the diamond size.
> For a convex face I generated a concave curve in a plaster tool, lined
> it with steel dumps and used that to grind the convex into the blank. As
> to which way is best? depends upon what you have at hand does it not?
> Regards
> Charles
>
> -- 
> www.members.iinet.net.au/~charlesmitchard/index.html
>
> _______________________________________________
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> 

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