RE: [ATM] Grinding question 2

["Jerry" <wa4guu@verizon.net>]

Since your curve is not out to the edge yet any wear at all in the center
will make the sag deeper since you are measuring the sag from the same high
unground annulus at the edge. 

You could use chordal stokes TOT to get less wear in the center but I think
you would do better just to continue with a W TOP until the curve gets to
the edge. It will get a little deeper until the curve gets to the edge and
then it will start to go shallower. Continue TOT until you get the sag you
want.


Jerry



-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
dhkblaszyk@zeelandnet.nl
Sent: Monday, March 14, 2005 4:01 PM
To: ATM
Subject: [ATM] Grinding question 2

Hi,

Well I followed your advice by using W-stroke which is wide at the ends. I
have succeeded in grinding down the edges, but the sag is now to deep (by
0,2mm). This is somehow strange to me because I suspected that the mirror
would become more shallow with TOT (apparently not). So my next question is
now, should I go from 80 to 120 now, or first correct the RoC with 80? I
believe I should use a CoC stroke with TOT now. Am I correct??

Kind regards, Darius Blaszijk
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