Re: [ATM] Trying to reach sphere

[Adam Krause <krausea34@yahoo.com>]

Jerry,

Here are the answers to the questions.

Thanks,

Adam

----- Original Message ----
From: Jerry <wa4guu@verizon.net>
To: Adam Krause <krausea34@yahoo.com>; atm@atmlist.net
Sent: Sunday, November 25, 2007 12:30:34 PM
Subject: RE: [ATM] Trying to reach sphere

Hello Adam.

First some questions.

>What size and f:# is it?
8" F/6.2 (at last check)

>Are you using a tile tool, or a non faceted tool?
Tile tool with ceramic (not porcelain) tiles.

>How long have you been working the 305?
Not long, about 30 minutes.

>What where you doing when you reached a sphere on previous grits?
When the center was not being worn during the sharpie test, I did 1/3 COC TOT.  Whenever the outside was not being worn, I would switch to 1/3 COC MOT.  My stroke has been getting smaller (1/4 COC TOT), but was still 1/3 COC and the grits were larger (400) when the mirror passed the sharpie test evenly.  I think I checked it at 600 grit as well, but mostly I just kept grinding away at 600 because I didn't notice any sticking so I guessed it was spherical.

>How much of the edge is wearing faster and how uniformly does the wear
>decrease inward to the center?
After about 10 minutes of 305 emery work the sharpie marks are still left, although faded, in a 3" diameter circle.  It is mostly faded out between 3" & 4" diameter.  It is gone from 4"-8" diameter.

>When you add grit to a wet do you separate the disks or just laterally
>offset the top disk to apply the grit?
I have experimented a little on adding grit with a lateral offset, but 95% of the time I seperate the disks, sprinkle on some grit, spray the mirror and tool with a spritz of water and lower the disks onto each other.  To get it uniform I move the top disk in a circle clockwise on the 50% zone with no pressure.  Then I start the standard stroke.


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