RE: ATM Pit Problems

[BOB PRABOWO <BOB@bahana.co.id>]

Chris wrote:
>I am now working on the 500 grit carbo. I used a eyepiece to view my
>mirror and found some pits close to the center with a few wide spread
>on the edge. I continued with 500 grit but the pits don't seem to be
getting smaller.  

I had the same problem. I was using #400 and saw some pits. I kept on
griding using #400 but the pits didn't go away. Then someone from the
list told me that it's possible that I tried to remove pits caused by
#400 with abbrasives #400.
If I were you, I would use #500 for, say, 2 more wets, if the pits
remain then chances are the pits are caused by #500. So I would move on
to finer grade. Go to finer grade instead of coarser. 

I marked the pits using a permanent marker. But, I didn't mark the back
of the mirror. 
I marked the pits right on the pits so if the marks are gone, then I
know that the pits are also gone. Just like Sharpie Test, but I didn't
draw lines, instead I simply touched the pits with the tip of the
marker, just to leave marks.

Bob P. Sumitro
Jakarta, Indonesia

Seeing me before him 
the enemy raises his sword
to strike,
but by that time 
I already stand behind him

-Morihei Ueshiba-

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