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Progress on grinding an 8".
Thanks for the encouragement from Sopticals (Stephen).
Progress report:
After ordering more #220 grit I was able to get close to the target Sagitta of 2.822. I actually only got to to 2.78 and was concerned that I wouldn't make it.
I pushed on with #320. I was able to pass required depth. Up to this time I was using mirror on top so I now had to try for the first time to use the Tool on top. Much easier to use this way. After moving the tool off centre, to one side, I was able to bring the depth back to the required figure.
By now the mirror is becoming smooth and transparent.
My Big doubt and first question is: My required Sagitta is only in a narrow circle in the middle of the mirror. Tutorials I have watched on line maintain the depth out toward the edge. What technique do you use when using a tool the same size as the mirror to widen this inner deep section.
Including pictures for the record.
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