|Well, as I described the mirror
blank and tool got stuck. One of the centering bolts sure applied some
pressure, resulting in this fine (is fine
the correct term here?) damage, which is 45 by 23 mm in size (1.8 by
0.9 inch). Sigh.
|After a total of about 5 hours
on the machine the tool wore out. At first I noticed some tendency of
the tool to ride up against the blank and didn't worry, just added grit
and water until it rode fine again.
When it was time to check with the Spherometer I found out about the tool. Now I am attaching new tiles with a PU glue, hoping that it holds the tiles.
|After the first hour of polishing
|Another hour of polishing, the
tool moved in by 5 mm (0.2")
|Still a hill in the middle, 4