[ATM] More Grind

[vorblesnak@peak.org]

Had a rough day at the office and came home with enough attitude to get
another 3/64ths of hogging in.  Sagitta stands at 7 to 8 64ths.  By our
old friend r^2 over 2R, seeking an f7 curve on this 14.5 inch blank I get
93 inches of focal length at 9/64ths and 105 inches at 8/64ths.  So I have
about 1/64th left to hog.  The ground surface is about 3/8ths of an inch
away from the edge of the disk.  I am thinking I will switch to 120 grit
to get that last bit of depth and move the grind out to the edge.  By then
I should have a nice smooth graceful curve to finish out.

Looking at my notes, including the romp into grit creation, I have about 7
hours into the job.  Doing pretty well.

14.5 inch diameter
1/2 inch thick
f7 target

David Davis
Toledo, OR 97391



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