[ATM] What the schmidt?

[tillerman1@videotron.ca]

The vacuum pan is complete and the rim was greased, boiled distilled
water added to the pan and the 6.125" corrector blank gently pressed
in place so as to remove almost all bubbles.
I sucked the pan down to the required sagitta and left it alone, after
6 hours it had lost half the sagitta. Sucked it down again and left it
for another 8 hours, lost about 1/8 the sagitta. Sucked down again and
left it for 10 hours with no loss.
Spent a little over an hour tonight with 400 grit cautiously grinding
the tool profile into the corrector blank. There is about a 1"
diameter spot in the middle that isn't ground yet and the tool has
changed to try to match the original deeper sagitta of the vacuum pan.
I'll regrind the tool tomorrow night after the kiddies are in bed and
then go back to grinding the corrector and do a few more passes (I hope).
I think this is the most time consuming part of the grinding, once I
get past this it should go pretty fast (comparitively) through the
other grits and then comes the hours of polishing.
Many thanks to Bob Pfaff and Dave Rowe for the documentation and
knowlege they have put on line on various sites.

George Anderson
Montreal Canada

Clear skies and good health

_______________________________________________
ATM mailing list http://www.atmlist.net/