We have been working on an 12.5" f3.8 and after getting a nice
sphere polished out on the machine went on to figuring...
A batch of TOO soft pitch and and over eager helper resulted in the following images...after about 2 hours.
I believe we now have a slight hole in the center and a badly turned down edge of about .75 inches.
First image is almost null. With a 100 line/inch screen
Second image is +.200"
Third image is -.200" ...Cannot seem to get this to load???
Tester has the LED reflecting through the upper part of the
Ronchi screen and moves as a unit...
Thanks for any comments or corrective advice.
Preston
sphere polished out on the machine went on to figuring...
A batch of TOO soft pitch and and over eager helper resulted in the following images...after about 2 hours.
I believe we now have a slight hole in the center and a badly turned down edge of about .75 inches.
First image is almost null. With a 100 line/inch screen
Second image is +.200"
Third image is -.200" ...Cannot seem to get this to load???
Tester has the LED reflecting through the upper part of the
Ronchi screen and moves as a unit...
Thanks for any comments or corrective advice.
Preston
Attached Image:
