Wednesday, March 26, 2014

140326 JerryW cutting hole in 10"

140326  Jerry passed on these photos of the time that JoeD was 2" hole sawing through the 10" mirror that Jerry is making:

JerryW says:
We are using a steel tool to core a 2 inch diameter hole in the back of a 10 inch f/4 Pyrex mirror.  The mirror is at the #120 stage of grinding with the same size grit used for coring.  The cutting at this stage will stop about 3/16 of an inch from the front surface and will be completed from the front surface after polishing and figuring. The work was done using Joe D's drill press.

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