Biscuit Cutters

A photograph of some of the biscuit cutters used in the project (another two are missing because they've been scavenged to build the ones shown here!).  The large one was used to cut the three 3/4" thick by 8" diameter disks used for producing the spherometer zeroing flat.  It is made from a 1/2" plywood disk and soft sheet iron of the kind used in automotive body work.  This cutter took ~40 minutes to cut through the 3/4" thick glass using #80 carborundum.  The tall cutter on the right was used to cut the hole in the primary.  It was made from a 2" muffler pipe connector soldered onto a brass cap.  The small cutter on the lower right was made from 1" brass tubing and was used to perforate the corrector lens.  The perforated Lexan disk (grey) in the upper right corner was used to align the biscuit cutter when cutting through the corrector lens.

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