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Step 3Top O-ring block
This was the first part that I designed and machined for the new apparatus. The through hole is 2.25" and the counterbore is a few thousandths larger than 2.5". Later on, the acrylic tubes would be cemented to both this part the bottom o-ring block.
The O-rings are 2 7/8" ID x 3 1/4" OD x 3/16" wide, McMaster-Carr P/N 9452K56. The through hole, counterbore, and O-ring grooves were machined on a lathe using a 4-jaw chuck. To cut O-ring grooves you can either buy parting/grooving tools, or grind your own from high speed steel tool blanks. I ground my own from a 3/16" HSS tool blank.
There are eight untapped through holes in this piece, the top cap block, and the counterweight for 1/4"-20 x 3" long stainless steel socket head cap screws.
The O-rings are 2 7/8" ID x 3 1/4" OD x 3/16" wide, McMaster-Carr P/N 9452K56. The through hole, counterbore, and O-ring grooves were machined on a lathe using a 4-jaw chuck. To cut O-ring grooves you can either buy parting/grooving tools, or grind your own from high speed steel tool blanks. I ground my own from a 3/16" HSS tool blank.
There are eight untapped through holes in this piece, the top cap block, and the counterweight for 1/4"-20 x 3" long stainless steel socket head cap screws.
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