2017-07-28 19:46:30 UTC
If you remember I needed: "I have a square aluminum tube 5" X 5" with a
.25" wall it's 8 1/2" long.
I need 20 holes in each end tapped for 4/40 and 1/2" deep."
This for a Rubidium standard I am working on.
I found all about self forming taps!
I drilled the 20 1/2" deep holes and then made a handwheel to attach to
the pulley on my drill press. After mounting the tap in the drill press
and putting a dab of Crisco on the tap I was able to tap each hole to a
depth of 7/16" as fast as I could turn the handwheel!
I then got another 8-32 self forming tap to do the holes for 15 feedthru
capacitors, again as fast as I could turn the handwheel.
I'm very happy to discover these taps!!!!
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