Well I did some research and found my new best friend! 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!!!! Cheers, Corby _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
