On Sat, 29 Jul 2017 12:00:02 -0400, time-nuts-requ...@febo.com wrote: > Send time-nuts mailing list submissions to > time-nuts@febo.com > > Message: 7 > Date: Fri, 28 Jul 2017 14:11:09 -0700 > From: "Gary E. Miller" <g...@rellim.com> > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Subject: Re: [time-nuts] Machining some aluminum help! > Message-ID: <20170728141109.71aad...@spidey.rellim.com> > Content-Type: text/plain; charset="utf-8" > > Yo cdel...@juno.com! > > On Fri, 28 Jul 2017 12:46:30 -0700 > <cdel...@juno.com> wrote: > >> 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! > > > Cool! > > I suggest you get some real cutting fluid. The threads will be smoother.
I second that. What I use is a lubricant wax made by Lenox, the saw maker. It's intended for metal-cutting band saws, but works just splendid for form taps. There are many equivalents. By the way, when drilling aluminum, use denatured alcohol as the cutting fluid. This will prevent aluminum gumming up the cutting edge of the drill. And, as others have mentioned, one does not use the same size drill for forming taps as for cutting taps. The diameter accuracy required can only be achieved by using the correct number (versus fractional) drill bit size. Do not use Chinese drill bits - steel not good enough. US, Japan, Germany et al are OK. Joe Gwinn > RGDS > GARY > --------------------------------------------------------------------------- > > End of time-nuts Digest, Vol 156, Issue 36 > ****************************************** _______________________________________________ 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.
