On Sat, 29 Jul 2017 22:49:10 -0400, time-nuts-request@febo.com wrote: > > ------------------------------ > > Message: 2 > Date: Sat, 29 Jul 2017 20:57:56 -0400 > From: Scott McGrath <scmcgrath@gmail.com> > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Subject: Re: [time-nuts] Machining some aluminum help! > Message-ID: <F4DD2BEC-D51D-43B2-93F3-28A57CD6E8B4@gmail.com> > Content-Type: text/plain; charset=us-ascii > > Kerosine is a better tap lube for Aluminum as it is more persistent > and less flammable NO. Kerosene is *not* a good lubricant for _forming_ taps. Kerosene (WD-40) and alcohol are good lubricants for _cutting_. For _forming_, one needs something very viscous, something that lubricates at very high pressures, at the yield strength of the material being formed. Joe Gwinn > Content by Scott > Typos by Siri > >> On Jul 29, 2017, at 6:41 PM, Joseph Gwinn <joegwinn@comcast.net> wrote: >> >>> On Sat, 29 Jul 2017 12:00:02 -0400, time-nuts-request@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" <gem@rellim.com> >>> To: Discussion of precise time and frequency measurement >>> <time-nuts@febo.com> >>> Subject: Re: [time-nuts] Machining some aluminum help! >>> Message-ID: <20170728141109.71aad750@spidey.rellim.com> >>> Content-Type: text/plain; charset="utf-8" >>> >>> Yo cdelect@juno.com! >>> >>> On Fri, 28 Jul 2017 12:46:30 -0700 >>> <cdelect@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 38 > ******************************************

I dont want to start a flame war here but I tend to take the recommendations in Machinery's Handbook as the basis for process decisions. for the last 75 years Machinerys Handbook recommend Kerosene as a tapping fluid for Aluminum even for forming taps Btw if anyone here has a machinists tool box that odd rectangular drawer is for your copy of Machinery's Handbook http://new.industrialpress.com/machinery-s-handbook-30th-edition-toolbox.html WD40 should not be used in any machining operation it was initially created for the USAF to remove water (WATER DISPLACER formula 40) from missile parts which had gotten wet and to leave behind a dry lubricant to prevent corrosion and force out water via capillary action Thats why it works on seized fasteners the capillary action gets the lube into the corrosion cells allowing fasteners to move Content by Scott Typos by Siri > On Aug 7, 2017, at 10:36 AM, Joseph Gwinn <joegwinn@comcast.net> wrote: > >> On Sat, 29 Jul 2017 22:49:10 -0400, time-nuts-request@febo.com wrote: >> >> ------------------------------ >> >> Message: 2 >> Date: Sat, 29 Jul 2017 20:57:56 -0400 >> From: Scott McGrath <scmcgrath@gmail.com> >> To: Discussion of precise time and frequency measurement >> <time-nuts@febo.com> >> Subject: Re: [time-nuts] Machining some aluminum help! >> Message-ID: <F4DD2BEC-D51D-43B2-93F3-28A57CD6E8B4@gmail.com> >> Content-Type: text/plain; charset=us-ascii >> >> Kerosine is a better tap lube for Aluminum as it is more persistent >> and less flammable > > NO. Kerosene is *not* a good lubricant for _forming_ taps. > > Kerosene (WD-40) and alcohol are good lubricants for _cutting_. > > For _forming_, one needs something very viscous, something that > lubricates at very high pressures, at the yield strength of the > material being formed. > > Joe Gwinn > > > >> Content by Scott >> Typos by Siri >> >>>> On Jul 29, 2017, at 6:41 PM, Joseph Gwinn <joegwinn@comcast.net> wrote: >>>> >>>> On Sat, 29 Jul 2017 12:00:02 -0400, time-nuts-request@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" <gem@rellim.com> >>>> To: Discussion of precise time and frequency measurement >>>> <time-nuts@febo.com> >>>> Subject: Re: [time-nuts] Machining some aluminum help! >>>> Message-ID: <20170728141109.71aad750@spidey.rellim.com> >>>> Content-Type: text/plain; charset="utf-8" >>>> >>>> Yo cdelect@juno.com! >>>> >>>> On Fri, 28 Jul 2017 12:46:30 -0700 >>>> <cdelect@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 38 >> ****************************************** > _______________________________________________ > 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.

Joseph wrote: > For _forming_, one needs something very viscous, something that > lubricates at very high pressures, at the yield strength of the > material being formed. I've had excellent results with STP oil treatment, by itself or with added Tungsten disulfide. I frequently tap under power at 20-150 rpm, using Tapmatic self-reversing tapping heads. Best regards, Charles

On 8/7/17 7:36 AM, Joseph Gwinn wrote: > On Sat, 29 Jul 2017 22:49:10 -0400, time-nuts-request@febo.com wrote: >> >> ------------------------------ >> >> Message: 2 >> Date: Sat, 29 Jul 2017 20:57:56 -0400 >> From: Scott McGrath <scmcgrath@gmail.com> >> To: Discussion of precise time and frequency measurement >> <time-nuts@febo.com> >> Subject: Re: [time-nuts] Machining some aluminum help! >> Message-ID: <F4DD2BEC-D51D-43B2-93F3-28A57CD6E8B4@gmail.com> >> Content-Type: text/plain; charset=us-ascii >> >> Kerosine is a better tap lube for Aluminum as it is more persistent >> and less flammable > > NO. Kerosene is *not* a good lubricant for _forming_ taps. > > Kerosene (WD-40) and alcohol are good lubricants for _cutting_. > > For _forming_, one needs something very viscous, something that > lubricates at very high pressures, at the yield strength of the > material being formed. > Like Molybdenum Disulfide or STP?