[time-nuts] Machining some aluminum help!
scmcgrath at gmail.com
Sat Jul 29 20:57:56 EDT 2017
Kerosine is a better tap lube for Aluminum as it is more persistent and less flammable
Content by Scott
Typos by Siri
> On Jul 29, 2017, at 6:41 PM, Joseph Gwinn <joegwinn at comcast.net> wrote:
>> On Sat, 29 Jul 2017 12:00:02 -0400, time-nuts-request at febo.com wrote:
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>> Message: 7
>> Date: Fri, 28 Jul 2017 14:11:09 -0700
>> From: "Gary E. Miller" <gem at rellim.com>
>> To: Discussion of precise time and frequency measurement
>> <time-nuts at febo.com>
>> Subject: Re: [time-nuts] Machining some aluminum help!
>> Message-ID: <20170728141109.71aad750 at spidey.rellim.com>
>> Content-Type: text/plain; charset="utf-8"
>> Yo cdelect at juno.com!
>> On Fri, 28 Jul 2017 12:46:30 -0700
>> <cdelect at 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!
>> 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
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