[time-nuts] Machining some aluminum help!

Scott McGrath 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:
>> Send time-nuts mailing list submissions to
>>    time-nuts at febo.com
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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!
>> 
>> 
>> 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
>> ******************************************
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