[time-nuts] Machining some aluminum help!

[Scott McGrath]

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 at comcast.net> wrote:
> 
>> On Sat, 29 Jul 2017 22:49:10 -0400, time-nuts-request at febo.com wrote:
>> 
>> ------------------------------
>> 
>> Message: 2
>> Date: Sat, 29 Jul 2017 20:57:56 -0400
>> From: Scott McGrath <scmcgrath at gmail.com>
>> To: Discussion of precise time and frequency measurement
>>    <time-nuts at febo.com>
>> Subject: Re: [time-nuts] Machining some aluminum help!
>> Message-ID: <F4DD2BEC-D51D-43B2-93F3-28A57CD6E8B4 at 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 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
>>>> 
>>>> 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 38
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