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Posted by Martin H. Eastburn on January 25, 2008, 9:50 pm
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This is Al isn't it. Seems to me that a finner pitch tap would drill
a hole. The force on the soft metal would tear out the threads as it went.
The idea of fine pitch was to have multiple - 3 or more - into the metal.
e.g. sheet or small brackets.
What is the real facts - please.
Martin
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/
Lew Hartswick wrote:
> Dave99 wrote:
>> Thanks for the tips... For some reason I never even thought to
>> countersink first. I suppose I could try 4-40. My thinking was just
>> that, it being a softer metal, that a larger thread was the way to go.
>>
>> DD
> You could use either 5-40 or 6-40 also. They are standard taps.
> the finer thread makes it easier to tap also.
> ...lew...
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> countersink first. I suppose I could try 4-40. My thinking was just
> that, it being a softer metal, that a larger thread was the way to go.
>
> DD