On Mon, 06 Apr 2015 08:13:53 -0500, Ignoramus32423
wrote:

On 2015-04-05, wrote:
On Sun, 05 Apr 2015 07:47:14 -0500, Ignoramus10114
wrote:

I have an aluminum heatsink that I need to tap , I wanted to know if I
should use 6-32 or some less coarse thread like 8-32 would be better?
Both are 32 threads per inch, so how is one "less course"?

Because of bigger diameter.

i

A couple of minor points: You can tap aluminum to a higher thread
percentage than steel, because it takes so much less force to cut. But
there's little advantage to cutting deeper than 70% depth in any
material.

And two, if you have any old Tapmagic lying around (we who have it
hoard it like it's fine whiskey), don't use it on aluminum unless it's
the version that says "aluminum." It will boil and form a foul, black
gummy mess as it eats your aluminum for lunch.

Oh, and one more thing: "coarse" is not "course." d8-)

--
Ed Huntress