broken tap, sigh

I feel for you.

Did you manage to wiggle it back out or did you go for the brutal pin punch
solution?

On Sun, 15 Apr 2012 09:23:28 +0000 (UTC), David Lesher


If you got lots o' time, nitric acid will disolve the tap and not hurt
the AL

Karl

On 4/15/2012 5:23 AM, David Lesher wrote:

Do you have a mill? A carbide end mill will remove it. Lots of air &
lock the quill & raise the knee slowly.

MikeB

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I've read in several places that alum works wonders for disolvin taps
in non-ferrous metals. Haven't tried it yet, but here's some reading:
http://www.homemodelenginemachinist.com/index.php?topic=3D270.0

I  have read that aluminum sulphate also works.  You can get the
aluminum sulphate at garden centers. It is used to make soil more
acid.

                                  Dan

On Sun, 15 Apr 2012 10:58:13 -0700 (PDT), dcaster@krl.org wrote:


reading:http://www.homemodelenginemachinist.com/index.php?topic=270.0

I've used it.   A cold solution didn't seem to do anything.  Even when
kept near boiling it's still a slow process (hours); but it got the job
done without damaging the part I was working on.

Bill
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On 4/15/2012 5:23 AM, David Lesher wrote:

I've often had luck by grinding a O-1 drill rod of the right diameter to
fit into the flutes of a 2,3 or four flute tap.  Harden the rod and draw
it back to dark straw. Then, carefully unscrew the tap.

Yes, and a mill, and a 20 ton press, but...

So one approach is the end mill from the back. Would have to be small as the
tap, or smaller.
Which is better first attempt; mill or hammer?

Once it's out [HA!] is there such a thing as a helicoil? Or do we drill & set a
alumimum dowel in from the back?

Of course, if someone in Laurel MD has an EDM tap remover......


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Basically, I earn my living fixing this kind of shit, err or mostly by
making sure that it never happened in the first place...

Got any money ?