[TheForge] Broken tap

Fri Sep 27 09:23:01 2002

The trick is to use an acid.  Can't recall which one, may be plain battery
acid.  Trick is it eats steel/iron, won't touch aluminum.   Soak the aluminum
part in the acid for a couple of days and then pull it out.   No busted tap or
bolt, just some dust in the acid and a really clean aluminum part.  Wont work if
you have any steel inserts.  I will look in my files today to see if I can find
the acid type.

Charles  Vincent

Dan Tull wrote:

> Can you heat the al. to forging temp. then punch out?
> ----- Original Message -----
> From: <[email protected]>
> To: <[email protected]>
> Sent: Friday, September 27, 2002 8:19 AM
> Subject: Re: [TheForge] Broken tap
>
> > taps are pretty darn hard. what kind of a drill are you using to clean out
> the hole?
> >
> > i have had some success using those tap removers that have three or four
> wires (depending on the tap) that go thru the flutes of the tap and then
> twisting it out. problem is that if the tap was stuck enuf to break it's
> usually stuck enuf to not back out.
> >
> > ez outs are the most mis named thing out there. they work okay for
> removing a broken bolt but a tap? i wouldn't bet on it.
> >
> > will edm work in aluminum?
> >
> > if you get desparate you might try punching the tap out from the back side
> and then drilling and tapping an oversized hole. this could save that part
> if workable.
> >
> > good luck.
> >
> > bob s.
> > _____________
> >
> > >In my experience most broken tap removal that leaves you with a
> servicable hole, requires drilling. Even in large applications on steam
> turbine maintenance overhauls I used to collect all the EZ-outs, and other
> gadgets from the millwrights and have them use a tap size drill and tap out
> the remaining metal. Still a tricky operation, but then you aren't trying to
> extract the EZ-out.
> > >
> > >Ray
> > >Cincinnati
> > >>
> > >> From: "Darrell" <[email protected]>
> > >> Date: 2002/09/26 Thu PM 09:16:26 EDT
> > >> To: <[email protected]>
> > >> Subject: [TheForge] Broken tap
> > >>
> > >> How do you remove a broken tap from aluminum? I seem to recall that
> there is a
> > >> chemical means to do this.
> > >>
> > >> Darrell
> > >>
> > >> http://www.machinemaster.com
> > >>
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