[TheForge] Broken tap

Fri Sep 27 13:18:01 2002

Subject: Re: [TheForge] Broken tap

Thank you Charles, this is exactly what I am looking for.

Darrell

http://www.machinemaster.com

> 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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