[TheForge] Broken tap

Fri Sep 27 13:51:00 2002

I checked my files.  Looks like sulfuric ( found at battery shops) or Nitric
(Radiator shops) acids will do the  trick.  I also have a note that aluminum sulfate
will work as well.   Seems to work best when the part is submerged in a heated
container , but will work fine without, just takes longer.   I would test it with a
bit of scrap aluminum and an old bolt before I dumped a valuable part in it just to
make sure.

Charles

Darrell wrote:

> 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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