Help! > Mistakes, muckups, and dangerous behaviour

Small broken taps blind hole fix easy

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Team ricky:
Hello gents,

I thought I’d share how to remove a broken tap in your nice new shiny part you don’t fancy scraping ;)

As long as the part is non ferrous or stainless steel thus trick will dissolve that pesky tap no machinery or damage to the threads / main part every time !

The solution is ‘Alum powder’

Mix 50-75 grams in 500ml hot water (80-90c)

Stir well then put your part in fully submerged in a plastic container lid on…

If you have an outside heat source you can maintain 80-90c to speed up the reaction dramatically…
In this condition an M2 tap will disappear in 2-3 hrs completely

If you wrap the container to keep the heat in 1 day whilst occasionally de-canting and re-heating works too!

I found the powder on EBay £2.99

Works a treat every time !

YouTube has some vids too which explain further

Kim:
Yeah, I've had some marginal success with the old alum trick also.  It takes a while, but as you say, keeping the solution warm helps speed up the reaction. But still, it's not fast...

So what part did you break a tap in?  I've done it more times than I'd like to admit.  :embarassed:

Kim

crueby:
For faster removal and in other metals, I usually use the old dental bur trick - high speed dentist-type air rotary tool with very small diamond coated burs, and cut out the center section down the center of the broken tap. Then the threaded parts around the outside can be picked out.


Not that I've broken taps. Today, that is!   :Lol:   Usually right after noticing that its not cutting as easily as normal, and thinking 'hmm, this tap may be getting dull (SNAP)'   


Have broken fewer since getting a tapping stand, but still happens when they are getting dull or if I dont use enough oil or dont clear chips or dont notice its bottomed out in the hole or any of the other umpteen reasons!

pirmin:
if it is a hss tap, u can drill with carbide and hammer it out with a small chissel. it takes forever but it works and if done corect you end up without any harm to the part. ( i have done that with a M1 Tap . even more fancy when your M1 Threaded rod breaks in the die and you have no stubby end to hold on, i had to make a tiny tiny carbide boring bar and was able to bore it out.

I also have Alum Powder , but i think it would be fair to say that it only works in aluminium  or Non Feric metals ,or am i wrong ?

For People who Do Break a lot of Taps, i recommend you Guys to buy a set m1 Taps or 8 BA , and Practice  ;D
After i broke Two! m1 taps in a row , it never ever happend to me again sicne then. in my 3 years of machining ( Daily) i have broke 3 Taps so far

Team ricky:
My tap was in a Bronze cylinder casting so Alum is the way forward! Pretty much no risk to the part which is why I went with it and used patience ;)

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