Removing Broken Taps
Broken taps are common place and are a real hassle. They are usually hard to get out and you are in the final assembly stage just to make it more complicated.
Drill Bit Kit
Here's a few ways to get out your broken tap-
1) Carefully chip it out with a hard punch. This can be messy and could end up damaging the existing thread and hole.
It is possible however if there is not much of the tap left in the hole.
Difficulty level= 5 Success= 5 (it usually make a bit of a mess)
2) Braze a small shaft onto the tap so you can turn it out where it came from. This requires a gas plant and brazing rods etc.
Once moving though, the tap should come straight out. You sometimes need to machine or grind the end of the tap flat to get a contact surface for your small shaft.
Difficulty level= 8 Success= 7 (it usually takes a bit longer and requires equipment)
3) Drill out your tap with a hard reverse carbide drill.
This is the most common way to remove tap. You do need a milling machine or drill press to use a carbide drill, the are brittle and using a cordless drill could snap it off compounding your problems. As it is drilled out sometimes the tap will start unwinding back up the thread(as its a reverse drill). If this happens the thread is usually undamaged and ready for the next tap.
Difficulty level= 5 Success= 9 (requires drilling equipment which most machine shops have-we do see here). Next time you are unfortunate enough to break your tap let us have a look at it and help you out.
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Nov 19, 2011 22:51:44
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