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Sid Squid · 05-07-06, 07:28 AM

Forgot.

Screw extractors:

These are either straight or tapered screws with reverse threads, they are usually supplied with appropriate drill bits, which may similarly be tapered.

You drill a hole in the broken stud/screw/bolt/whatever and screw in the extractor, being reverse thread you screw this in anticlockwise. The plan is that the extractor will grip the broken fastener and, going the other way, will unscrew it.

Same deal as with taps though - very hard material is used, they break easily, beware when using them. If you snap an extractor it's bloody hard to get it out, and you won't drill it out that's for sure.

05-07-06, 07:28 AM	#4
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Forgot. Screw extractors: These are either straight or tapered screws with reverse threads, they are usually supplied with appropriate drill bits, which may similarly be tapered. You drill a hole in the broken stud/screw/bolt/whatever and screw in the extractor, being reverse thread you screw this in anticlockwise. The plan is that the extractor will grip the broken fastener and, going the other way, will unscrew it. Same deal as with taps though - very hard material is used, they break easily, beware when using them. If you snap an extractor it's bloody hard to get it out, and you won't drill it out that's for sure. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"