>
> > It's called a Drill-Out (trade marked and patented). It's a left hand
> > drill bit with a self-centering tip with a screw down expanding collet/
> > extractor.
> ...
> > 2) Advance the collet/extractor down towards the drill tip so that 2 or
> > 3 theads are showing. Bring the drill up to the recommended RPM
> > speed and insert tool into the hole. The collet/extractor will
> > engage the top of the broken bolt and extract it.
>
> I have never had a bolt or stud break off with less torque than some amount
> FAR beyond the maximum that any electric drill I've ever used could hope to
> produce (or any EZout could hope to transmit, for that matter...)
>
Yeah, and anything that will drill out a grade 8 bolt is bound to be
brittle, and I have never IN MY LIFE had an EZ-out actually work (I
keep trying though, I've broken a lot of them). The screw down collet
piece also has a hex section at the top so you could put a wrench or
a deep socket on it once your drill stalls. The collet expands as it
theads down the center drill, so once it's wedged in, it should be in
there pretty solid. I suspect you use the drill to get the collet
wedged in, then go on to an impact tool.
Some people claim to have removed bolts just by using a left hand drill
bit. I have never personally witnessed this one either.
Still, the design on this thing is significantly different from an EZout
so it looks like it might actually work. Who knows, I have a front
end rebuild coming up in the next couple of weeks; I might get an
opportunity to try one ... If I do, I'll be sure to report it.
--
Paul Amaranth Manager User Services - office: (313) 370 4541 (also voicemail)
(internet) amaranth@vela.acs.oakland.edu |Best error message that wasn't
(bitnet) amaranth@oakland |supposed to show up: HODIE
(uucp) ...!uunet!umich!vela!amaranth |NATUS EST RADICI FRATER
|