I wonder how an impact driver would work on a broken bolt if one uses a
large Phillips bit and uses a Dremmel tool to create a crtoss hatch on
the broken bolt!!!
Joe (C)
-----Original Message-----
From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On
Behalf Of Randall Young
Sent: Wednesday, October 08, 2003 11:17 AM
To: FOT@autox.team.net
Subject: RE: flywheel bolts
> 1. There is a machine called a "tap disintegrator" that uses an
> electrical
> discharge through a consumable electrode to destroy a hard part
> in a hole.
> Usually a stationary machine, but there are a few portable ones on the
> market. Disintegrating a tap, or in this case a broken bolt, does not
> damage the threads in the part. If you can find a shop that has a
> portable
> rig, or if you want to disassemble the engine and take the crank in,
this
> is one way.
FWIW, there are also plans running around to build one of these on your
own.
It's called Electrical Discharge Machining, or EDM for short, and I've
seen
several articles published in Home Shop Machinist. I believe you can
still
buy the back issues with the various articles, and they also sell
reprints
of one of the more detailed articles.
http://www.homeshopmachinist.net/
One of the articles talked about using the unit to machine out a broken
and
corroded steel stud in an aluminum engine block, made it sound easy
(although slow).
Randall
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