One word of caution: When using a left handed drill bit, make sure you
have a reversible drill and use it in Reverse! It works much better
that way! :)
Joe
John Knox wrote:
>
> Northern tool used to sell them, haven't looked in awhile to see if they
> still
> do, and most places that carry tools will sell them. They aren't as
> uncommon as
> you might think. They work really well in this type of situation. My
> father is
> a machinist, and I always got mine from him. Just center punch the
> bolt, then
> drill out. I second the advice on the easy outs,. They work ok, but do
> not put
> any kind of a side load on them. They snap super easy. I've never
> tried the
> snap on style. I actually had better luck with the super cheap Buffalo
> Tools
> brand easy out. They were not as hardened, and seemed to take a side
> load
> better. They are only good for one use though. They get pretty
> deformed in the
> process of removal.
>
> Can I also recomend driling a small pilot hole through the center of the
> bolt,
> and then going to a larger drill bit. If you have a second person to
> keep
> checking the drill allignment you can often do a good job of drilling
> down the
> center.
>
> As a last resort go to a size that will just eat out the threads. THis
> has to
> be done with a pilot hole as the drill will walk off the bolt into the
> softer
> material around it. Best done as the third hole in the series. Use
> really
> sharp drill bits and go slow.
>
> "Bowen, Patrick A RP2" wrote:
>
> > Where do you find a left handed drill bit?
> >
> > Patrick Bowen
> >
> > -----Original Message-----
> > From: John & Tracy Knox [mailto:jknox@erie.net]
> > Sent: Sunday, November 28, 1999 11:45 PM
> > To: spitfires@autox.team.net; Patrick Bowen
> > Subject: Re: Busted manifold stud (continued)
> >
> > Might I also suggest a left hand drill bit when drilling the bolt
> out. I've
> > found that the heat, friction, and the hole in the center will often
> times
> > pull the offending bolt out without then going to an easy out. Works
> as
> > often as not.
> >
> > John Knox
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"If you can't excel with talent, triumph with effort."
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