
Carl
I learned to use left hand bits from my old high school machine shop instructor in a Bridgeport--about 45 years ago or so.  When reversable drill motors became more available, it became easier.  I have a set that is 35 years old and I picked up a new set at Portland a couple of years ago for under $20 as I remember (the guy is set up about row D-E each year with bits and machine tool accessories both new and used.  I bought a couple chucks from him.

If you think you might have to drill out a bolt anyway, just use the left handers.  I usually heat the area around the bolt a couple of times and let cool.  Then drill with left hand and sometimes it really does come out.  Worked in a T0 30 last week with 2 manifold studs that had been broken long enough to allow the manifold to burn out around them from leakage.  

A great drill press is one of the Tiwan/china mill drills that are not much as mills, but make a decent drill press and reverse.  You can sometimes find one cheap where someone bought them thinking that since they were advertised as mills, they really might hog some cast iron or steel--=ha ha.
Bear
And Farmer, is your story of Scott's success with easeout another one of those urban internet myths--will it stand up around the campfire at Portland.  Was sitting at the table in the City Cafe in Sonora Tex one day with bunch of Texas oilfield hands and a pusher for Sun Oil sat down and interrupted the conversation thusly  "Guys, I got to tell you this story and it an't no oil field story--it's the real s**t".  It really was another oil field story.  



--- "carl gogol" <cgogol@twcny.rr.com> wrote:

From: "carl gogol" <cgogol@twcny.rr.com>
Date: Thu, 29 Dec 2005 18:48:22 -0500
To: "Antique tractor email discussion group" <at@lists.antique-tractor.com>
Subject: Re: [AT] Northern Tool Sale - Left Hand drills

I am surprised that more list members have not extracted broken bolts with 
left twist drills.  I have successfully removed two broken off manifold 
bolts, one on each of my D-14s.  These are the two bolts that the vertical 
muffler brace attach to.  There is only one reason for these to break off, 
they have rusted over time and adhered to the manifold.  Actually, the first 
one was first heated with an oxy-acetylene torch.  It backed out with the 
left twist drill almost too easy.  Being fortified with success, I decided 
to try the other without heat.  Although I had to drill a second pass with a 
larger size, it too came without a lot of persuasion.  I only wish that I 
had a drill press that would reverse so as to drill a bit more securely for 
some other situations.  Maybe I'll get an old Bridgeport mill someday. 
YMMV.
Carl Gogol
Manlius, NY
AC 170D
(2) AC D-14, AC 914H
Simplicity 3112 & 7116
Kubota F-2400 


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