Restoring Auger Bit Lead Screws

Subject:  Fixed some auger bits 
Sent:     9/25/99 9:55 PM 
To:       Old Tools, oldtools@listserv.law.cornell.edu
 
Esteemed Galoots,
 
I was supposed to be cleaning up my shop today so I can make some
shelving for our recently cleaned out storeroom when I had an sudden
urge to try out my newly acquired 3/16" Russell Jennings bit. Yep, you
don't see auger bits with just a '3' stamped on them every day.
Anyways, faster than you can say 'severe avoidance behavior', I got to
fooling around and eventually dragged out a #12 auger bit with a fine
lead screw that was perfectly good in every respect save that the lead
screw was a real jammer. Every time I tried to use the danged thing,
the bit would stop pulling itself through the wood and the threads of
the lead screw would end up tightly packed with wood.
 
The threads on this bit were a little rough and the grooves had some
rust in them, although were not pitted. I had previously tried a
couple of different approaches to cleaning out the threads but to no
avail. I was thinking how my best auger bits have polished threads
that aren't overly sharp. These bits work well and never jam. It
occurred to me to try some gentle filing to straighten out the worst
threads followed by drilling into wood treated with buffing compound.
I gently filed the roughest of the threads with an X-acto 1/2 round
needle file, the only file I have that could get into the grooves at
all, and drilled the beginning of a hole in maple scrap. I drilled the
hole until the screw was about half buried, backed out the bit, forced
some emery (gray, gritty) buffing compound into the hole and stuck the
bit back in. I advanced the bit until the screw was buried and the
spurs were beginning to cut and backed it out and in several times.
After about 30 seconds of this, I backed the bit out and examined the
threads. Not bad! I repeated the procedure with a fresh hole and
checked again. The threads were smooth and polished. I tried the
rehabilitated bit out on some fresh scrap and it worked well - no
jamming. I had a couple of other bits in the 'loser' pile, both
jammers, and the procedure worked on them.
 
Anyways, I guess I ought to get back down there and finish cleaning
up. Guess I can cease my endless searching for a backup #12 auger bit
now. 
**************************** 
Tom Price (TomPrice@aol.com) 
Brakes For Rust 
 

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Last revised 11/20/99