Believe it or not you can buy drill bits that will go right through that
broken extractor. I bought a set of them at the San Diego Fairgrounds about
a year ago. I watched the guy repeatedly drill through a file, all without
any cooling fluid.
Anyway, he also drilled right through taps, stainless steel, etc. Here's
part of the secret of using these drill bits. You need to turn them at the
highest possible speed. I have a drill press that can be belted up to 3,000
rpm. It goes right through the hardest material you can imagine. As I recall
I paid about $90 for a set from 1/8 inch to 1/2 inch in 1/8-inch increments.
Was well worth the price since I recently had to drill three alignment holes
in a 16-inch diamond saw blade for my son's granite cutting saw. If you'd
like more information I can get it for you.
Problem in your case is that you'd have to get a really high speed drill
motor in order to get proper speed on the bit. Also, the bit really smokes
and screeches when you begin drilling but it soon starts cutting right
through the material.
One other thing, I did have to drill out a broken 1/4-20 tap I'd broken off
in a piece of steel and the drill went through it almost like butter! Hard
to believe but true.
"Believe it or not you can buy drill bits that will go right through
broken extractor. I bought a set of them at the San Diego Fairgrounds
a year ago. I watched the guy repeatedly drill through a file, all
any cooling fluid. "
While these sound like a wonder tool, do you think they will really
work to actually drill out a relatively small broken screw extractor
lodged in a bolt in the backside of a wheel spindle? That's a lot
different than drilling through a flat file on a bench. In addition to
being able to hold the drill securely, the other problem is that what
you're trying to now drill out is pretty damn small and irregular. The
drill will typical wind up in the area betweent the broken off
extractor and the bolt, then jamb and break.
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