I have a metal coupler about 3" in diameter with a shaft through it. The
coupler is at the end of the shaft of a motor, and is about 15 pounds.
The motor is parallel to the bench it is on. There are two Allen screws
that are separated by 135 degrees screwed into the coupler. I can not
get either of them out. I'm using a 1/8th inch Allen wrench and do not
want to break it.
I tried using penetration oil to dislodge the screws, but to know avail.
All of the above are good suggestions. I'm prone to heat with the
penetrating oil. Spray oil, then heat coupler. The expansion will allow
the oil to set in. Then do as suggested with back and forth (or righty
and lefty), breaking it loose.
Spraying, heating then leaving it over night is another option as well.
Can you find a straight, screwdriver-style allen?
I've had success with stubborn screws by simulating an impact
wrench--grab the handle and twist as hard as I can, and with
the torque still applied, smack the end of the screwdriver with a hammer.
On Sun, 28 Jul 2013 17:05:04 -0700, W. eWatson wrote:
I only know the classic top-ten solutions to stuck nuts & bolts:
1. Penetrating oil (you used that already)
2. Tapping (because kinetic friction is less than static friction?)
3. Heat (expansion and contraction may break chemical bonds?)
4. Leverage (a longer stronger allen key can move the world)
5. Impact drivers (I don't see how you can fit them in here though)
6. Screw extractors (I don't see how you can drill the center though)
7. Nut crackers (I don't see that you can crack the head here though)
8. Oversized tools (which works when the heads are stripped)
9. Saws (to cut off the head of the bolt)
10. Drills (drill out and retap the bolt hole)
Given your situation, I only see the first 4 standing any chance
of fitting in your narrow confines.
On Sunday, July 28, 2013 7:05:04 PM UTC-5, W. eWatson wrote:
coupler is at the end of the shaft of a motor, and is about 15 pounds. The
motor is parallel to the bench it is on. There are two Allen screws that ar
e separated by 135 degrees screwed into the coupler. I can not get either o
f them out. I'm using a 1/8th inch Allen wrench and do not want to break it
. I tried using penetration oil to dislodge the screws, but to know avail.
I would heat it fairly hot and then spray WD40 or the penetrating oil on th
e screw threads. As the setscrew cools, it will pull the WD40 into the thr
eads. I usually use a Bernzomatic torch or equivalent to do the heating, j
ust do not get the coupler so hot that it loses its temper, if any. A coup
le of heat and extrme cooliing cylces usually breaks almost anything free
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