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#1
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![]() "Paul P" REMOVE paul @ REMOVE ppinyot . REMOVEcom wrote in message ... Product Linear Temperature Expansion Coefficient - ?- (10-6 m/m K) (10-6 in/in oF) Aluminum 22.2 12.3 Steel 13.0 7.3 from: http://www.engineeringtoolbox.com/li...ents-d_95.html Looks like the aluminum will expand greater than the steel when both are equally heated. Paul P. Now, does the expansion of the knob make the hole larger or smaller? My instinct is that all dimensions get larger, hence the screw should be looser. Or maybe the answer is some dry ice or liquid nitrogen. (That's only half kidding). -- -- Richard Knoppow Los Angeles WB6KBL |
#2
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Now, does the expansion of the knob make the hole larger or smaller? My
instinct is that all dimensions get larger, hence the screw should be looser. Or maybe the answer is some dry ice or liquid nitrogen. (That's only half kidding). Richard Knoppow Los Angeles WB6KBL I think that since the metal shrinks when colder, an inside diameter will get larger and an outside diameter will get smaller too. It's all shrinking, not collapsing on itself. Barry - N4BUQ |
#3
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It is probably so galled that you won't get it off without having to retap
anyway. Too bad you can't just work around it. Bummer |
#4
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On Jan 13, 9:11*pm, "JB" wrote:
It is probably so galled that you won't get it off without having to retap anyway. *Too bad you can't just work around it. Bummer -- heating the Allen wrench with a heatgun while engaged with the setscrew and turning -- heating the Allen wrench to 450 degrees and then inserting it into the setscrew and turning No wonder the wrench bent ! .. you need to heat the alloy knob with the heat gun .. as hot as you can get it .. with the hole to the top so you can drip some thin oil in ... then if you like chill the wrench ... and have a go ... your lucky the hex key still gets a grip .. .... need alloy as hot as possible screw as cold as possible slight nip clockwise first may break the bond G .. |
#5
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Graham wrote:
JB wrote: It is probably so galled that you won't get it off without having to retap anyway. Too bad you can't just work around it. Bummer -- heating the Allen wrench with a heatgun while engaged with the setscrew and turning -- heating the Allen wrench to 450 degrees and then inserting it into the setscrew and turning No wonder the wrench bent ! .. you need to heat the alloy knob with the heat gun .. as hot as you can get it .. with the hole to the top so you can drip some thin oil in ... then if you like chill the wrench ... and have a go ... your lucky the hex key still gets a grip .. .... need alloy as hot as possible screw as cold as possible slight nip clockwise first may break the bond G .. Dunno if this'd work but, Locktite "High Strength Thread Locker" is pretty strong stuff. It's strong enough to lock the ½" diameter engine cylinder head studs in my racecar's engine. Perhaps you could "glue" the Allen wrench into the setscrew (being careful to not get any on the threads), let it cure overnight, and try breaking the screw loose afterward. See http://tinyurl.com/9zvre5 to see which one might be "bestest". Poor quality (soft alloy steel) Allen wrenches will twist/bend... start with a good quality Allen Wrench. Use heat to release the thread locker. If *that* won't do it, I think you'll be drilling the screw out and retapping to the next larger size. vy 73, Bryan WA7PRC |
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