Trad Gang
Main Boards => The Bowyer's Bench => Topic started by: J. R. Harp on August 27, 2016, 12:27:00 AM
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Just bought a used takedown longbow and one of the pins is sunk in too deep to do much good. Seems to be stuck in real good. Any suggestions on how to get it out? Thanks
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It depends what it was glued in with. Most epoxies will release with heat but how much heat is the question. If they used MT13 it may well be in for good.
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It only needs to stick out one and a half its diameter to hold its maximum shear load. Now whether or not its gets into the limb far enough, I don't know.
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If nothing else work you could drill a hole in the pin and try to screw in a pointed threaded screw and try to twist it loose. There is a special tool for this, I do not know the english word for it, but translated from Norwegian it is pig dick. :)
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The tool looks like this.
https://www.rcpro.no/detaljer/LU0503-0200/skrueuttrekker-sett-1-6-grisepikk
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I have so far always been able to pull them with a set of vice grips. If the pin is knurled it will be much harder. If using heat put some sort of heat sync on the pin so you don't have to heat he pin directly. I use a bolt as a heat sync when pulling the threaded inserts. Good luck.
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Originally posted by PEARL DRUMS:
It only needs to stick out one and a half its diameter to hold its maximum shear load. Now whether or not its gets into the limb far enough, I don't know.
This is a great point. The sort of insight yu only get from a machinist. Consider this though, the maximum shear load of the pin is probably 10x that of the maximum load before the pin rips out of the riser.
My point is it probably doesn't take much of that pin to do all you need.