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The Folding Knife (& Switchblade) Forum The materials, techniques and the designing of folding knives.

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Old 07-25-2014, 05:57 AM
irishknifeworks irishknifeworks is offline
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Pivot Trouble

I'm have repeated pivot problems with my slipjoint folders. Everything works perfect until the final assembly. Once I peen the pivot pins into the bolsters, the blade binds up and is extremely difficult to open and close. It's not the spring. It works perfectly in all my test fits. The blade "clicks" into open and closed position without a hitch. But once I peen the pin, and I'm past the point of no return, I have a pivot that feels like it hasn't been opened in a thousand years and the "click" no longer exists.
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Old 07-25-2014, 09:26 AM
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Don Robinson Don Robinson is offline
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You must stop peening before the blade seizes up. As you peen, keep moving the blade to see if it is getting tight.
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Old 07-25-2014, 10:19 AM
irishknifeworks irishknifeworks is offline
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Thanks. I feel kinda stupid that I didn't already think of that. Just ordered your slipjoint book by the way.
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Old 07-25-2014, 11:12 AM
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cnccutter cnccutter is offline
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Don't fret. Most Slipjoints makers have a few folders that are realy stiff to open from over preening. I look at mine to keep me humble when things are going good. You can save the folder by drilling into the pin partway with a smaller drill bit and drive it out. Clean up the pin holes and try it again. Practice and patience are the key words of the day.

Erik

Ps. might want to fill out a little of your profile so we can get to know you.
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Old 07-25-2014, 11:23 AM
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joneill joneill is offline
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One thing that I have started doing, is to put a flat piece of steel, the same thickness as the spring into the opening where the blade will rest when closed. This will keep the side plates parallel and help keep the blade from binding when closed. Also, I put a shim up by the pivot pin, peen until that is snug and then take it out and adjust with carefully placed strikes. You are probably already doing this but make sure the width of the blade pivot area is parallel and just a touch narrower than the spring. It sucks cuz just one too many hits really affects the walk. I have gotten really good at drilling out the bad pins. lol


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Old 07-25-2014, 12:04 PM
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Don Robinson Don Robinson is offline
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Very good advise from Erik and Joe. I've had to drill out pivot pins too.
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Old 07-25-2014, 03:47 PM
irishknifeworks irishknifeworks is offline
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Thanks guys. You've helped me a lot. I'll try to get my profile filled out.
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Old 07-25-2014, 05:47 PM
Craig B. Craig B. is offline
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Take a feeler gauge of .001 or .002 and slot it to fit around the pin. Insert between bolster and blade around the pin, one on each side. Peen and then pull out the feeler gauges. It will help keep it from locking up tight.


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Old 07-25-2014, 06:52 PM
argel55 argel55 is offline
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Take a piece of heat treat foil,double it, and put it between the blade and liner. Make sure you have the blade in the half open position the give more support to the liners. Pein carefully.
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bee, blade, bolster, bolsters, drill, flat, heat, heat treat, knife, knives, make, pins, pivot, profile, steel, thickness


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