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Old 08-19-2012, 12:26 PM   #1 (permalink)
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Dissasembly of a SS-25 bolt?

I'm stripping down a SS-25 to get it ready for anodising. All the other parts are allready done, but it seems the pin that joins the delrin front and the aluminum back does not want to budge... Any idea's? I've tried pressing it out under the drill press, tried tapping with a drill bit, no movement at all.

I could just drill it out, but over here in the metric part of the world it will be hard to find a matching pin.. Masking is an option i really don't want to use, since the mask has to be removed by paint thinner, and i think that will not go well with the delrin.
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Old 08-19-2012, 12:42 PM   #2 (permalink)
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It should be just a spring (split) pin.

We have a fixture that has a matching radius of the bolt.

Then we press them in with a small bench top press.

We drive them out with a pin punch about the same diameter as the pin.

If you use a smaller diameter pin that goes in the hole of the pin you will spread it open and it won't come out.
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Old 08-19-2012, 02:17 PM   #3 (permalink)
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It's indeed a spring pin, didn't know how it was named in english... This seems something i will have to do at work to do right, thanks for the speedy reply!
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Old 08-19-2012, 04:57 PM   #4 (permalink)
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Here is what I did once - right diameter pin (I actually turned down some steel a little on a lathe) and then made some wooden jaw covers for my bench vise - I drilled a small hole in one wooden jaw cover and used the other normal metal jaw cover - lined everything up and then simply closed the vice slowly. The pin was placed in the wooden jaw cover (magnet took it out) and everything was fine.

I don't have a press - so I had to do it the hard way. A press would make this super easy with the right sized pin.

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Old 08-20-2012, 11:04 AM   #5 (permalink)
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The pin's out! At work i found a small block of steel that had a hole drilled trough it just a tad bigger than the bolt. Then i drilled a 3mm hole trough the block, and drilled one hole a bit bigger to make sure the pin had enough clearance, and with a few taps with the rear of the same 3mm bit it came out perfectly! 1/8" = 3,175mm, so that was close enough. Why that didnt work with my own drill bit is now pretty obvious... That one has a chamfer on it so it wants to press the pin outwards.
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Old 08-21-2012, 09:03 AM   #6 (permalink)
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Good deal Fixel. I can't wait to see the marker. Props to my wooden shoe wearing breatheren.

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