Thread: Removing a mis-aligned roll pin

For future reference - crude, but it works wonders:

Frank.

Hi ned,

A bit late in the piece with my response but I too have had to deal with a mis-aligned roll pin. It was one of the first times I had ever dealt with or removed one. It seems to me that all roll pin holes are off centre which I did not realise until replacing and getting it most of the way in. I tried a few solutions such as the vice grips a pin punch from the other end (this found it's way either inside the pin or between the pin and the hole and added to the problem) I ended up butchering the thing to get it out. I never tried drilling it out though as I assumed they were hardened. I like the vice grip "bead breaker" that looks good!

Simon

On a side note. I think they often dont even try to get the pin in the middle. While I'm sure it can be done it would be a pain and if you got it "almost" right that would make it harder to be sure with was the right way around.

Stuart(the guy that managed to damage a machine driving a 1/2" dowel pin home that "almost" lined up. Not my best day )

All a bit academic now but another method that can work here is to fill the hole through center of the pin with grease, insert a pin punch with a diameter as close as possible to the hole and give a hit with a hammer. As long as the hole is completely misaligned and blind then the pin will hydraulic out.
The same technique works when removing bearings and bushes from blind housings.
Cheers,
Greg.

I was reading that some makers insert a shear pin in that locaton. If the leadscrew or drive shaft jams , the pin will shear and thus save other parts like gears from damage .

Mike

Never seen a roll pin in that position before. Have replaced a couple of taper pins for the feed shaft before.
Don't forget, you can get hardened roll pins as well.
Lucky it was a soft one to be drilled out.

Originally Posted by Clubman7

Never seen a roll pin in that position before. Have replaced a couple of taper pins for the feed shaft before.
Don't forget, you can get hardened roll pins as well.
Lucky it was a soft one to be drilled out.

Yes, that's interesting, I don't know how you tell the difference between a soft and hard roll pin, short of trying to cut or drill it. Maybe they use soft ones in this situation so they will shear if necessary.

(EDIT. Whilst mine did drill out easily, I did happen to have a cobalt drill of the correct size, which I used, expecting the pin to be hard

Cheers,

Ned

I would just push it out using a pin punch form the opposite side.

Roger

Originally Posted by rogerbaker

I would just push it out using a pin punch form the opposite side.

Roger

Sure, That's the way to do it if you can, but here we are talking about a pin that is mis-aligned such that the pin can't be got to with a punch from the other side. i.e. the hole wasn't drilled exactly in the centre of the shaft and it's collar, so if it is 180 deg out, then not all holes line up.

Originally Posted by franco

For future reference - crude, but it works wonders:

Frank.

Cool. Thanks.

Cheers,
Joe