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Tool Talk Discussion Forum

Removing a hardened roll pin????

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Mark/Ks

11-01-2007 09:14:10




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I have been trying to remove a hardened roll pin, and having trouble.. In the past I have had luck, just drilling them out. But with this one, I have beat it, sprayed it, and drilled for about 30 minutes on it.. But nothing I try will get this thing to break loose,, I dont want to heat it, since oil lines are about a inch away.. What do all you pros do??? What would be the best, hardest drill bit I can buy?? Thanks....

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Spritzer

11-05-2007 05:11:55




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 Re: Removing a hardened roll pin???? in reply to Mark/Ks, 11-01-2007 09:14:10  
Use pin-punch exactly the size of the pin. Make sure the end is ground completely flat to the outer edge, otherwise the "rounded" shape will only tend to mushroom the end and make it tighter. And use a hammer heavy enough to "drive" the pin, rather than "peen" it.



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Robert Beahm

11-03-2007 09:07:16




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 Re: Removing a hardened roll pin???? in reply to Mark/Ks, 11-01-2007 09:14:10  
I have an 1/8" roll pin that has moved out about 3/16" of an inch using a tapered starter punch. I am now using a 3/32" pin punch with a flat nose and having no luck after having broken three of them. The punch is now stuck in the pin that I had earlier tried to drill out - unsuccessfully. Where do I go from here?



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Mark/Ks

11-03-2007 17:50:01




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 Re: Removing a hardened roll pin???? in reply to Robert Beahm, 11-03-2007 09:07:16  
Robert,, You are in worst shape than I am. I think i will remove the piece from the tractor and put it in a vise, and that way I can use a BFH on it!!!!



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cwtech

11-02-2007 08:09:49




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 Re: Removing a hardened roll pin???? in reply to Mark/Ks, 11-01-2007 09:14:10  
It sounds like you may possibly be trying to drive a sheared, or partially sheared, rollpin.

If the holes through two parts are not in alignment, the rollpin has nowhere to go.

If you can see thru the hollow roll pin, then it should move with a punch. ....If you can not see through it, then more than likely, the pin has sheared.

Terminology also differs by region. ....To me, a rollpin is a hollow pin, sometimes called a springpin. ....I have heard some people refer to a dowel pin (solid) as a rollpin.

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msb

11-01-2007 19:57:09




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 Re: Removing a hardened roll pin???? in reply to Mark/Ks, 11-01-2007 09:14:10  
Do yourself a big favor and buy a set of roll pin punches.



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msb

11-01-2007 19:57:01




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 Re: Removing a hardened roll pin???? in reply to Mark/Ks, 11-01-2007 09:14:10  
Do yourself a big favor and buy a set of roll pin punches.



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Tim B from MA

11-01-2007 12:14:09




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 Re: Removing a hardened roll pin???? in reply to Mark/Ks, 11-01-2007 09:14:10  
I agree with JMS. Wrap the oil lines in wet rags, if possible put a piece of metal between the oil lines and the heat, and apply heat punch



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the tractor vet

11-01-2007 11:16:27




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 Re: Removing a hardened roll pin???? in reply to Mark/Ks, 11-01-2007 09:14:10  
I have never had a problem removing a rll pin if ya use the wright way of doing it . ON the really stuck ones i start off with my Snap on drift punch first and a small 4 lb hammer adding a bit of Zep penatrating fluid first then fallow up with my roll pin punches . I never start with the roll pin punch first as they will not deliver the force needed to break it lose . The Snap on punches i bought years ago are the BEST that i have ever found and i only winnneeeed about the price once and 35 years later they are still doing the job and oh yea only had to have one replaced , handed to the Snap off tool man hand he handed me a new on .Gave over a 100 bucks for it back then and that was money well spent.

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JMS/.MN

11-01-2007 10:55:51




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 Re: Removing a hardened roll pin???? in reply to Mark/Ks, 11-01-2007 09:14:10  
If oil lines are close, can you insert a thick steel plate as a heat shield, hit the pin with a torch for a short time? That oil line is not going to burst into flame or be melted soon, assuming it is metal, not hose. Even if hose, and the plate is 3/8 or so, takes a long time to damage the hose. Wrap the line with wet paper, insulation, etc.



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TimV

11-01-2007 09:52:35




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 Re: Removing a hardened roll pin???? in reply to Mark/Ks, 11-01-2007 09:14:10  
Mark: If drilling is your best option (which I can't comment on, not knowing where the pin is installed), you can sometimes get lucky with a carbide-tipped masonry drill. You can also buy solid carbide drills, but they're expensive and VERY brittle--best used in a rigid setup like a milling machine or a drill press, not for freehand drilling.



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