Removing a "roll pin"

[Bob_Skurka]

Removing a \"roll pin\"

I've got a new 914A MMM. The discharge chute deflector is coming off because it is in the way. It is held down by a heavy spring, the spring is held in place by a shaft that is pinned into position with a "roll pin" on each end.

I cannot get either of the roll pins out. I can tap them so they are they move part way, but when I try to grab the other end with a pair of pliers to pull them out the rest of the way they won't budge.

What is the trick?

 

[Bird]

Re: Removing a \"roll pin\"

Sounds normal for roll pins to me, Bob. I had to remove and replace many, many roll pins, working on air tools and I always used a punch slightly smaller than the roll pin. Tap the roll pin with a small hammer until it's flush on one end, then use the punch to drive it on through. That's the reason you need a punch smaller in diameter than the roll pin. Just for working on air tools, I think I had 4 different sized punches for roll pins.

 

[Bob_Skurka]

Re: Removing a \"roll pin\"

And if I don't have a punch of the proper size???

 

[NIXON]

Re: Removing a \"roll pin\"

Bob this probably isn't the best method . But it's worked for me in a pinch . Use a drill bit of the proper size as a punch . John

 

[DavidJ]

Re: Removing a \"roll pin\"

Run down to your local harbor freight and buy a set of pin punches /forums/images/graemlins/grin.gif .

I have used the drill bit method as another suggested, or you can also try a bolt smaller than the bore. once you drive it through the drill or bolt will slide back out because they don't expand like the roll pin does.

 

[jimg]

Re: Removing a \"roll pin\"

A nail could be used

 

[Bird]

Re: Removing a \"roll pin\"

</font><font color="blue" class="small">( And if I don't have a punch of the proper size??? )</font>

In that case, and if you can't pull hard enough with a pair of pliers, then you get your wire cutters, grip the roll pin with the back of the jaws right against whatever the roll pin is in, pry up a bit, change the grip, pry again, and continue until you pull it out. And if you grip too hard and cut the roll pin in two, then you go shopping for a punch the right size as well as a new roll pin. /forums/images/graemlins/wink.gif /forums/images/graemlins/laugh.gif

 

[jinman]

Re: Removing a \"roll pin\"

</font><font color="blue" class="small">( then you go shopping for a punch the right size as well as a new roll pin. )</font>

Bird, someone else called the punch a pin punch, but aren't they also called a drift punch? I don't know for sure which is the proper terminology, but if Bob uses both names surely he'll end up with the right tool.

I've used the drill bit method, but bits are so hard they can easily break/shatter, and so you need to be a little cautious. The nail works also, but it's problem is normally just the opposite of the drill bit. It's too soft. Whatever you use needs to be as flat as possible. If you use a pointed object, it just expands the rollpin and makes it tighter in the hole. /forums/images/graemlins/tongue.gif

 

[have_blue]

Re: Removing a \"roll pin\"

</font><font color="blue" class="small">( A nail could be used )</font>

That's what I use in a pinch. I grind off the point, because a point can spread the roll pin, causing it to spread and get very tight.

 

[Bird]

Re: Removing a \"roll pin\"

Yeah, I didn't think to mention that. You do want a flat face on the punch and bigger than the "hole" in the center of the roll pin. I'm not sure where the names came from like pin punch and drift punch, but that's what they're called. And of course, the punch needs to be of uniform diameter at least as long as the hole the roll pin is in, rather than being a tapered punch or pin. I see that Matco Tools has a real nice set of 9 sizes. /forums/images/graemlins/laugh.gif Of course, that's a little more than most of us need.