#4 Rider Bushing Replacement

Hello all. I was fortunate enough to attend Paul’s workshop in Chicago last week and learned a great deal, but the one thing I was unable to retain is what exactly the process is for fixing these missing (broken?) bushings in my riders.

As I understand it, there are taper pins holding the assembly together, but they’ve been smoothed down on the small end, so removing them isn’t simply a matter of tapping them out, right?

Paul also indicated that this might be a job for a local machine shop – any ideas where in Chicago might be a good place to start? What exactly should I tell them?

Lastly, once I get the assembly apart, how do I get the bearings into the rider roller?

I’m attaching photos to confirm the problem, but I don’t think there’s much mystery here.

Thanks!

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David Black
David Black
13 years ago

The bottom, but measure them with a caliper, to see the difference. It is not great only a fraction of an inch. You need to be extra careful to get it all back together correctly ‘right round’ or you will ruin it.
So, be sure you double check with a measuring device before you start if the small and large ends are not apparent to you.
Make sure your pin punch size is exactly the small ends width and is, in fact, a pin punch – straight shaft without an increasing taper.

David Black
David Black
13 years ago

You can use a heat gun too, if fire is too scary.

I just did this exact job and I found that the bushing seats on the riders were fine and the shafts were okay too (after removing some rust and straightening).

Hooray for lesser metals!

Once you get it apart, measure everything with a vernier caliper and see if you get a variance. I was able to use bushings from a donor – I used the freezer/heat trick to install them like a piston wrist pin.

it’s not too hard.

Eric Holub
Editor
13 years ago

The problem is that the riders and their shafts are now worn unevenly and the holes may need to be re-bored on a lathe, and bushings made to fit the new dimensions.
I don’t know what the originals were, but impregnated bronze bushings that don’t need oiling are a possibilty for replacement.
Removing taper pins shouldn’t be a problem if you use the largest pin punch that will fit, and drive out from the small end. Using a smaller punch or driving from the large end will be a big problem; either will deform and jam the pin in place. Then it will need drilling out, or sometimes a torch can be used to expand the material and loosen the pin. And those are best left to the experienced machinist.

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