Side Project Questions: What Steel?

[martin417]

Originally Posted by CraigHickman

We've got a 200lb rider (safety gear is heavy) going 60mph down a hill, and the rider attempts to do a 90 degree turn at that speed....

OK, I see what your problem is, and I have a solution that I guarantee will work. Go to your local psychiatric hospital, and have yourself committed to the suicide prevention ward. With a few years of intensive therapy, and probably lots of drugs, maybe a few electroshock treatments, I am confidant that they can expunge your death-wish. Otherwise, why not fling yourself in front of a train, it would be faster.

[Dick Linn]

I'm not sure if a "shoulder bolt" AKA "stripper bolt" would work for you or not. The threaded portion is smaller than the ground portion of the body, so it may concentrate stress if it isn't designed correctly. Unbrako and Holo-Krome both make quality fasteners.

For experimentation sake, you might see if you can use a stud made from "stressproof" steel or 4140 chrome-moly alloy. ENCO has some Gibraltar cut-thread studs on page 764, and maybe the outside diameter would fit your bearings. You could at least try something like that and do a lot of jumping up and down on it before daring to do any road testing. Cantilevering a decent load a couple inches out on a 5/16" bolt may be pushing it. Maybe you could put one of your trucks on a handtruck-like arrangement and tow it behind a vehicle with a 300 pound sandbag on it. See how it holds up.

http://www.use-enco.com/CGI/INPDFF?PMPAGE=764