View Full Version : Atom Bomb Proof Freewheel

02-13-2008, 01:47 AM
It's been a while, but I'm finally back. This is something we talked about back then, and I can now report:

Over the years, many -- or at least some -- of us have been looking for freewheels that are stronger than the bicycle kind. For multi-person machines, Kinetic Racers, etc. Well, I have found one. It weighs six pounds and costs $167,-, but we will never break it -- it is rated for 75 HorsePower on a farm tractor or industrial engine. It fits a 1 inch shaft with standard 1/4 inch key. A local machine shop can make a sleeve/bushing/adapter to install it on a smaller shaft.

It comes from a firm named Hub City and can be seen in their on-line catalog. (I lost the link -- just google it.) Part number is 0331-00600.

The guts of the thing are similar to the agricultural six-spline PTO overrunning adapters that are available at Tractor Supply Co for half the price. Believe me, I have tried to use one of those. And failed. But this Hub City part already has a flange on it for the sprocket, and the shaft goes thru, and it fits on a normal industrial shaft!

Here are two photos -- assembled and apart. I painted the housing brown and the hub white (may look pale blue in picture).

http://i46.photobucket.com/albums/f102/Elliotn/000_0674p40.jpg (http://i46.photobucket.com/albums/f102/Elliotn/000_0674p40.jpg)

http://i46.photobucket.com/albums/f102/Elliotn/000_0669p40.jpg (http://i46.photobucket.com/albums/f102/Elliotn/000_0669p40.jpg)



You can order Hub City products from your local Motion Industries, Applied Technologies, and many other industrial power transmissions stores and machine shops. (No, I have no financial interest in this. I just want you to know that this Thingie exists.)


02-14-2008, 01:10 AM
Thanks for that info - I might be able to use that on my Arcturus project. So this is a sprague clutch then?


02-15-2008, 11:31 AM
No, it is a ratchet -- it goes "click, click, click...."

But now that you mentioned spragues, it dawned on me that automatic transmissions (in automobiles) have a sprague clutch that might -- might -- be worth investigating. I'll have to look into that!