"Grumpy" wrote:

"John Doe" wrote in message

I need to propel a 6 inch wheel at about 5 mph. So I need a
cordless drill or any light cordless tool that is geared to
about 400 rpm. Unfortunately, the thing cannot include a device
that causes lockup when the trigger is released and forward
pressure appears on the drill shaft.

Why not purchase an over-running clutch bearing. They are
identical dimensions to a standard bell bearing, but transmit
torque in one direction only. In the other direction they are a
free running bearing. They are usually about 50% more expensive
than an equivalent bearing. They are readily available here in
Australia, so you should have no trouble locating one at any
reasonably good bearing supplier such as SKF or NSK

I've spent money on that route before. Difficult to match attributes
include environmental contamination, locking torque, and inner\outer
diameter. I'd love to use clutch bearings, but so far no go. I might
try again.



--
The first big front wheel rollerblades.
http://www.flickr.com/photos/27532210@N04/2565924423/