RS at work rogershoaf gmail.com wrote:

John Doe wrote:

2017 aluminum collar/rod
64 mm length (about 1" will be used)
22 mm outer diameter
8 mm inner diameter

The rod will be pushed into the hub of the skate wheel and the
assembly will screw onto the arbor of the cordless drill. That
looks like a more simple and efficient way to mount the wheel.

http://www.flickr.com/photos/27532210@N04/
http://www.flickr.com/photos/27532210 N04/ (sign removed)

....

OK but why 2017? It machines OK annealed but might be a bit
crumbly at the T4 temper.

Because that was available to this layman.

Also the screw that threads in might end up stripping out the
threads as you start and stop.

The current motor is not really very powerful, but I will keep
that in mind.

You shouls also consider what happens when the wheel is turning
and the motor stops, In a threaded drive like you describe it is
likely to unscrew I think.

Yes, for sure. The arbor has a reverse threaded screw. If the
arbor is long enough, the screw might solve that problem.

If you are trying to make a drive to attach a motor, why not
press in a socket to the wheel and then either use the hex or
the square end to interface with the drill motor.

Yup, in another design. At the moment, this ultralight version has
the scooter wheel attached directly to the drill arbor with no
support on the other side of the hub.

FWIW.

There is some unusual sideways pressure on the DeWalt right angle
drill arbor bearing, but that is a big bearing and it is doing
well so far. Also, this next one will have the wheel even closer
to that bearing.

Regular drills have a small bearing at the arbor, but they include
a clutch. This right angle drill has a big bearing at the arbor,
but has no clutch. A clutch would be very useful even though it
slightly increases the weight. I could use a regular drill and
have it sticking out sideways from the wheel without a right angle
gear, if the wheel is at least 7 inches diameter. That will
require a sturdy attachment to the drill case up forward near the
arbor. But they might not be as tolerant to sideways pressure on
the chuck.
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what might work pretty good is a ball
end Allen wrench that would tolerate some misalignment.

Roger Shoaf