Alt-BEAM Archive

Message #03581



To: Dennison dennlill@buffnet.net
From: Bruce Robinson Bruce_Robinson@bc.sympatico.ca
Date: Sun, 23 May 1999 15:04:35 -0700
Subject: [alt-beam] Re: Rolling wheel design.


Dennison wrote:

> When making a rollerbot, one has to think of how the device will turn.

Here's a thought. A flat triangular platform placed inside a transparent
sphere, so it is supported by its corners just a little below the
centerline. A weight is rigidly attached below the very centre of the
platform, as close as possible to the bottom of the sphere without
actually touching. On one of the corners of the platform is a small
caster that can roll in any direction. On the other two corners is the
shaft of a small motor (coated with a friction material). Power it as
you see fit. Photocells determine which motor runs.

The motors are arranged so they will try to "crawl down" the insides of
the sphere. This tilts the platform so the weight swings away from the
motor, moving the centre of gravity forward. The ball rolls away from
the motor.

Upside: simple, directional, and it can probably handle moderately
uneven ground.

Downside: the inside of the sphere has to be absolutely smooth.

If anyone wants to try it, I'd be very interested in your results.

Regards,
Bruce

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