Alt-BEAM Archive
Message #04880
To: beam@sgiblab.sgi.com
From: JVernonM@aol.com
Date: Sat, 26 Jun 1999 16:17:37 EDT
Subject: [alt-beam] Re: Photopopper problems
In a message dated 6/26/99 3:59:14 PM Eastern Daylight Time,
anderson@cfht.hawaii.edu writes:
> I striped some funny hard rubber things from
> cassette players, that I thought would make great wheels, but the problem
I'
> m
> having is that they only turn when not touching the ground
Hi James,
The problem you are having is with the torque strength of pager motors, i.e.,
they have none. If you put ANY kind of wheel on the shaft, you must raise the
capacitance very high. I put two 4700uF caps in Trundle, and he still takes
small steps. The wheel on him is the same diameter as the pager motor. In
your set up, you are better off to remove the wheels and run the bot on the
motor shafts. Or, you can stick about 5000 more uF's on your capacitor bank
and put up with a longer charge time.
Jim
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