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Here are some pics of a technique I've used for many years, driving a technic
axle from a 12V train motor:
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=187797
Before the advent of the RC Car motor, this was the most power that could be
obtained from a single LEGO motor and used on a Technic axle, 12V at 0.667A = 8
Watts.
Years ago I built a tank-drive robot that used two of these mechanisms to drive
82mm wheels via a further speed reduction of 8:24. I thought it so good that I
might rebuild it sometime.
I also used four of the mechanisms, one on each wheel, with 16:24 chain drive
and 68mm wheels from the Big Cat truck to drive a chassis over a duvet - a lot
more difficult than over a smooth floor or carpet. The chassis successfully
climbed a pillow at a steep angle. Unfortunately, the 32W of power required,
supplied by an old computer switch mode power supply (12V at up to 6A), melted a
pole reverser switch :-)
It would be interesting to see how this mechanism compares against the other
motors that Philo has measured for performance:
http://www.philohome.com/motors/motorcomp.htm
Mark
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Message has 1 Reply:
 | | Re: Motor Technique
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| (...) We don't know the efficiency of this setup... but it looks interesting! (...) I noticed too that they are somewhat... fragile. (...) Unfortunately I don't have this motor in my collection (yet...) Philo (19 years ago, 12-Jun-06, to lugnet.technic)
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