Thought you guys might find this interesting...
For one of my introductory engineering courses, I and two other people
have to design and build a robot capable of foward motion over various
terrains using two servo motors (cyan). The catch is that the servo
motors only output 180 degrees of motion, leaving us to try and figure
out how to convert this into circular motion. The design I came up
looks like a tank and uses gears (red) and ratcheting treads (yellow) to
keep the robot moving foward on both cycles of the servo motion. The
wheels attached to the gears (transparent dark orange) have to be
semicircles or else they would coincide. I can get away with with that
because the motors only rotate them 180 degrees anyway. There's more
about it at http://www.creativemechatronics.com
I modeled the design in Rhino and then exported for a pretty POV-Ray
rendering to give my class a visualization of our project before we
build it. The tread and the wheels coincide which is why the wheels
bleed through the tread. I didn't bother taking the time to slightly
offset the tread.
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