Subject:
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Mechanical obstacle avoider
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 13 Dec 2005 07:42:12 GMT
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Viewed:
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4791 times
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Everyone makes a Mindstorms robot that drives forward until it hits an obstacle,
then reverses and turns for a short distance before resuming its forward motion.
Here is a robot that does the same by 100% mechanical methods. It has only one
motor, which always turns in the same direction, and there are no electronic
components. At first I wasn't sure if this would be possible or practical, but
it actually works quite nicely.
http://www.brickshelf.com/cgi-bin/gallery.cgi?m=aeh
http://www.brickshelf.com/gallery/aeh/Obstacle/movie/obstacle.avi
http://www.brickshelf.com/gallery/aeh/Obstacle/ldraw/obstacle.ldr
The most difficult part was making it reverse for a set distance. When it is
reversing, a pivoting arm moving with the drive wheel presses against an axle
and pushes it against a rotating worm gear, causing the axle to slowly retract
until it is out of the way of the arm, then the robot can resume driving
forward. (Probably the only way to make sense of this explanation is to try
building it!)
For the next challenge, how about a skid-steer version or a pneumatic
version...?
cheers, Alexander
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Message has 2 Replies:
 | | Re: Mechanical obstacle avoider
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| You are awesome. I had read about this in some lego paper about gearboxes, specifically shiftable ones. It said the problem was keeping the car in reverse for a while instead of jittering back and forth. Now I -really- want to get into the (...) (18 years ago, 13-Dec-05, to lugnet.technic)
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