Subject:
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Re: Some help or advice requested
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 31 Jan 2010 23:04:47 GMT
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Viewed:
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19921 times
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Here is yet another possible solution that I have found effective for something
very similar (a vehicle that reverses its direction when it hits an obstacle).
This one is purely mechanical (no electrical switch needed).
<http://www.youtube.com/watch?v=XP4zhMS79Ng#t=0m31s>
<http://www.brickshelf.com/cgi-bin/gallery.cgi?i=2300300>
The mechanism relies on the four 24t gears that you see. The left and right
ones are powered by the motor, and turn in opposite directions, towards the
centre (the left one clockwise and the right one anticlockwise). The bottom
gear is connected to the output (the wheels of the vehicle). The top gear
meshes with the bottom one and is free to pivot left or right (controlled by the
bumpers), determining which way the output turns.
Because the pivoting gear is above its pivot point, it is unlikely to stop in
the dead-centre disengaged position. And the direction of rotation means that
once in the left or right position, it is held there fairly firmly.
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Message has 1 Reply:
 | | Re: Some help or advice requested
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| (...) Hmm, I had dabbled with a similar solution, but inverted (with the motor driving the bottom gear and the two side gears the two outputs, but discarded it for reasons that escape me at the moment. I must investigate this further. Thanks! Owen. (15 years ago, 2-Feb-10, to lugnet.technic)
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Message is in Reply To:
| | Some help or advice requested
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| Hi all. I am currently working on a project (to be revealed in due course!) and I've come across something of a stumbling block. I have a tray that is constrained to move in one dimension, and a series of short liftarms under the tray, all rotating (...) (15 years ago, 19-Jan-10, to lugnet.technic)
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