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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Tue, 2 Feb 2010 09:50:39 GMT
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Viewed:
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20013 times
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In lugnet.technic, Alexander Holroyd wrote:
> 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.
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.
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Message has 1 Reply:
 | | Re: Some help or advice requested
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| (...) Yes, there are quite a few possible variations on this mechanism. There is even at least one in an official model: (URL) Hope you get it working. I always like a purely mechnical solution :) (15 years ago, 3-Feb-10, to lugnet.technic)
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Message is in Reply To:
| | Re: Some help or advice requested
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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). (2 URLs) The mechanism relies (...) (15 years ago, 31-Jan-10, to lugnet.technic)
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