Subject:
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Re: Synchro drive in Lego
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 14 Jan 1999 15:42:50 GMT
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Original-From:
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Paul Speed <[pspeed@]antispam[augustschell.com]>
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Viewed:
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1370 times
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Mark Tarrabain wrote:
>
> Paul Speed wrote:
>
> > ... For example, motor forward drives the wheels to move
> > the platform while motor reverse rotates the wheels.
>
> Hrm... how would you manage that?
>
> I cannot think of any purely mechanical approach that could do the
> trick.
Well, apparently, neither can I. :) Or I would have done
it and posted it. :) I played with some stuff last night that
ended in a dead-end. I'm not really sure the approach is fruitless,
but I'm realizing as I go on that I'm much less creative as a
mechanical engineer than I thought I was.
I'll try to explain what I fooled with while I was watching
the Simpson's last night. (That can be my only excuse for the lack
of forsight in this desing.:) )
I started out just looking for a good way to drive the
wheel at the end of a rotating assembly without having to have
one of those fancy turntable thingies. What I ended up with was
something like this:
I = vertical axle.
* = medium size gear (not sure how many teeth)
B = beam
= = spacer
- = horizontal axle.
W = wheel
P = plate
+ = those little right-angle mesh gears like used in the differential.
I
PPPPPPPPPPPPPPPP
I
I =
***** *****
BBBBBBBBBB
I B = B
I B B
I B B
I B B
I B B
I B B
I B B
BBBBBBBBBB
+++ B W B
+B W B
+B-W--B
+B W B
W
So, if the assembly is locked to the plate then the wheel
is driven. If the assembly is not locked to the plate then the
wheel is turned. If anyone is interested I can post pictures
before I rip it apart and try something else.
My original thinking was to try and figure out a way to
get the whole assembly to want to drive rather than turn without
any linking to the plate. (Unfortunately, even with enough
resistance in the rotation I think it would be impossible to
reliably predict that it wouldn't rotate.) If that worked then
a simple ratchet would make one direction turn the assembly and
another direction drive the assembly.
Then the Simpson's ended, I realized I couldn't think
of a way to procede, and I plowed the lego back into the box
top to play with later.
Maybe this will spark someone's imagination with a solution.
It seems like it would be a piece-thrifty solution if someone can
make it work.
-Paul (pspeed@augustschell.com)
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: Synchro drive in Lego
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| (...) could you not (I haven't tried this!) use a ratchet on the assembly so that axle rotation one way turns the assembly, and the other way drives the wheel? Stuart -- Did you check the web site first?: (URL) (25 years ago, 14-Jan-99, to lugnet.robotics)
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