Robotics : 3283


Robotics / 3283	3282 \| 3284

Subject:	Re: Variations on the "ADDER SUBTRACTOR" ("differtrans" ?)
Newsgroups:	lugnet.robotics
Date:	Thu, 28 Jan 1999 04:04:45 GMT
Viewed:	1175 times

I have mixed feelings about this device. I find it fascinating, for reasons I have yet to come to grips with. It has many weaknesses, the most significant being that only one motor provides propulsion, the other is only used for turning. When using tracks, if you don't gear the thing down ridiculously, there is not enough torque to drive the platform. It is lots of fun as a study in efficient re-configuration and optimization, but I don't find it terribly useful in practice unless wheels are employed. We have been trying to do this, but the problem that is eluding us now is a truly functional caster for the rear. -- SeeYa ! ------------ Jim ---------------------------------------------------------------------------- Hello... Is this thing on ? Mark Tarrabain wrote in message <36AFD272.E2ED9872@lynx.bc.ca>... > I like the name "differtrans", personally. :) But that's just my opinion. > > With so many variations on a theme coming about, I have to wonder if • anyone's > come up with the "best" implementation -- minimal volume and using no • unusual > pieces (such as the 1x1 technic brick with a hole). I challenged myself to • see > what I could do with it today. I got one that uses just the regular gears • and > beams, and is 2 LEGO units high, 6 units across, and the differentials are > side-by-side, their centers being only 4 studs apart. (Is that good?) > > You know, until I tried building it for myself, I didn't really understand • how > it worked. Now that I've actually assembled one, I have to say I think • it's a > real cool idea. Who originally came up with this device? (I mean in the • real > world, not necessarily just doing it with LEGO). > > > > Mark > >

Message has 1 Reply:

		Re: Variations on the "ADDER SUBTRACTOR" ("differtrans" ?)
(...) Which design did you use? If you try some of the more efficient designs it works quite well. On my webpage (just updated, (URL) I added pictures of my most recent robot. It runs the large wheels at a 1:3 ratio from the motors. The motors can (...) (26 years ago, 28-Jan-99, to lugnet.robotics)

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		Re: Variations on the "ADDER SUBTRACTOR" ("differtrans" ?)
I like the name "differtrans", personally. :) But that's just my opinion. With so many variations on a theme coming about, I have to wonder if anyone's come up with the "best" implementation -- minimal volume and using no unusual pieces (such as the (...) (26 years ago, 28-Jan-99, to lugnet.robotics)

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