Robotics : 19066


Robotics / 19066	19065 \| 19067

Subject:	Re: Some questions that relate to an idea I am thinking about
Newsgroups:	lugnet.robotics
Date:	Thu, 19 Sep 2002 15:33:42 GMT
Original-From:	Chris 'Xenon' Hanson <XENON@3DNATUREnospam.COM>
Reply-To:	xenon@^Spamless^3dnature.com
Viewed:	750 times

Mike Thorn wrote: > I think what you want is a 4-wheel-steering car; or better yet, a > tricycle - one motor for drive, one motor for steer. If you don't want > to paint your ceiling, stand the RCX up with the IR port to the sky and > you're set. > > 4WS wouldn't be as easy and it wouldn't have as great a turning radius, > but it's a more interesting design, IMHO. I've always wondered about the possibility of a non-steerable drive system powered by one motor output, with a large 'foot' that could descend from the center of the bot to lift the wheels/treads off the ground (pneumatics?) and a third output controlling a motor that would rotate the foot clockwise or counterclockwise (thus counterrotating the bot counterclockwise or clockwise relative to the ground), and driving a rotation sensor to moderately precise measured turns could be executed. Challenges: Strength of lifting apparatus Strength and stability of 'foot' Weight/balance of bot (so it is stable while it is raised and turning) Has anyone done anything like this? It would seem to allow you to build a very strong rigid drive system that could still execute precise tight turns. It could not turn 'on the move' unfortunately, but it would be a good system for a move-scan-plan-move robot that could get itself out of tight corners. Chris - Xenon -- Chris Hanson | Xenon@3DNature.com | I've got friends in low latitudes! New World Construction Set 6!: http://www.3DNature.com/ "There is no Truth. There is only Perception. To Perceive is to Exist." - Xen

Message has 2 Replies:

		Re: Some questions that relate to an idea I am thinking about
(...) I thought of trying this in order to get precise 90 degree turns WITHOUT using a sensor of any kind. The idea would be to have mechanical endstops preventing the 'foot' from rotating more than 90 degrees in either direction with some kind of (...) (22 years ago, 20-Sep-02, to lugnet.robotics)

		Re: Some questions that relate to an idea I am thinking about
(...) I have built a robot based on this architecture. I used it to attend a contest where the robots had to cover a distance, touch a wall, rotate and come back as precisely as possible to the starting point. I don't have a page on my site for this (...) (22 years ago, 20-Sep-02, to lugnet.robotics)

Message is in Reply To:

		Re: Some questions that relate to an idea I am thinking about
I think what you want is a 4-wheel-steering car; or better yet, a tricycle - one motor for drive, one motor for steer. If you don't want to paint your ceiling, stand the RCX up with the IR port to the sky and you're set. 4WS wouldn't be as easy and (...) (22 years ago, 19-Sep-02, to lugnet.robotics)

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