LEGO TECHNIC : 15541


Technic / 15541	15540 \| 15542

Subject:	R/C skid steer test
Newsgroups:	lugnet.org.ca.rtltoronto, lugnet.technic
Date:	Thu, 1 Feb 2007 21:02:14 GMT
Viewed:	2397 times

Well- I finally got around to testing the idea of a R/C tank. I built a little test rig just to see how it would work. The idea is an adder/subtractor drive, with the R/C "drive" output goes to a motor on the base input and the steering output tied to a polarity switch. The polarity switch is connected back to a battery box, and the output is connected to a motor on the added/subtracted input. I used the R/C motors for both driving and steering, so it whips around pretty fast. It isn't pretty, but it gives me enough confidence to make a tracked base with the same drive, now. http://www.brickshelf.com/gallery/ffaat/RC-Tank-Test/img_1882.jpg A front view showing the polarity switch: http://www.brickshelf.com/gallery/ffaat/RC-Tank-Test/img_1883.jpg And a shot of the differential adder/subtractor drive, straight from Doug's page here (http://www.visi.com/~dc/adder/index.htm): http://www.brickshelf.com/gallery/ffaat/RC-Tank-Test/img_1884.jpg Also, I put up a video of it in action: http://www.youtube.com/watch?v=9PmweX1gc60 -Rob A>

Message has 2 Replies:

		Re: R/C skid steer test
(...) Nice idea. I made a similar prototype some time ago, which does not need a battery pack, but which can not have both tracks running in opposite direction. Some images here: (URL) Julien (18 years ago, 2-Feb-07, to lugnet.org.ca.rtltoronto, lugnet.technic)

		Re: R/C skid steer test
(...) Nice! Can it steer while also moving forward, or does the switch work with just a 3-position action (turn right/go straight/turn left)? Could you also use 3 12-tooth gears for the side opposite the 2 24-tooth gears, or did you use the 2 (...) (18 years ago, 6-Feb-07, to lugnet.org.ca.rtltoronto, lugnet.technic)

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