LEGO TECHNIC : 8004


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Subject:	A better device for tank treads than the adder / subtractor
Newsgroups:	lugnet.technic
Date:	Fri, 16 Aug 2002 03:49:48 GMT
Viewed:	1029 times

I have a challange for those realy good at using differentials and gears: The adder / subtractor device is not the ideal device for use in tank treads. An ideal device would drive straight forward and back with both motors running. It would also be able to turn in place with some combination of motors running, (maybe one motor or both motors turning in opposite directions). It would be good if it allowed partial skid steering, (both treads turning buy one turning faster than the other). The above condition may be accomplished by motors directly driving the treads but with a mechical link to ensure equal turing when both motors are powered. The mechanical link would be broken if only one motor were powered, or if the motors where powered to drive the treads in opposite dirrections. Anyone have any ideas? Roy Nelson

Message has 3 Replies:

		Re: A better device for tank treads than the adder / subtractor
(...) Well, an adder/subtractor (a/s) does turn both treads evenly, but only with one motor driving. (...) An a/s does this when the drive motor is stopped and the other motor turns. (...) Controlled by the speed / direction of "turning" motor. (...) (22 years ago, 16-Aug-02, to lugnet.technic)

		Re: A better device for tank treads than the adder / subtractor
(...) I think most of your problems would be solved by installing a clutch that links the left and right drive axles. It would be somewhat like the limited slip differential in the Ferrari brothers book. I perfer using the clutch gear instead of (...) (22 years ago, 16-Aug-02, to lugnet.technic)

		Re: A better device for tank treads than the adder / subtractor
(...) Do you want both motors to contribute to the power when driving straight? I.e., is your worry that one motor is idle, and hence does not contribute to the motion? Is that why you want a different arrangement? As I see it, the main advantage (...) (22 years ago, 16-Aug-02, to lugnet.technic)

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