Subject:
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Re: Thoughts on Turning
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 26 Jan 1999 20:31:50 GMT
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Original-From:
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Medical Informatics Consulting <MEDINFO@AROS.stopspammersNET>
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Viewed:
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1047 times
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The problem is that the most common configuration used in Lego designs is
to have one motor turning one direction and the other turning in the
opposite direction (so, the motor controlling the right track is rotating
clockwise and the left track motor is rotating ccw). However, due to the
nature of electric motors, especially the Lego ones, and the gearing both
internal to the "motor" and exernally added by the builder / designer,
vehicles using this method often veer to one side to power/load imbalance.
By using an adder/subtractor, both tracks receive equal distribution of
power when the vehicle is travelling in a straight line.
Matt
On Tue, 26 Jan 1999, Reno Pittner wrote:
> Hi All,
>
> I'm fairly new to this list and take comfort in knowing I am not
> alone as the mechanically impaired. I have been involve in robotics
> for quite a few years, have a little electronic knowledge, and program
> for a living. Despite a ripe old age of 48, the MindStorm RIS has
> brought me into the Lego world. My wife just shakes her head. The
> poor woman is so confused. Well I guess beats having an affair and
> getting a sports car. Oh wait, I already have a sports car, I'll
> have to rethink that affair thing :)
>
> Back to Lego, like I said my mechanical skills are less than to be
> desired. I find some of the designs quite intriguing. I have some
> questions regarding various turning designs.
>
> 1) I'm not sure I understand the advantages of the fifth wheel
> design being discussed. I mean, why four wheels for forward
> motion. It seems a two center wheel with front and back coasters
> would accomplish the same thing on a smooth surface and is less
> complicated for turning.
>
> 2) The adder/subtractor differential. In a human controlled tracked
> based system, operation is controlled by switching the individual
> motors on and off. Motor speed is consistent to both through a petal.
> Actually this is a single motor with gearing for each track. In a
> a two motor system the adder/subtractor makes perfect sense.
>
> This method does not allow for smooth turning such as an arch. If
> the motors are controlled by speed, equal = straight, on motor
> greater than other = arch turn, one fwd one rev = turn in place
> I don't see the need for the differential as you are controlling the
> tracks. I don't think it will hurt but don't see the benefit. Please
> someone enlighten me. I just know this has to be a good thing.
>
> Thanks,
> Reno
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: Thoughts on Turning
|
| Hi All, I'm fairly new to this list and take comfort in knowing I am not alone as the mechanically impaired. I have been involve in robotics for quite a few years, have a little electronic knowledge, and program for a living. Despite a ripe old age (...) (26 years ago, 26-Jan-99, to lugnet.robotics)
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