Subject:
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Re: multiple motors
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 25 Nov 2003 13:45:21 GMT
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Viewed:
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3841 times
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In lugnet.robotics.rcx, Brian Davis wrote:
> and the remaining two motors (one left & one right) from OUT_B.
> All's well and good when running forward or backward, but to turn I'm in
> trouble: the last two motors will try to fight each other. Obviously I don't
> power OUT_B during a turn, but if OUT_B is set to Float those last two
> B) Is there a better way to do this? Run six motors in two triplets from
Well, I've never actually tried running six motors directly from the RCX.
However, I have used three motors to drive a sumo robot.
And I've also used four motors (two on each side) to drive six wheels (two on
the right, two on the left, and two in the middle)
The key is to use a differential.
With six motors (double what I did with three), put two motors on each side
(2xRight + 2xLeft), and the other two are connected to a differential, in the
middle (like the drive wheels in a car). They will suppily power to both sides.
When the robot is going forward/reverse you can drive all motors. When the
robot is turning, you can float or brake the middle motors, like you've been
doing.
The only hard part is making sure all your gear ratios are the same.
> > And my BIGGEST piece of advice for your sumo robot: make SURE it
> > does not leave the sumo area on it's own.
>
> I'll second that. Boy, will I ever...
I don't think it hurts to re-state this. :)
Steve
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Message has 2 Replies:
 | | Re: multiple motors
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| (...) I'm just thinking out loud here, but it seems that the problem with the two middle motors is that they are wired together. So even if the RCX is told to float the motor output, both motors will want to turn together. If one turns, it will act (...) (21 years ago, 25-Nov-03, to lugnet.robotics.rcx)
| | | Re: multiple motors
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| In lugnet.robotics.rcx, Steve Hassenplug wrote: <SNIP> (...) </SNIP> So Steve (or Brian or anyone else reading this), have you actually built the drive train you describe? And if so, can you share the specifics of the gearing and configuration of (...) (21 years ago, 15-Feb-04, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: multiple motors
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| (...) ...I love understatment. sigh... (...) OK, in trying to implement this I've come to an interesting impasse. Calculations suggest that for a 4 lb sumobot with reasonable tires would "benefit" from six motors, three on each side (differential (...) (21 years ago, 25-Nov-03, to lugnet.robotics.rcx)
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