Subject:
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Re: About velocity.
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 25 Mar 2007 08:40:39 GMT
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Original-From:
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steve <sjbaker1@airmailAVOIDSPAM.net>
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Viewed:
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4131 times
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M.H wrote:
> First, I'm a beginner.
> So it will be very easy question for you guys.
>
> I have to make a lego robot with RCX model as fast as it possible.
> I just can use two motors and 4 wheels.
> It means I can use only a 'driving base'.
>
> I made gear ratio for 1:1, and programed the highest moter power.
> But I think I need some more...
You can push the gearing still higher - 1:1 isn't the upper limit.
But the trick with gearing is to match the gearing to the torque
that the motor provides - and to use as few stages of gearing
as possible. If 1:1 gearing is optimal - then just put the
wheels directly onto the motors and don't use any gears at all.
Secondly - remember that the diameter of your wheels is (essentially)
another stage of gearing. Switching to smaller wheels is like dropping
down to a lower gear...using bigger wheels is the opposite.
If you are driving over a short distance from a standing start
then accelleration may be more important than top speed - and
using a lower gear might actually get you over the line faster.
In the case of short distance 'sprints', you'll also need to
consider whether your wheels have enough grip. The robot Sumo
guys have done a ton of research on that subject.
If all you want to do is to go fast, then dump the RCX and use
one or even two Lego battery boxes instead - they are a lot
lighter than the RCX. Consider whether a three wheeled design
would be lighter.
Put the weight on top of the driven wheels as far as possible,
that'll get you better traction during accelleration.
Finally, when you build your robot, don't clamp the axles too
tightly to the axle holes in your chassis - make sure they spin
freely.
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Message is in Reply To:
 | | About velocity.
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| First, I'm a beginner. So it will be very easy question for you guys. I have to make a lego robot with RCX model as fast as it possible. I just can use two motors and 4 wheels. It means I can use only a 'driving base'. I made gear ratio for 1:1, and (...) (18 years ago, 25-Mar-07, to lugnet.robotics)
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