Subject:
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Re: RCX 2.0 -- ideas.
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 15 Jan 1999 16:57:19 GMT
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Viewed:
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1404 times
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> > I am most interested in knowing how you used a RCX motor to shift
> > the motors into the two different drive trains. Does it require
> > any sensors?
> The problem of inaccurate motor control is a very real problem in this
> design. Since motors are controled by power/duration (not revolutions)
> getting repeatable movement is very hard. Because of this, cumulative
> error can result in the drive gears not being placed in the correct
> locations. To solve this problem the sliding arm was build such that
> when it is moved fully into the "A" position it's guide rod is free from
> the guide holes. This means that the motor can keep running past the
> end point and the gear simply slips. No damage is done, and a known
> starting point can always be guaranteed. If every drive train shift
Another way to do it might be ( - I have not built this, but been thinking
about it for a while, as I want to use it with a (manual, and possibly
later also motor-driven) car transmission of the common sliding-axle
type - ) to use rubber bands/springs to make the sliding parts
self-centering the way a toggle switch pulls into teh new position
once you've pushed beyond the threshold. TLG have done this recently
in the Spy Runner, the Cyberslam targets (in 8257, at least), and
in 8428/8432 (Turbo Command - rear suspension has 2 heights).
One would connect the motor and the actual sliding parts with a slightly
flexible arm, e.g. short piece of flex system tube, and have the
sliding parts go "from notch to notch".
A 2-position switch is trivial; I haven't tried one with more yet.
-gbr
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Message has 1 Reply:
 | | Re: RCX 2.0 -- ideas.
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| (...) The use of a spring loaded system using rubber bands or such would be a good idea for two position systems. But I can't think how to do it for transmissions like my current two that four positions. I think I'm going to try a motor with a worm (...) (26 years ago, 17-Jan-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: RCX 2.0 -- ideas.
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| (...) I replied to these questions from an e-mail Ian sent, but since it's here as a post also, I'll (partially) reply here too. I don't have any pictures, but I am working on a web site that will document all my custom input and output devices. I (...) (26 years ago, 15-Jan-99, to lugnet.robotics)
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