Subject:
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Re: Some help or advice requested
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 25 Jan 2010 21:58:31 GMT
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Viewed:
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20956 times
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In lugnet.technic, Jean-Marc Nimal wrote:
> > I have been asked for some pictures of what I am working on (very much
> > prototypes at the present - don't expect anything elegant). ...
> > Hope that helps to clear things up - keep the ideas flowing!
> >
> > Owen.
>
> Well, seeing your pictures, I can't help wondering: do you actually need the
> tray to change direction as soon as it hits the end?
>
> If not, you can use a much easier solution: just power its motor for a given
> amount of time in one direction, then the same amount of time in the other
> direction, and so on. If your tray needs, say 14 seconds to move to one side,
> just apply power for 16 or something.
>
> The only drawbacks are that you need to be sure that it's not a problem to
> continue to apply power when the tray is at the end (which you can do using a
> clutch wheel although seeing your pics I don't even think you need anything);
> and that the timing doesn't need to be too exact.
You're quite right in that there's nothing in the pictures to suggest that
having the having the motor running after the tray reaches its stop would be a
bad idea. However, that would be disastrous for the rest of the machine - think
of a typewriter where the keys continued to type after the carriage reached the
limit of travel. The machine would still function, but the result is not what
was intended.
In any case, I would like to avoid using an RCX if it is at all possible.
Thanks for your suggestion though.
Owen.
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Message is in Reply To:
 | | Re: Some help or advice requested
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| (...) ... (...) Well, seeing your pictures, I can't help wondering: do you actually need the tray to change direction as soon as it hits the end? If not, you can use a much easier solution: just power its motor for a given amount of time in one (...) (15 years ago, 25-Jan-10, to lugnet.technic)
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