Subject:
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Re: Newbie needs Help (diff sensor)
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 7 Jun 2006 11:27:59 GMT
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Viewed:
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3905 times
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In lugnet.robotics, Mr S <szinn_the1@yahoo.com> wrote:
> Philo,
> That's interesting, and looks to explain why it is that I've
> never been able to observe the RCX output going to thermal
> or current protection cutoff?
It does happen - if you use more that 2 motors or if you try to use a RC motor.
The driver circuit limits current around 500mA, and at that rate it is not long
before going in thermal shutdown mode.
> I did push them to stall conditions with two motors on each. I
> half expected to see smoke,
No, you won't see smoke... RCX motor drivers are very well protected. I never
saw one that failed!
> On a side note, your work on testing the motorcycle tires for
> traction is of interest to me, and I never got around to asking,
> but on a side note here, when you tested this tire
> <http://philohome.com/traction/2903.jpg> do you think that the
> performace would be improved if the tire were filled with a kind
> of PFE tubing (so as to make it a run flat kind of tire) so that it
> did not suffer from excessive compression of the rubber tire?
Honestly I don't know... some more testing would be in order! But it's fairly
hard to control external parameters for that test. As indicated by Steve
somewhere else in that thread, it would be interesting to perform static (no
slip) tests too, but that's even more difficult due to the transient nature just
at the limit...
Philo
>
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Message has 1 Reply:
 | | Re: Newbie needs Help (diff sensor)
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| (...) A rather inventive young man that I know did try exactly that - using the ribbed tubing from the Mindstorms set inside the Mindstorms motorcycle tire. It's a good fit, and a good idea, but I'm not sure how effective it was. (...) One simple (...) (18 years ago, 7-Jun-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: Newbie needs Help (diff sensor)
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| Philo, That's interesting, and looks to explain why it is that I've never been able to observe the RCX output going to thermal or current protection cutoff? I've one largish sumo type bulldozer style robot with 4 treads that can easily push 4-5 (...) (18 years ago, 7-Jun-06, to lugnet.robotics)
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