Subject:
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RE: Newbie needs Help
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 5 Jun 2006 18:48:03 GMT
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Original-From:
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Tac Tacelosky/Smokefree DC <tac@cheztac.comNOSPAM>
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Viewed:
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2238 times
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"BTW, don't use tank treads."
How come? Gut feeling is that it would provide more traction?
-----Original Message-----
From: news-gateway@lugnet.com [mailto:news-gateway@lugnet.com] On Behalf
Of Steve Hassenplug
Sent: Monday, June 05, 2006 2:36 PM
To: lego-robotics@crynwr.com
Subject: Re: Newbie needs Help
On Mon, June 5, 2006 12:47 pm, raj wrote:
> > One major key to making a good Tug-of-War robot will be making it go
> > the "right"speed.
>
> - the wheels do keep spinning when the robot is held in place
> - weight limit is imposed indirectly by being limited to one set of
> 9794
>
> Problems/questions:
> - even after 'loading' the robot with the entire set (IR tower too!), • there
> is insufficient weight for the torque available. No way around this • is
> there?
> - roughly at what gearing ratio are you at risk of breaking gears and • axles?
> FLL literature mentions 125:1 as probably too much. What would be • 'extreme'
> and still safe?
I suspect you're far from breaking gears or axles. However, keep in
mind it is always possible (so don't blame me if it happens) :) Keep
the distance between gears & wheels small, so the axles don't twist.
Sounds like you still have more torque that you are using. (the wheels
are
spinning) So, you don't need to gear it down anymore. That will just
give you MORE torque.
You can (A) add more weight (B) make it go faster, or (C) add more
traction.
Considering you're already at the weight limit (out of parts), option
(A) is out.
Making it go faster is a reasonable option. Geared down 5:1 should
still work, depending on the wheels.
Adding more traction would mean using more wheels. It's likely you're
out of wheels, because there are only 3 wheels in a couple types in the
RIS kit. So, you're best option would be to increase the speed.
Also, it sounds like you can really start doing some testing. Use some
string or something, and have the robot drag books across the table.
See how changing things will make a difference in the weight of the
books it can move.
Finally, remember, you can mechanically connect all the motors together,
so they are driving the same wheels. This assures all wheels are
getting the maximum amount of power.
BTW, don't use tank treads.
Steve
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Message has 1 Reply:
 | | RE: Newbie needs Help
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| (...) Yes, you would think so. But, they don't. Tank Treads look like they have a big "contact-patch" with the ground. In reality, each one only applies pressure in two points (at each wheel), and even those are not in contact with the ground all (...) (18 years ago, 5-Jun-06, to lugnet.robotics)
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