Subject:
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Re: Vehicle with square wheels
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 8 Dec 2005 14:40:53 GMT
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Viewed:
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2251 times
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Hi,
I am not sure about the crown gears - looking at them, the crowns
teeth overhand a central bush which attaches to the axle. Putting them
head to head would not work as this central axle honnetion would
prevent the teeth from meshing. However - you might be able to acheive
the same result by having a toothed half-bush as mentioned below. My
only concern is that those may not take a lot of torque. I just get
horrible visions of teeth being stripped off the half-bushes. Maybe
this could be acheieved with a housing, with four sets of two pinions
at 90 degrees - meaning you still get the original direction. The only
problem there is you are still contending with the gear slack/take up
and will not get a completely smooth transference.
--
Danny Staple MBCS
OrionRobots
http://orionrobots.co.uk
(Full contact details available through website)
On 07/12/05, steve <lego-robotics@crynwr.com> wrote:
> Jordan Bradford wrote:
> > I saw this linked on Slashdot:
> >
> > <http://www.prweb.com/releases/2005/12/prweb316686.htm>
>
> I liked it too.
>
> > I think I'll try building one of these, if I can get the offset angle to
> > work.
> > It's 1/4 of 90 degrees, according to the article.
>
> My first thought was also of a Lego solution. I also got stuck at the
> point where I'd have to have plates at 22.5 degree offsets - however,
> I think I have an elegant solution that I came up with on the drive
> home this evening:
>
> I think it's possible by taking two axles with a crown gear on the end
> of each. Then you can mesh the two gears at any angle you choose to
> make (in effect) a long axle with the two '+' cross-sections of the ends
> aligned at almost any angle.
>
> You have to finagle some kind of U-shaped clamp to hold the gears
> together - but that's easy.
>
> > The way this vehicle is set up, it only moves in a straight line.
> > How might one steer it? Shifting the center of gravity? Disconnecting
> > one of the wheels from the others temporarily?
>
> The developer claims he has some ideas for steering...no mention of what
> they are though.
>
> You can't disconnect a wheel because you'd lose the 22.5 degree offset
> to the other wheels and the whole vehicle would come to a permenant
> halt.
>
> Maybe you could accellerate the rotating weight as it passes down
> one side of the vehicle and slow it down as it goes down the other
> side.
>
> Perhaps you just use a huge gyroscopic flywheel to steer with.
>
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Message has 2 Replies:
Message is in Reply To:
 | | Re: Vehicle with square wheels
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| (...) I liked it too. (...) My first thought was also of a Lego solution. I also got stuck at the point where I'd have to have plates at 22.5 degree offsets - however, I think I have an elegant solution that I came up with on the drive home this (...) (19 years ago, 7-Dec-05, to lugnet.robotics)
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