Subject:
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Re: Any Ideas= 8448 and 4 wheel steering?
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 11 Jan 2001 02:50:25 GMT
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Viewed:
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768 times
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Thank You Steve! it actualy makes sence,I am going to go try this.
Gary
Steve Bliss <steve.bliss@home.com> wrote in message
news:0tap5t49a8ukgha4hnkb21117g9rj9j4h4@4ax.com...
> In lugnet.technic, blessing wrote:
>
> > I've been thinking about this for about a week and can't come up with
> > anything.
> > I even looked at the 8880 instructions but I couldn't figure out how to • make
> > the conversion. Does anyone have any ideas?
>
> Hmm. I'm not a Technic-head, and I haven't actually sat down and played
> with the ABS to know how well this would work, but here goes an idea...
>
> In order to look right (and work well, I think), the pivot for the rear
> wheels need to be as close to the wheels as possible. So the steering
> needs to be mounted on the suspension, not the other way around.[1]
>
> The powerdrive on the 8448 has an outer universal joint on each rear • wheel,
> to facilitate the suspension. Would it be possible to leverage[2] these
> u-joints to allow rear-wheel steering?
>
> Imagine an L-shaped steering arm that rotates horizontally. The point of
> rotation is the center of the L. The steering arm is located so the point
> of rotation is located directly beneath the existing u-joint, and the axis
> of rotation is vertical.
>
> One leg of the steering arm is in line with the outer axle, to which is it
> attached (in a manner that allows the axle to rotate, of course).
>
> The steering arm's other leg has a towball pin on the end, so that it can
> be attached to the typical steering link (which is attached to the typical
> gear rack, etc.).
>
> The main problem[3] with this idea is that the distance from the wheel to
> the center of the u-joint will cause the wheel to move noticeably when it
> is turned (it will swing around, instead of rotating on it's centerpoint).
> It seems like the only way to avoid this problem would be to put a collar
> over the one half of the u-joint itself. Too bad I don't know of any LEGO
> parts that can accomplish that feat...
>
> Oh, heck. Here's a quick'n'dirty image that hopefully will illustrate • what
> I'm trying to explain.
>
> <http://www.brickshelf.com/cgi-bin/gallery.cgi?i=26839>
>
> The yellow and black is the L-shaped steering arm. The clear white is the
> u-joint and axle. The clear black is the steering link. The steering arm
> would rotate around the green axis. The wheel & tire would mount on the
> end of the clear white axle.
>
> And yes, I realize the yellow bits don't line up.
>
> --
> Steve
> 1) That's probably an obvious point for many people, but I don't redesign
> suspension & steering very often -- I just drive my motorized 8448 around
> the floor.
>
> 2) You decide if the pun is intended or not.
>
> 3) I'm sure there are other problems, I just haven't thought too much • about
> them.
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Message is in Reply To:
 | | Re: Any Ideas= 8448 and 4 wheel steering?
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| (...) Hmm. I'm not a Technic-head, and I haven't actually sat down and played with the ABS to know how well this would work, but here goes an idea... In order to look right (and work well, I think), the pivot for the rear wheels need to be as close (...) (24 years ago, 10-Jan-01, to lugnet.technic)
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