Subject:
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Re: Liebherr LG 1750
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 21 Aug 2005 01:32:37 GMT
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Viewed:
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3971 times
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In lugnet.technic, Steve Lane wrote:
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In lugnet.technic, Eric Sophie wrote:
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Hey nice chasis, I like the underside shot where you can see all the steered
wheels.
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For a while now I’ve been wanting to build a vehicle with multiple evenly
spaced steered axles. The difference this time being that instead of using
gearing to generate the different steering angles required I’d like to use
fixed links instead. My problem is that despite looking on the internet I
can’t find the right equations to work out the lengths of the links.
I can work out how much each axle should steer to accurately track around a
single point of rotation, but it’s the second part of the maths that elude me.
Does any one know how to do this?
I reckon I’ll probably have to use Lego screw threads to get the precise link
length I need, but that shouldn’t be too much of a problem.
The chassis will form the first (fixed) link. Each of the two axles I’m
connecting will have it’s own steering arm at a ninety degree offset, and then
the final link will connect them.
As each successive axle will turn less, the system will effectively be geared
down as it goes along, requiring less additional energy each time an axle is
added.
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Well I didnt bother working out the exact lengths, but I found
this technique works ok.
I’ve since refined it to allow normal steering and crab steering, and anything
in between, but have yet to actually complete a MOC using it.
ROSCO
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Message has 2 Replies:
 | | Re: Liebherr LG 1750
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| (...) That wouldn't work with my design as there is very little room in the middle. I'd intended to link the opposing wheels with just a normal bar. The linkages between axles are going to run down just the left (or right) side. Steve (19 years ago, 21-Aug-05, to lugnet.technic, FTX)
| | | Re: Liebherr LG 1750
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| Is it a lot easier to turn than using gears? Also, is it possible to hook this system up to a steering wheel? (19 years ago, 21-Aug-05, to lugnet.technic, FTX)
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Message is in Reply To:
| | Re: Liebherr LG 1750
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| (...) For a while now I've been wanting to build a vehicle with multiple evenly spaced steered axles. The difference this time being that instead of using gearing to generate the different steering angles required I'd like to use fixed links (...) (19 years ago, 20-Aug-05, to lugnet.technic)
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