Subject:
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Re: need help with modeling 8860 steering
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Newsgroups:
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lugnet.cad
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Date:
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Fri, 15 Dec 2000 15:56:12 GMT
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Viewed:
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833 times
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"Bram Lambrecht" <bram@cwru.edu> wrote in message
news:MABBIBJJFOJIOHDFDCEBCEGDCJAA.bram@cwru.edu...
> Coby Bassett writes:
> > I am trying to model the 8860 Auto Chassis Expert Builder set (in
> > POV-Ray) and am baffled by how to get its steering system right. Check • out
> > the front of the car in these pictures from the building
> > instructions to see the section I'm referring to:
> > http://brickshelf.com/scans/8000/8860/8860-14.html
> > http://brickshelf.com/scans/8000/8860/8860-15.html
> > http://brickshelf.com/scans/8000/8860/8860-16.html
>
> Does this little illustration help any?
> http://brickshelf.com/cgi-bin/gallery.cgi?i=23723
> (B is the rack turntable)
> If you know the displacement of the steering rack, it shouldn't be too
> difficult to calculate length c. However, I haven't thought a whole lot
> about how the interior angles of the triangle relate to the rotation of • the
> component parts. I'll leave that as an exercise for the reader :P
Nicely done! Just last week I had to look up the Law of Cosines to
position some technic beams.
The "exercise" is a simple matter of considering the right triangle ABD
(where AB is the hypotenuse--either of the two possible right triangles
will work). If you use the triangle ABD where D is to the upper left
corner in Bram's diagram, then angle A of this triangle will be
acos(sideAD/sideAB). Then just add that to the Angle A you found using
the Law of Cosines.
If only I had grasped 15 years ago the value of trigonometry for
positioning virtual Lego--I'm sure my grades would have been better :-)
-John Van
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Message is in Reply To:
 | | RE: need help with modeling 8860 steering
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| (...) (URL) is the rack turntable) If you know the displacement of the steering rack, it shouldn't be too difficult to calculate length c. However, I haven't thought a whole lot about how the interior angles of the triangle relate to the rotation of (...) (24 years ago, 14-Dec-00, to lugnet.cad)
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