Subject:
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Re: Discussion-Large Technic Shock 2909c01.dat
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 10 May 1999 08:30:00 GMT
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Viewed:
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634 times
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-----Original message-----
From: Terry K <legoverse@geocities.com>
To: lugnet.cad.dev@lugnet.com <lugnet.cad.dev@lugnet.com>
Date: maandag 10 mei 1999 4:05
Subject: Re: Discussion-Large Technic Shock 2909c01.dat
Karim wrote:
> > I have a fourth idea. It's a bit difficult to explain, but I'll try to
> > make it clear:
> >
> > There would be a total of 3 pieces to make up the shock:
> >
> > A) Shock lower w/ half of spring
> > B) Shock upper
> > C) Spring upper half
> >
> > Since the spiral is fairly constant (except for the two extreme ends)
> > over the length of the spring, one could make a spring at any length by
> > moving the spring halves closer together and then rotating the upper
> > half until the spiral ends are coincident.
> >
> > So, the process for building a Shock of 'x' length is:
> >
> > 1) Place Part "A" at desired location.
> > 2) Place Part "B" at desired location and 'x' distance from part "A".
> > 3) Place Part "C" at correct position relative to Part "B".
> > [at this point, the spring will look funny because the two halves will
> > overlap and be mis-aligned in the middle of the run of the spring.]
> > 4) Rotate Part "C" until spiral is coincident with Spring segment of
> > Part "A".
> >
> > Ideally, the origin for part "C" should match that of part "B", to make
> > insertion easier.
> >
> > --Karim
Terry answered:
> Leave it to Karim to be clever. :-)
>
> A very interesting idea. I am somewhat chagrined to have not thought of it
> myself. The only difficulty is the precise rotation needed.
> But I expect that the simplest way of using this assembly will be by making
> a shock subfile for your model. Doing it that way would simplify the
> rotational difficulties. Much easier than trying to place the pieces, at
> angles, in a model an then trying to adjust the length and rotate the
> spring section.
>
> I would like to ask Onyx (you reading this, Jeff?) if he could whip up a
> quick sample based on this idea and we could try some tests.
The idea of using a shock subfile first where the desired shock length is
obtained and then use the subfile for easy placement en rotation, also works
well for the 4th idea Terry mentioned. Terry wrote:
> Some people may raise the question of just having one spring length, and
> then stretching or compressing it by altering the scale of the piece along
> one axis in the dat file.
He rejected it claiming that scaling would be difficult. However, in the
shock subfile the scaling can be done along just one axis, by changing one
number in the line, and that is not difficult at all.
Scaling factor = desired length / original length.
In my opinion scaling the spring this way is easier than the positioning and
rotating method suggested by Karim.
Terry also claimed that scaling the spring part distorts the spring
structure. I think this can be avoided if the scale-able part of the spring
is limited to the section with equal space between the windings. The upper
and lower ends of the spring containing the structure that must remain
undistorted, can be added to the upper and lower pieces of the shock
absorber.
Greetings, M. Moolhuysen.
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Message has 1 Reply:
 | | Re: Discussion-Large Technic Shock 2909c01.dat
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| (...) Another negative thing I see with this method is that the dat file _must_ be manually edited to affect the scaling change. It can't be done from LEdit. This is what makes it difficult - at least for the casual user. Karim's method can be done (...) (25 years ago, 10-May-99, to lugnet.cad.dev)
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