Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Cone primitives
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 14 May 1999 02:52:20 GMT
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Viewed:
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771 times
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Karim <knassar@mindspring.com> wrote in message news:FBp65M.C8D@lugnet.com...
> In lugnet.cad.dev, John VanZwieten writes:
>
> > See above for naming of cones. I'm pretty sure the current primitives are
> > sufficient to suit your needs. Check out Steve Bliss' cone spreadsheet
> > mentioned in this thread. If you still can't figure it out from that, post • the
> > inner and outer radii and depth for the cones you need, and I'll work on it
> > when I get a chance.
>
>
> Ok, I'm just about done with this part... but the hangup is the final section
> of conical canopy at the nose. This cone goes from a radius of 20 to a • radius
> of 1.943 in a Y-scale of 12.243.
>
> I've tried Steve's spreadsheet, and it really doesn't seem to handle such a
> severe reduction well. By the numbers it gave me it looks like I would have • to
> build that little piece of surface out of more than 10 cone pieces (for each
> outer and inner surfaces).
>
> Since the actual tip is going to end up faceted anyway (as per Steve's • advice:
> see other thread), I wonder if it's just not worth the trouble to try to use
> primitives on this bit of the part.
>
> I could make a cone primitive to fit this, but I was trying to figure out how
> to fit it into the convention for previous cone primitives... it looks like • it
> would be something like "Cone0.058" :-) not quite a reasonable primitive, • huh?
>
> anyway, as always, advice is appreciated.
Using your 1-4con1.dat, here's the cone you requested:
1 16 0 1.317 0 1.943 0 0 0 1.317 0 0 0 1.943 1-4con1.DAT
1 16 0 3.836 0 3.8 0 0 0 2.577 0 0 0 3.8 1-4con1.DAT
1 16 0 8.175 0 7 0 0 0 4.746 0 0 0 7 1-4con1.DAT
1 16 0 12.243 0 10 0 0 0 6.78 0 0 0 10 1-4con1.DAT
1 16 0 1.317 0 -1.943 0 0 0 1.317 0 0 0 1.943 1-4con1.DAT
1 16 0 3.836 0 -3.8 0 0 0 2.577 0 0 0 3.8 1-4con1.DAT
1 16 0 8.175 0 -7 0 0 0 4.746 0 0 0 7 1-4con1.DAT
1 16 0 12.243 0 -10 0 0 0 6.78 0 0 0 10 1-4con1.DAT
But I'm not sure that's exactly the cone you need. As I see it, the cone you
need should cover the area between the edge lines:
2 24 -20 -8 -30 -4.243 -8 -44.243
and
2 24 20 -8 -30 4.243 -8 -44.243
So I think you need a cone from radius 20 to radius 4.243 over a y of 14.243.
Plug the above cone into your part and see if you agree. If so I'll work up
this above cone tommorrow. It's 10PM here and finally time for me to leave the
office.
-John Van
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Message is in Reply To:
 | | Re: Cone primitives
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| (...) the (...) Ok, I'm just about done with this part... but the hangup is the final section of conical canopy at the nose. This cone goes from a radius of 20 to a radius of 1.943 in a Y-scale of 12.243. I've tried Steve's spreadsheet, and it (...) (25 years ago, 14-May-99, to lugnet.cad.dev)
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