Re: Bevel Gears?

On 4 Aug, 10:38, Cliff <Clhupr...@aol.com> wrote:
> On Sun, 3 Aug 2008 08:35:28 -0600, "nitnit" <n...@no.mail> wrote:
> >> I sort of doubt that as actual gears are mostly generated and (IIRC)
> >> the surface forms cannot be well-represented even by a NURBS surface.
>
> >Is the problem with representations the surfaces or their definitions?
>
> >Thought these were interesting enough to remember ...
>
> >http://groups.google.com/group/comp.cad.pro-engineer/browse_thread/th...
>
>   Hamei is an expert & very sharp.
>
> >http://groups.google.com/group/comp.cad.pro-engineer/browse_thread/th...
>
> >... and they represent 250%+ of my knowledge re the subject.  It's a
> >casual interest.  Its curious that none of the CAD comics or 'machine
> >design' How To articles on the subject ever mention any of it.
>
>   Many gears are cycloidal (seehttp://en.wikipedia.org/wiki/Cycloid#Equ
ations)
> and hence their surfaces (to be accurately defined/modeled) would require
> trig functions as their basis functions.
>   NURBS only allows for rational polynomials which do not well (IMHO)
> approximate such as trig functions.
>  http://en.wikipedia.org/wiki/Involute
> --
> Cliff

I did some work for a client recently who did a lot of gear stuff,
they invested in this:

http://www.camnetics.com/

I didn't get the oppertunity to play with it - but It looked very
impressive and from some of the finished parts (moulded gears) it
worked a treat.

Kev
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