by Cliff <Clhuprich@[EMAIL PROTECTED]
>
Aug 5, 2008 at 11:16 AM
On Mon, 4 Aug 2008 04:51:48 -0700 (PDT), alphawave <awtltd@[EMAIL PROTECTED]
>
wrote:
>On 4 Aug, 10:38, Cliff <Clhupr...@[EMAIL PROTECTED]
> wrote:
>> On Sun, 3 Aug 2008 08:35:28 -0600, "nitnit" <n...@[EMAIL PROTECTED]
> 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#Equations)
>> 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
Plastic is very forgiving.
--
Cliff
