On 28 October 2013 13:41, Stuart Stevenson <[email protected]> wrote: > Do you have a design you can share? I would try to model it.
The idea is stolen from: http://urobotics.urology.jhu.edu/projects/BW/ (I hate to think what a urology department intends to do with a ball worm) I was trying to model an enveloping version. Starting with a set of equally spaced points round a circle as the centre-lines of the balls. I ended up creating the waisted spiral as a set of points in Excel, joining them as a spline in Inventor, then using that as an extrude path to cut out the slots for on position of the worm. I then rotated that cut feature around the axis of the worm wheel. It soon became clear then the resulting tooth-spaces are not semicircular: https://picasaweb.google.com/lh/photo/z7gpHGfuYsP79pjRZ7xo4tMTjNZETYmyPJy0liipFm0?feat=directlink I think that the underlying problem is that the helix angle changes as the engagement radius changes. It may be that a suitably modified spiral can make it work. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
