Clever. Doesn't really need to be 1:1. If the spindle makes 2, or 3, or 4 revs per each rev of the encoder it would still work just fine even for threading. A non-integer would be a problem though.
On Mon, Dec 7, 2015, at 10:46 AM, andy pugh wrote: > I have a lathe with a moderately large spindle. I want to drive an > encoder (well, actually, a resolver) at a 1:1 ratio from this. > > The obvious way is with a 1:1 gear set, or a belt, but that does > involve really quite a large gear on the weeny resolver shaft. > > I have been thinking about a 200:1 worm drive for an auxilairy > resolver for absolute Z-axis positon feedback (I want to eliminate Z > homing moves) and it occurred to me to wonder if a 1:1 ratio worm > drive is possible, with the wheel much smaller than the worm. > > So, I modelled a 10-start worm and a 10-tooth wheel in CAD, and it > wasn't long before I realised that I was designing something that I > have seen before. A speedometer drive. > > http://www.ebay.co.uk/itm/251440255353 > > Now to find one with the right ratio and bore size. > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > Go from Idea to Many App Stores Faster with Intel(R) XDK > Give your users amazing mobile app experiences with Intel(R) XDK. > Use one codebase in this all-in-one HTML5 development environment. > Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. > http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users -- John Kasunich [email protected] ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
