I know my rotary is tiny by comparison with most of your machines but FWIW, I cut my own brass wormwheel using a tap running in the lathe. It took a couple of attempts before I got the right number of teeth for what I wanted but, for cnc, the exact ratio of the worm and wheel is probably not to important. I used a conventional screw tap but it would be perfectly feasible to use an acme tap or even make a cutter out of a scrap length of leadscrew. Because I am only dealing with light loads I just left the wormwheel with a concave thread but, if you arranged for the blank to pass across the tap, the teeth could be made flat. On the rotary I mounted the worm ( screwcut hardened and tempered tool steel ) in ball races with one end adjustable by a screwed collar to take up endshake. The wormwheel shaft is fitted in a eccentric bush so that the depth of engagement between the worm and wheel can be adjusted to remove backlash. --
Best wishes, Ian ________________ Ian W. Wright Sheffield, UK "The difference between theory and practice is much smaller in theory than in practice." ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://www.creativitycat.com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
