For a helical gear the blank rotates and its no longer a simple 40:1 for a 40 tooth helical gear, a mechanical hobbing machine has a differencial gear to add or subtract the rotation with cut. see diagram at top of page http://www.collection.archivist.info/hobbing.html
I have done the maths in gcode to make a helical, it was milled but the principle is the same http://www.youtube.com/user/davethearchivist?feature=mhw4#p/a/u/1/HAtziCsUj5Q I tilt the B axis(tooth helix angle) and rotate the A axis(pitch of helix) Dave Caroline ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
