Could get the same effect as cutting teeth with a multi tooth straight hob. As the gear is turned, the involute curves are formed as a series of facets. With a 4th axis under CNC control you can have as many facets as you want. After milling I'd want to run gears together for a bit with some lapping compound to smooth the facet edges.
https://www.youtube.com/watch?v=K785jfrsKQU For two small double gears in the gearbox output drive for a LeBlond 13" light duty "trainer" lathe from the 1940's, using a very small end mill and CNC, or a shaper, are the only ways to do the smaller gear on each one. The larger gears could be cut with a conventional spiral hob but the small one is too close to hob. The small gear could be hobbed if one would want to redesign the double gears to be assembled from at least two pieces. On Thursday, July 23, 2020, 4:24:26 AM MDT, andy pugh <[email protected]> wrote: On Thu, 23 Jul 2020 at 03:41, andrew beck <[email protected]> wrote: > https://youtu.be/3u1bZxd-KCk With a 4th axis (which I realise you don't have) you would be able to generate a tooth form using the flank of the cutter in just the same way as you can with a shaper. (Ideally you would use a conical tool bit ground to the required pressure angle) _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
