"and feed the hob once every revolution of the work. " That is geared as well it is a continuous function
"For adjusting the twist, I was figuring on accurately placing two drill bushings that would hold two dowel pins against which I would place my sine bar, and just use a set of gage blocks to get the angle right." a rotary axis, but this does not have to be as accurate as one first thinks, on my hobbing machine and the one I used to use it is just lines marked on the head and vernier lines on the body to clamp up the angle. On the Mikron you could only estimate to about half a degree iirc. On the Barber Colman, see the ball handle upper middle to the rear of the head http://www.collection.archivist.info/archive/DJCPD/PD/2014/2014_09_17_Barber_Colman_cnc/IMG_1830.JPG That has a vernier marked to allow estimation to 5 minutes. Dave Caroline ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
