The video shows a hobbing machine based on an article that appeared in the "The Model Engineers Workshop" magazine in 2003.In this article a 20 to 1 dividing head was controlled by an encoder driven from the hob arbor .The summary at the end suggested that the system was unlikely to work with a 40 to 1 dividing head .As you would be aware I used this system to cut the gears for the model using a 90 to 1 rotary table.This system was used to cut 2,25 module final drive gears in 4140 steel for the final wheel reduction gear box on a "Bob Cat " tractor.
The video is of a smaller machine for cutting watch and clock wheels from 0.5 to 0.19 module
