An Application of Direct Drive Servomechanism to NC Hobbing Machine

Abstract

This short paper describes an application of a direct drive servomechanism to a NC hobbing machine. Since the backlash of the hob-spindle and work-table of the NC hobbing machine gives some bad influences to the gear cutting process, the authors tried to remove this backlash by means of direct drive.
In order to obtain some basic data of the direct drive NC hobbing machine, a prototype was made. This prototype has the ability to cut a spur gear whose module is 1.5 and whose pitch diameter is 57 mm at one time cut.
Some cutting experiments verified that the direct drive servomechanism is usefull for not only robot mechanism but also NC gear cutting machine.