Ultrahigh Speed Machining Of High Helical Gears And Worm Gears CNC HIGH HELICAL GEAR HOBBING MACHINE NS-100 NS-100 This 4-axis CNC horizontal gear hobbing machine is designed for high-speed machining of automobile speedometer gears and worm gears with helix angles ranging from 60°to 90°. Employing an entirely new concept, the machine can shorten machining time to 1/2 or 1/5 compared with conventional machining methods. Machining Time Comparison Workpiece Specification Machining Condition NS-100 Conventional Outer diameter 45mm Cutting speed 1 1 Module M1.25 Spindle speed 398rpm 450rpm Helix angle 75°RH Feed rate Z1=30mm/min Z2=60mm/min Z3=20mm/min f=0.2mm/rev Number of thread 3 threads Cutting time 35sec. 2min40sec.