Bourn & Koch 600H

The Bourn & Koch 600H is the largest H-Series horizontal CNC gear hobber, built around long and heavy shafts: 600 mm (23.6 in) maximum workpiece diameter, a 12 module pitch range and 2,400 mm (94.5 in) of maximum axial travel. At approximately 38,000 lb (17,237 kg) it weighs more than twice as much as the 400H.

What grows from the 400H is the work envelope, not the cutting power. Spindle power is the same 15 kW (20.1 hp). Compared with the 400H, pitch nearly doubles, from 6.4 Module to 12 module, and axial travel goes from 1,250 mm (49.2 in) to 2,400 mm (94.5 in). Coarse teeth on this machine are a matter of patience: the hob runs at up to 350 rpm, the work spindle at 40 rpm, and the automatic double-cut cycle with speed and feed change between cuts is there for exactly this kind of work.

Long parts need support, and the option list reflects it. A heavy-duty hydraulic tailstock, an adjustable roller or hydraulic steadyrest and an extended bed are optional, as are automatic loading and a chip conveyor. A CNC operated tail center, a programmable Y-axis, an integral direct-drive work spindle and automatic lubrication come as standard. Hobs can be 250 mm (9.8 in) long and 200 mm (7.9 in) in diameter, with 200 mm (7.9 in) of automatic hob shift.

Bourn & Koch lists the 600H as 6 axis CNC gear hobbing, with the control named as Fanuc Oi-F and its own HMI on top. The hob swivel covers +/- 45 deg. and is power-programmable. Standard production is stated as AGMA class 9-10 gears on external spur and helical teeth.