Computer Drive Installation Instructions

12.93 12 Functional Descriptions

12.18.16 Examples

12.18.16.1 Overview of application examples

• Hobbing

• Inclined infeed axes

12.18.16.2 Hobbing

Interrelated functions in hobbing process

The following diagram shows the configuration of a typical hobbing machine.

The machine comprises five numerically controlled axes and a controlled main spindle.

These are:

• the rotary motion of the workpiece table (C) and hobber (B),

• the axial axis (Z) for producing the feed motion over the entire workpiece width,

• the tangential axis (Y) for shifting the hobber along its axis,

• the radial axis (X) for the infeed of the cutter to tooth depth,

• the cutter swivel axis (A) for setting the hobber in relation to the workpiece depending on

the cutter and tooth lead angles.

The machine can also be equipped with further NC axes to obtain an automatic workpiece and

tool changer.

Definition of axes on a hobbing machine (example)

X = Radial axis

Y = Tangential axis (leading drive 3)

Z = Axial axis (leading drive 2)

A = Cutter swivel axis

C = Workpiece rotary axis (following drive)

B = Cutter rotary axis, main spindle (leading drive 1)

12–175

SINUMERIK 840C (IA)