Siemens Sinumerik 840D Operating Turning page 82

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Zero point offset G54

For machining the work piece the work piece coordinate system (WCS) is

available on the machine.

This can be freely chosen by the operator depending on the manufacturing

conditions or according to the usual workshop practice.

By this the machine zero point is offset by a defined distance, thus obtain-

ing a work piece zero point that is directly referred to the item to be ma-

W Workpiece zero point

Zero point offset

With this code the work piece zero point can be defined on the machine.

The following image shows how by programming G54 the position of the

work piece zero point has been shifted to the right hand planar face of the

turned item.

The zero point on the machine is set in JOG mode and is activated in the

program with G54.

By this the coordinate origin for the program and the machine zero point

coordinate are now identical.

Programming example:

N10 G18 G54 ...

N20 G00 X200 Z300

N30 T1; Roughing tool

Code G54 (modally operative)

Finished planar face of the

(Work piece coordinates

along the longitudinal axis are

Explanation:

Plane selection, call-up of the

zero point offset G54

Approach to the tool change point

Call-up of the tool T1

840D/828D SINUMERIK Operate

Sinumerik 828d