Basic Coordinate System (Bcs); Wokpiece Coordinate System (Wcs) - Siemens SINUMERIK 802D Training Manual

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Section 2
Overview of the coordinate system
Notes

Basic Coordinate System (BCS):

The Basic Coordinate System works between the Machine Coordinate
System and the Workpiece Coodinate System. If the value of the Basic
Coordinate System is changed, then the Workpiece Coordinate System
will move respectively.
The Basic Coordinate System is activated with G500. When G500 is pro-
grammed the modally active (G54) will be deactivated.
With G54 active a movement can be programmed with respect to the BCS
by using the blockwise G code G53.

Wokpiece Coordinate System (WCS):

The workpiece coordinate system is the offset between the BCS and the
origin of the component.
When the BCS system has no value, then the WCS is the offset to the
MCS system.
7 Zero offsets are therefore available to the operator/programmer.
G500 - Basic Zero Offset
G54 - 1st. Zero Offset
G55 - 2nd. Zero Offset
G56 - 3rd. Zero Offset
G57 - 4th. Zero Offset
G58 - 5th. Zero Offset
G59 - 6th. Zero Offset
Example:
Programmed
G0 G153 X0 Y0 Z0
Typically the following position will be reached, dependant upon the machi-
ne builder.
C74
C74
SINUMERIK 802D sl Operating and Service Training Manual
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