Siemens SINUMERIK 802D Training Manual page 8

Section 2
The difference between a Manual machine and a CNC machine is a logical
difference based upon numerical values. This overview module and the
following CNC modules should help explain the myth of CNC.
ITS ONLY NUMBERS. No magic !!
Reference position Z
Zero Offset
Tool Offset
Zero Offset
SINUMERIK 802D sl Operating and Service Training Manual
Fundamentals of CNC Machines
Reference position X
Page 2
Notes
C102
C102