Zeros And Reference Points; Reference Points In Working Space - Siemens SINUMERIK 828D Function Manual

K2: Axis Types, Coordinate Systems, Frames

10.3 Zeros and reference points

10.3 Zeros and reference points
10.3.1

Reference points in working space

Zeros and reference points
The neutral position of the machine is obtained from the coordinate axes and the constructive characteristics of
the machine. The zero of the coordinate system is obtained by defining a suitable reference point on the machine
in its neutral position.
The position of the coordinate systems (MCS, BCS, BZS, SZS, WCS) is determined by means of zeros.
Zero points
M = Machine zero
W = Workpiece zero
Machine zero M
The machine zero M defines the machine coordinate system MCS. All other reference points refer to the machine
zero.
Workpiece zero W
The workpiece zero W defines the workpiece coordinate system in relation to the machine zero M. The
programmed part-program blocks are executed in the workpiece coordinate system WCS.
Reference point R
The position of the reference point R is defined by cam switches. Reference point R calibrates the position
measuring system.
With incremental encoders, the reference point must be approached every time the control power is switched on.
The control can only then work with the measuring system and transfer all position values to the coordinate
systems.
Toolholder reference point T
The toolholder reference point T is located on the toolholder locator. By entering the tool lengths, the control
calculates the distance between the tool tip (TCP Tool Center Position) and the toolholder reference point.
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Reference points
R = Reference point
T = Toolholder reference point
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions