The Third Axis - Siemens sinumerik 808d Programming And Operating Manual

Programming principles
1.3 Axis movements
1.3.15

The third axis

Prerequisite
The control system must be designed for three axes.
Functionality
Depending on the machine design, the third axis can be required. These axes can be
implemented as linear or rotary axes. The identifier for these axes is defined by the machine
manufacturer (e.g. B).
For rotary axes, the traversing range can be configured between 0 ...<360 degrees (modulo
behavior) or -360 degrees/+360 degrees if there is no modulo axis is present.
With an appropriate machine design, a 3rd axis can be traversed linear simultaneously with
the remaining axes. If the axis is traversed in a block with G1 or G2/G3 with the remaining
axes (X, Z), it does not receive a component of the feedrate F. Its speed conforms to the
path time of axes X, Z. It movement begins and ends with the remaining path axes.
However, the speed cannot exceed the defined limit value.
If a block is programmed with this 3rd axis only, the axis will traverse using the active
feedrate F when the G1 function is executed. If the axis is a rotary axis, the unit of
measurement for F is degrees/min with G94 or degrees/rev. of the spindle with G95.
For these axes, offsets can be set (G54 ... G59) and programmed (TRANS, ATRANS).
Programming example
The 3rd axis is a swivel axis with the axis identifier B
N5 G94
N10 G0 X10 Z30 B45
N20 G1 X12 Z33 B60 F400
N30 G1 B90 F3000
Special instructions for rotary axes: DC, ACP, ACN
For example, for rotary axis A:
A=DC(...)
A=ACP(...)
A=ACN(...)
Example:
N10 A=ACP(55.7)
54
; feedrate F in mm/min or degrees/min
; X-Z traverse path with rapid traverse, B at the same
time
; X-Z traverse path at 400 mm/min, B at the same time
; Axis B traverses alone to position 90 degrees at a
speed of 3000 degrees/min
; Absolute dimensions, approach position directly (on
the shortest path)
; Absolute dimensions, approach position in positive
direction
; Absolute dimensions, approach position in negative
direction
; approach absolute position 55.7 degrees in positive
direction
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0