Absolute/Incremental Dimensioning: G90, G91, Ac, Ic - Siemens SINUMERIK 802D sl Programming And Operating Manual

Programming
3.2 Positional data
● Metric dimension, G71 applies for all linear axes in the block, until revoked by G70 in a
● Inch dimension as for G70, but applies also for feedrate and length-related setting data.
● Metric dimension as for G71, but applies also for feedrate and length-related setting data.
● Diameter programming, DIAMON on
● Diameter programming, DIAMOF off
Diameter programming, DIAM90 for traversing blocks with G90. Radius programming for
traversing blocks with G91.
3.2.2

Absolute/incremental dimensioning: G90, G91, AC, IC

Functionality
With the instructions G90/G91, the written positional data X, Z, ... are evaluated as a coordi-
nate point (G90) or as an axis position to traverse to (G91). G90/91 applies for all axes.
Irrespective of G90/G91, certain positional data can be specified for certain blocks in abso-
lute/incremental dimensions using AC/IC.
These instructions do not determine the path by which the end points are reached; this is
provided by a G group (G0, G1, G2 and G3... see Chapter "Axis Movements").
Programming
G90
G91
Z=AC(...)
Z=IC(...)
Figure 3-3
Absolute dimensioning G90
With absolute dimensioning, the dimensioning data refers to the zero of the coordinate sys-
tem currently active (workpiece or current workpiece coordinate system or machine coordi-
3-18
following block.
; Absolute dimension data
; Incremental dimension data
; Absolute dimensioning for a certain axis (here: Z axis), non-modal
; Absolute dimensioning for a certain axis (here: Z axis), non-modal
Different dimensioning types in the drawing
Programming and Operating manual, 06/2006, 6FC5398-4CP10-0BA0
Grinding