04.97
Programming of Traversing Blocks
4.5
Chaining with rapid traverse G76
The path programmed with G76 "chaining with rapid traverse" is traversed in each axis with
maximum traversing speed (MD31), the resulting path being dependent on the distances to be
traversed and the axis velocities.
The rapid traversing movements are programmed through the preparatory function G76 and
indication of the point of destination. The point of destination can be specified in absolute
dimension G90 or in incremental dimension G91. G76 is modally effective. With "chaining with
rapid traverse", one, two or all three axes can be traversed simultaneously.
Programming:
N10 G76 X10.000
N20 Y20.000
N30 X30.000 Y30.000
N10
N20
N30
v-t diagrams:
V
y
V
path
MD 31
t
Movement in the
coordinate system:
Y
X
10.
40.
10.
40.
t
t
V
x
MD 31
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
N10
a a a a a a
a a a a a a
a a a a a a
a a a a a a
N20
a a a a a
a a a a a
a a a a a
a a a a a
N30
N10:
The X-axis moves in rapid traverse (MD31 = e.g. 3000 mm/min) to position X10.000.
N20:
The Y-axis moves in rapid traverse (MD31 = e.g. 3000 mm/min) to position Y20.000.
N30:
The X and Y-axes move in rapid traverse to position X30.000/Y30.000. Each axis
traverses at its own maximum velocity (MD31). As the distance to traverse of the Y-
axis is shorter than that of the X-axis, the Y-axis reaches its point of destination
earlier.
In this example, "exact stop G60" is assumed to be the block transition
behaviour. In the chapter "block transitions", the different possibilities of
block transition are described in detail.
As for chaining in rapid traverse, the override is effective, the maximum
traversing velocity is only reached with 100% override.
©
Siemens AG 1997 All Rights Reserved 6ZB5 440-0VU02
4 – 7
WF 723 C (Programming Guide)
