
B-63323EN-1/03 10.TOOL FUNCTION
- 1019 -
10.4.7 Rotary Table Dynamic Fixture Offset
General
If the position of a workpiece is set as a reference fixture offset with
respect to the position of the rotary table, a fixture offset after rotation
of the rotary table can be automatically calculated from the angular
displacement of the rotary table, and the workpiece coordinate system
can be created accordingly. Once a reference fixture offset is set, the
workpiece coordinate system can be dynamically held for any position
of the rotary table. The sum of the fixture offset and the workpiece
origin offset determines the origin of the workpiece coordinate system.
X
Y
X
Y
X
Y
F
0
F
θ
0
θ
Z
W
Origin of machine
coordinate system
W:Workpiece origin offset
θ
0
:Reference angle
F
0
:Reference fixture offset
θ :Angular displacement about
the rotation axis
F:Fixture offset
C
Center of
rotation axis
Fig. 10.4.7 (a) Fixture Offset
- Fixture offset command
When the G54.2 Pn command is specified, a fixture offset is calculated
from an angular displacement about the rotation axis and data specified
as n, and the fixture offset function is enabled. If zero is specified for n,
the fixture offset function is cancelled.
- When a movement about a rotation axis is specified in G54.2 mode
If a movement about a rotation axis involved in fixture offset is
specified in G54.2 mode, the coordinate about the rotation axis at the
end of the block is used to calculate the fixture offset. Movement is
made to the position on the workpiece coordinate system determined by
the fixture offset.