
Chapter 22 Appendices
22-5
(5) 4th-axis figure
The 4th-axis figure is defined by a value of the 4th-axis component.
The robot can take two different 4th-axis figures--SINGLE 4 and DOUBLE 4. If the
4th axis rotates by -180°<θ
4≤180° in mechanical interface coordinates, the figure is
SINGLE 4; if it rotates by 180°<θ
4≤185° or -185°<θ4≤-180°, the figure is DOUBLE 4.
The robot takes quite different figures when θ
4 is 180° or 181°. Take special care
when changing any position data fort the 6th-axis figure. For example, supposing
that you want to change the 4th-axis figure at θ
4=181°, the robot will take the 4th-axis
figure at θ
4=-179° if you make no figure modification.
Figure 5. 4th-Axis Figure
J4 = 178
°
SINGLE 4
J4 = -182
°
DOUBLE 4
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