Iai-america XSEL-QX Manuel d'utilisateur Page 359

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Part 4 Commands
3. SCARA Coordinate System
A horizontal articulated robot uses three types of coordinate systems: base coordinate system, load
coordinate system and tool coordinate system.
When tool coordinate system No. 0 (= tool coordinate system offsets are 0) is selected, normally the robot
will position the center of the tool-mounting surface on the selected load coordinate system. If any of tool
coordinate system Nos. 1 to 127 (= tool coordinate system offsets are valid) is selected, the robot will
position the tool tip on the selected load coordinate system. Note that the SEL commands TMPI and TMLI
as well as jog commands on XY (tool) coordinates will be executed on the tool coordinate system.
3.1 Base Coordinate System (= Load Coordinate System No. 0)
This coordinate system covers the three-dimensional cartesian coordinates and rotating-axis
coordinates factory-defined in the robot.
The base coordinate system corresponds to load coordinate system No. 0 (load coordinate system
offsets are 0).
The XY-axis home is located at the base center (rotating center of arm 1).
The Z-axis home is located at the upper end of the valid Z-axis stroke.
The R-axis home is where the D-cut surface faces the –Xb direction.
The X-axis, Y-axis, Z-axis and R-axis on the base coordinate system are expressed as Xb, Yb, Zb
and Rb, respectively.
Xb
Yb
Rb
Zb
+Yb
–Yb
–Xb
+Xb
Top view of R-axis position
Center of tool-
mounting surface
D-cut surface
of R-axis
+Rb
–Rb
–Xb
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