上海维宏电子科技股份有限公司
Weihong Electronic Technology Co., Ltd.
Specialized, Concentrated, Focused 3
are denoted by X, Y and Z, which are normally referred as basic coordinate axes. The correlation of X,
Y and Z axes follows ―the Right Hand Rule‖, as shown in Fig. 2-2. The thumb points in the +X
direction, the index finger points in the +Y direction, and the middle finger points in the +Z direction.
+Y
+X
+Z
+Y
+C
+A
+B
+Z
+X
+Y
+X
+Z
+X+Y+Z
+A+B
+C
Fig. 2-2 Machine Tool Coordinate Axes
Circle feed coordinate axes swiveling around X, Y and Z are respectively denoted by A, B, and C.
According to the Right Hand Screw Rule, the thumb points in +X, +Y and +Z direction, while the index
and middle finger points in +A, +B, and +C direction of circle feed motion. The feed motion of CNC
machine can be realized by spindle driving the tool or the worktable driving the workpiece. The
positive directions of coordinate axes mentioned above are directions of tool feeding relative to the
supposedly stationary workpiece. If the workpiece is kinetic, the coordinate axes are marked with ―’‖.
According to relative motion, the positive direction of workpiece movement is opposite to that of tool
movement, that is:
+X =-X’, +Y =-Y’, +Z =-Z’
+A =-A’, +B =-B’, +C =-C’
Likewise, their negative directions are contrary to each other.
The directions of machine coordinate axes depend on the type of machine tool and the layout of
each component. For a milling machine:
Z: Z-axis coincides with the main spindle axis, and the direction of tool moving away from
workpiece is the positive direction (+Z);
X: X-axis is perpendicular to Z-axis and parallel to the clamped surface of workpiece. For a single
column vertical mill, if the user faces the spindle and looks in the column direction, right moving
direction is the positive direction of X-axis (+X);
Y: Y-axis, X-axis and Z-axis together constitute a coordinate system abiding by right hand rule.
To Next Page
Loading...
Need help?
General
