2 Operation
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R: Arc radius or parameter in canned cycles.
S: Spindle speed.
T: Tool command.
U: Incremental positioning command on X-axis.
W: Incremental coordinates on Z-axis.
X: Absolute positioning command on X-axis.
Z: Absolute positioning command on Z-axis.
C: Chamfer by line method between Program Node and respective Node.
R: Chamfer by round arc method between Program Node and respective
Node.
A: Chamfer by combined line and angle method between Program Node and
respective Node.
Each block has a specified format and this format must be used during programming.
Incorrect formatting can result in code rejection or major errors.
Each block has a serial number for identification. Though the serial number is not
essential, it is recommended to use it for easy search. The serial number contains the
letter “N” followed by some digits. The number can be generated automatically or
manually typed from the keyboard when editing the program. (Refer to Chapter IV).
The line number order is not followed, but line numbers must be unique. The program
runs in order of blocks from top to bottom rather than their serial numbers. For
example:
Ex: N10……(1) program execution order
N30……(2)
N20…....(3)
N50…....(4)
2.2.1.4. Coordinate System
Fabrication of a work-piece with a lathe is accomplished by the rotation of the spindle
and cutting motion of the tool mounted on the machine. The tool can move in an arc
or straight line. A coordinate system is used to describe the geometrical position of the
intersecting point and end point of an arc or line. The cutting action is done by the
controlled change of these geometrical positions (positioning control).
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