
21. AXES CONTROL
B–63502EN/01
NC FUNCTION
190
A polygonal figure can be machined by turning the workpiece and tool
at a certain ratio.
D Rotation ratio of the workpiece and tool
D Number of tool teeth
The polygon can be a quadrilateral or hexagon according to the above
machining conditions.
Compared with the machining performed by using C and X axes with
polar-coordinate compensation, this machining requires shorter time. It,
however, cannot form a precise figure of a polygon. Generally, this
method is used for machining of square or hexagonal bolt heads or
hexagonal nuts.
Example)
Rotation ratio of the workpiece and tool : 1 : 2
Number of teeth : Three at every 120° (for a hexagon)
Workpiece
Tool
The rotation of the tool for polygonal turning is controlled by the CNC
control axis. Hereafter, the rotation axis of this tool is called B axis.
Command G51.2 controls the B axis so that the ratio of the tool speed to
the speed of the workpiece (specified by the S command beforehand)
attached to the spindle becomes the specified value.
The synchronization between the spindle and B axis is canceled by the
command below.
G50.2 ;
21.7
POLYGONAL
TURNING
(G50.2, G51.2)
(T series)
T series