
6. INTERPOLATION FUNCTION
B–64113EN–1/01
352
Polygonal turning means machining a polygonal figure by rotating the
workpiece and tool at a certain ratio.
Workpiece
Tool
Workpiece
Fig. 6.9 (a) Polygonal turning
By changing conditions which are rotation ratio of workpiece and tool and
number of cutters,the machining figure can be changed to a square or
hexagon. The machining time can be reduced as compared with polygonal
figure machining using C and X axes of the polar coordinate. The
machined figure however, is not exactly polygonal. Generally, polygonal
turning is used for the heads of square and/or hexagon bolts or hexagon
nuts.
Fig. 6.9 (b) Hexagon bolt
This function controls the workpiece (spindle) and tool (rotation tool
axis) so that the relationship between the spindle speed and tool speed is
maintained at a constant ratio specified in a command given to the CNC.
(For the principle of polygonal turning, refer to Section 18.1, Part II of the
“Operator’s Manual (For Lathe).”)
Following axis can be selected as the tool rotation axis:
· CNC controlled axis (servo axis)
In the following descriptions, the term polygonal turning refers to a
turning operation in which a servo axis is used as the tool rotation axis
(See Section 6.9.1.).
6.9
POLYGONAL
TURNING
(T SERIES)