Staas & Halsey
Method and apparatus for involute interpolation
 An involute interpolation method for a computerized numerical control apparatus having a rotational axis and a linear axis is effected by giving commands for a direction in which an involute curve (IC) rotates, the position of the center of a base circle (BC), and the radius (R) of the base circle, and interpolating the involute curve (IC) according to the commands. Interpolated distances are converted to those along the rotational axis and the linear axis for the control of a machine tool (9). 
Fanuc, Ltd.
G G
G05B G05B
additional inventional
Hideaki Kentaro Masafumi
Kawamura Fujibayashi Sano