The pitsukuhui - do manner null in body of revolution

摘要

PURPOSE:To put pick feed into practice with certainly, by dividing the whole circumference into two areas with a straight line connecting the specified turning angle position and the turning center of a model, and performing no pick feed at the time of admission from the first to the second area of a stylus, but performing it at the time of the admission from the second to the first area the other way. CONSTITUTION:The whole circumference of a model MDL is divided into two parts, or both areas AI and AII by a straight line connecting a limit line LL' being specified by the specified turning angle thetaL, that is, a point PL of the angle thetaL to a turning center OM of the model MDL, and an area where a stylus ST exists in the initial stage at time of starting of rotor copying is set down to the first area AI. And, when the stylus ST is relatively rotated to the model MDL by the rotor copying, no pick feed takes place when the stylus ST advances into the second area AII from the first area AI, but the pick feed is performed when the stylus advances into the first area AI from the second area AII. Thus, the pick feed can be done per rotation surely.