METHOD FOR FORMING ELLIPTIC SHAPE, ROTATING ELLIPSOID, HYPERBOLIC SHAPE, ROTATING HYPERBOLOID, AND PARABOLIC SHAPE

摘要

PURPOSE:To accurately form an object having an elliptic, hyperbolic, or parabolic outline or its rotating body under simple control by successively and straight moving a cutting tool or the like on an object to be worked to shave off the object. CONSTITUTION:Two fixed points F1, F2 are determined on the object 1 to be worked and a circle with a radius longer than the distance between the points F1, F2 is plotted around the point F1. An optional point An is plotted on the circle and the object 1 is cut out by the cutting tool or the like along the vertical bisector of the segment F2An. A similar circle is plotted around the point F2 and the object 1 is cut out by the similar method to form an elliptic shape. When the object 1 is cut out while rotating the object around the rotation axis shown by a straight line F1F2, a rotating ellipsoid can be formed. In addition, objects having hyperbolic and parabolic outlines and their rotating bodies can be formed by similar methods. Consequently, cutting control can be simply and easily executed.