SCREW TAP MANUFACTURING METHOD Russian patent published in 1997 - IPC

FIELD: mechanical engineering. SUBSTANCE: this is used in tool production for relieving upper parts of sides of teeth in entering cone of screw tap. This relieving operation is performed separately by one-side grinding wheel preset for required thread profile angle. In operation, grinding wheel is moved along entering cone by axial feed. At relieving left-hand side of thread profile, axial feed value is selected to be lower than pitch of thread, and at relieving right-hand side of thread profile it is larger than pitch of thread. Given in description are formulas for determining aforesaid feed values depending on pitch of thread, angle of profile and angle of entering cone of screw tap. EFFECT: high efficiency. 2 dwg