PURPOSE: To suppress the disturbance and thermal deformation and improve the machining precision by machining a work under the specific conditions when a grinding wheel formed into the index teeth shape and a circular work are relatively reciprocated and the index teeth of the work are ground by the grinding wheel.
CONSTITUTION: A grinding wheel 17 formed into the index teeth shape and a circular work W are relatively reciprocated, and the index teeth of the work W are ground by the grinding wheel 17. The grinding is performed under the following conditions: (a) The vertical Y position between the dressing position H1 of the grinding wheel 17 by a dresser 12 and the machining position H2 of the work W by the grinding wheel 17 is made nearly the same as the upper face of a table 2. (b) A dresser grinding wheel 13 is arranged so that the intersection position of both slopes of the grinding wheel 17 and the rotation center position of an index table 11 are located on the same line in the moving direction of the table 2. (c) Cold air is sprayed to the machining portion and dressing portion of the work W, grinding wheel 17, and dresser grinding wheel 13 respectively.
TADA AKIRA
KUZUI YASUO
