GRINDING METHOD IN VERTICAL SPINDLE DOUBLE HEAD GRINDER AND DEVICE THEREOF

PURPOSE:To make an optimum speed ratio settable according to machining conditions, by rotating both pressure receiving and applying plates of a vertical spindle double head grinder in the reverse direction by one driving source, while making the speed ratio variable at will. CONSTITUTION:A work W held by a rotary carrier 1 is rotated or revolved by a pressure applying plate 3 and a pressure receiving plate 10 whereby an end face of the work is ground by a grinding wheel 6 being set up the circumference. These plates 13 and 10 are rotated and driven by one driving motor in the reverse direction. Driving shafts 40 and 37 are coupled with each other by a differential gear mechanism 25, and with a worm 51 rotated, these shafts 40 and 37 can be rotated or driven at an optional speed ratio.