BORING DEVICE FOR WORKPIECE HAVING HOLE AT ECCENTRIC POSITION FROM AXIAL CENTER

PROBLEM TO BE SOLVED: To solve a problem of a large number of set-up manhours in conventional finishing work to a workpiece 14 having a hole 13 including processing the hole 13 with an inner surface grinding machine, and processing a shaft part 57 with an outer surface grinding machine separate from it, in which the workpiece 14 need be transferred to be aligned each time. SOLUTION: Fig. (a) shows processing to a pin hole. The workpiece 14 is aligned to a rotary main shaft 29, it is clamped by clamp means 31 and 32, and the hole 13 is processed with a tool 26, while a grinding wheel 56 is held stand-by. Fig. (b) shows processing to the shaft part. The workpiece 14 is kept as it is, and the tool 26 is held stand-by. Next, the workpiece 14 is rotated at high speed, and the grinding wheel 56 is applied, so the shaft part 57 is processed. Processing to the shaft part in the workpiece and processing to the hole at an eccentric position from an axial center can be executed without removing the workpiece from the processing device once it is set on it. Set-up manhours can be largely reduced. Since a plurality of processes can be executed by the single processing device, finishing precision is improved.