Patent ID: 8177210

Claim:
A work positioning method comprising a main positioning means and an auxiliary positioning means placed to protrude on a reference plane to determine a position of a work by inserting the main positioning means into a main positioning hole formed in the work and inserting the auxiliary positioning means into an auxiliary positioning hole formed in the work, wherein the main positioning means includes a main positioning insert part having a circular outer peripheral shape to be inserted in the main positioning hole, the auxiliary positioning means includes: a base block member formed with at least two first smooth surfaces opposing each other and parallel with a straight line joining the main positioning means and the auxiliary positioning means; a sliding part formed with second smooth surfaces in parallel with the straight line and in correspondence with the first smooth surfaces of the base block; and an auxiliary positioning insert part provided above the sliding part, the auxiliary positioning insert part having a circular outer peripheral shape to be inserted into the auxiliary positioning hole, wherein when the work is to be positioned, the main positioning insert part of the main positioning means is inserted into the main positioning hole, and the sliding part of the auxiliary positioning means is guided by the first smooth surfaces to move on the straight line to absorb a pitch error between the main positioning hole and the auxiliary positioning hole, and the auxiliary positioning insert part is inserted into the auxiliary positioning hole, wherein when the auxiliary positioning insert part is inserted into the auxiliary positioning hole to position the work, the sliding part is not inserted in the auxiliary positioning hole.