| 摘要 |
A plate-shaped jig (9) is fixed between a fixed-side electrode (5) and a moving-side electrode (6). The end of an arm is set to move by an external force in the direction the moving-side electrode (6) moves, and then the moving-side electrode (6) is moved toward the jig (9) and pressed against the jig (9) by such a force that the end of the arm is pushed up by a counterforce, the position of a robot in a tool coordinates system and the position of a gun-axis servomotor (7) are acquired as reference positions when the jig (9) is held between the moving-side electrode (6) and the fixed-side electrode (5) to release the holding of the fixed jig (9) with pressure. Thereafter, similarly , the position of the robot and the position of the gun-axis servomotor (7) are acquired to calculate the wear amount of the fixed-side electrode (5) and the moving-side electrode (6) from the respective differences from the reference positions.
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