Device and method for calibrating a robot

A device for calibrating a robot, comprising a fixing base;

• a first slide base slidably attached to said fixing base on a straight line thereof;
• a first displacement detecting means for measuring an amount of movement of said first sliding base with respect to said fixing base;
• a second sliding base slidably attached to said first sliding base on a straight line orthogonal to the sliding direction of the first sliding base;
• a second displacement detecting means for measuring an amount of movement of said second sliding base with respect to said first sliding base;
• a third sliding base slidably attached to said second sliding base on a straight line orthogonal to the sliding direction of the first and second sliding bases;
• a third displacement detecting means for measuring an amount of movement of said third sliding base with said second sliding base;
• and a universal joint, one end of which is fixed at said third sliding base, the other end of which is fixed at a tip end portion of a wrist of the robot, wherein one end is provided with a conical trapezoidal recess and a magnet incorporated at the bottom of said recess, and said other end is provided with a sphere detachably fitted into said recess.