Tool Detector

A tool detector which is disposed on a table of a computer numerical control (CNC) machine tool provided with at least one rotating shaft, three linear axes, and a control device comprising:

• a right-angle triangular base which is provided with a first angular position, a second angular position, and a third angular position;
• a main light ray is emitted from a light source disposed on the first angular position to a plane mirror arranged at the second angular position so that a reflected light ray is generated due to the plane mirror and incident into a coordinate origin at a center of symmetry of a quadrant detector located at the third angular position to generate a light receiving area;
• wherein the quadrant detector is disposed by a diagonal method in which a coordinate axis of the quadrant detector is rotated with respect to a coordinate origin through an angle of inclination and arranged at the third angular position;
• and
• an automatic controller which includes a conserved common variable module and a correcting unit;
• the control device drives a standard bar to move and form a shaded area on the quadrant detector;
• then a reference coordinate is defined by projection of the shaded area in multi-dimensional directions in a measurement space of the main light ray while a position coordinate is defined by projection of the shaded area in multi-dimensional directions in a complex vector space of the reflected light ray;
• the automatic controller converts orthogonal projection of the reference coordinate and the position coordinate on a hypotenuse of the right-angle triangular base into a spatial coordinate which is a crossing zero;
• then the control device drives the standard bar to the reference coordinate and the position coordinate repeatedly at a time interval to get a number of N+1 spatial coordinates which are used for measurement of a thermal variable of the CNC machine tool.