CENTERING METHOD OF LASER MEASURING INSTRUMENT

PURPOSE:To shorten a work time, and to raise a measuring accuracy by adjusting a relative position to a measuring object so that a laser light source passing through a hole of a reference plate of the front of the laser light source of a reflection mirror before its movement is irradiated on the same position before and after a movement of the reflection mirror. CONSTITUTION:In a centering work of a laser light 3 from a light source P of a laser head 1, and a reflection mirror 2 installed to a moving part of a machine, a reference plate 4 is installed through a magnet stand 5 to a fixing part of a machine, etc. on the front of the light source P side of the reflection mirror 2, so that the light 3 can pass through a hole 6 of the plate 4. Also, a position where the light 3 passes through the hole 6 and irradiates a marker 7 of the mirror 2 (position L1) before its movement is set as O, and the mirror 2 is moved by a distance L2 and set as a mirror 2', so that the light 3 passes through the hole 6 and irradiates a point O' (a mark point O before the movement) of the mirror 2'.