NORMAL-LINE DETECTION METHOD, NORMAL-LINE DETECTION DEVICE, AND MACHINE TOOL HAVING NORMAL-LINE DETECTION FUNCTION

摘要

A method for finding the normal vector of a measurement surface of a measurement target measures distances to the measurement target using at least one distance detector and calculates the normal vector. The normal vector is found by calculating the exterior product of a first vector which connects a first measurement point and a second measurement point and a second vector which connects a third measurement point and a fourth measurement point and is shifted in parallel such that an end thereof is set at any one of the first and second measurement points.