PURPOSE: To measure the central position or profile of a hole or groove with high precision by measuring two orthogonal ridge parts of the protruding part of a measuring pin by a laser measuring machine, and arithmetically processing the measured values.
CONSTITUTION: When a measuring part l is the guide pin insert hole 6 of a multicore ferrule, mutually orthogonal axial ridge parts 4 of respective measuring pins 2 inserted to two guide pin insert holes 6 are determined by a laser length measuring machine, and the radius portions of the measuring pins 2 inserted to the guide pin insert holes 6 are subtracted from the respective coordinate positions of the ridge parts 4 determined by this measurement, whereby the respective central positions of the measuring pins 2, or the respective central positions of the guide pin insert holes 6 can be determined. When the central positions are determined, the dimension between the two guide pin insert holes 6, and the standard line connecting the central positions of the two guide pin insert holes 6 can be determined. The outer diameter of the measuring pin 2 is preliminarily determined by the laser length measuring machine.
SAITO MASAMI
YANASE HIROYUKI
KANAI KEN
NAGASAWA SHINJI
NIPPON TELEGRAPH & TELEPHONE