Patent ID: 8336225

Claim:
A measuring apparatus for measuring a counterbore hole chamfer depth of a workpiece, comprising: a positioning member configured for positioning the workpiece, the positioning member comprising a guiding hole for alignment with the counterbore hole of the workpiece; a support member positioned on the positioning member, the support member comprising a receiving hole aligned with the guiding hole; and a measuring device supported by the support member, the measuring device comprising a gauge, a retractable pole connected to the gauge and extending into the receiving hole, and a measuring head portion connected to the retractable pole and movably received in the guiding hole, the measuring head portion having a cone-shaped end with a cone angle less than a chamfer angle of the counterbore hole, the cone-shaped end extending through the guiding hole and configured for abutting an inner wall of the counterbore hole chamfer, thereby making the measuring head portion moving back in the guiding hole and the retractable pole retracted a distance, the gauge configured for calculating and displaying a depth of the counterbore hole chamfer based on the retracted distance of the retractable pole.