CHECKING TOOL FOR METERING DISTANCE BETWEEN ADJACENT SINKING GROOVES IN INNER HOLE OF MECHANICAL PART

摘要

A checking tool for metering a distance between adjacent sinking grooves in an inner hole of a mechanical part comprises a gauge block (1), an end cover (2), a sliding piece (3), a pin (4), a base (5), a pin seat (6), a support (7), a measuring rod (8), a spring (9), a barrel (10), and a dial indicator (11). The base (5) is provided with the sliding piece (3) facing to an inner end face of a workpiece, at least three concentric circular arc grooves (5.1) are provided on the end face of the base (5), and paired eccentric arc grooves (3.1) are also provided on the sliding piece (3); the pin (4) connected to the pin seat (6) passes through the base (5) and the sliding piece (3); the sliding piece (3) is limited by the end cover (2) along an axial direction; and the pin seat (6) rotates relative to the base (5) so as to realize radial expansion displacement of the sliding piece (3). A measuring head is formed by the dial indicator (11), the measuring rod (8), the spring (9) and the barrel (10). By positioning the sides of adjacent sinking grooves in an inner hole, the present invention converts the measurement for a distance between the adjacent sinking grooves in the inner hole into depth measurement; the present invention is simple in structure and convenient and fast to operate; the distance between the adjacent sinking grooves in the inner hole of a mechanical part is accurately measured by using a measuring tool with a conventional length; and the machining deviation size and deviation direction are objectively reflected by quantitative detection, such that the improvement for subsequent machining quality is facilitated.