Disc-shaped measuring needle

The disc-shaped measuring needle is the "cross-section" of a high sphericity measuring ball, used to detect the retreat groove and groove inside the hole that cannot be reached by the star shaped measuring needle.

Although measuring with the "spherical edge" of a simple disc-shaped measuring needle is equally effective as measuring with the outer circle of a large-diameter measuring ball, it can only touch a small part of the surface of the measuring ball. Therefore, to ensure good contact with the tested features, the thinner disc-shaped measuring needle needs to be carefully adjusted for angle.

A simple disc-shaped measuring needle only needs to calibrate one diameter (usually using a ring gauge), but it is limited to effective measurements in the X and Y directions.

Adding a "hemispherical roller" to the disc-shaped measuring needle is sufficient for Z-direction calibration and measurement, but the center position of the hemispherical roller must be greater than the diameter of the measuring head.

Half spherical rollers can be calibrated with spherical or block gauges. Rotate and lock the disc-shaped measuring needle around its center to locate the "hemispherical roller" and adapt it to the actual application position.

The center of the disc-shaped measuring needle can also have an M2 thread, which can be used to fix the center seat of the measuring needle, enhancing the flexibility of measuring the bottom of the deep hole (some disc-shaped measuring needles are difficult to measure).

There are various diameter and thickness specifications for disc-shaped measuring needles, usually made of steel, ceramic, or ruby.

It is generally not recommended to use disc-shaped measuring needles on machine tools.

Naming convention:

M2 DSC D18 SLVS T2.2 L2.6 BR-Y

explain

M2 thread disc-shaped measuring needle, disc diameter 18mm. Made of silver steel with a thickness of 2.2mm and a length of 2.6mm. BR stands for measuring ball and roller, followed by "Yes" (Y) or "No" (N).