What is the measuring tool used to measure the bore of a graphite copper bushing?

Micrometer for inside diameter

This is one of the most commonly used tools for measuring the bore of graphite copper bushing. It is highly accurate and can accurately measure the diameter dimensions of the bore. The measuring range of the micrometer can be varied according to different models, and it can usually measure bores from a few millimeters to several hundred millimeters.

The principle of operation is to convert the rotary motion of the micrometer screw into linear displacement by means of a helical sub-drive, so as to accurately measure the dimensions of the bore. When measuring the inner hole of graphite copper bushing, the probe of the micrometer is put into the inner hole, and the micrometer screw is adjusted so that the probe is in good contact with the wall of the inner hole, and the measured value is read. For example, for graphite copper bushing bore measurements requiring an accuracy of 0.01mm or so, the ID micrometer is a good choice.

I.D. Gauges

The I.D. Gauge is mainly used for high-precision measurement of bore size and shape error. It consists of a head, a stem and a probe. The gauge head is usually a percentage gauge, which can accurately display the change of the measured value.

During the measurement, the probe of the bore gauge is placed into the bore of the graphite copper bushing, and by adjusting the position of the gauge rod so that the probe oscillates in the bore, the gauge head will show the deviation value of the bore diameter relative to the standard size. This tool is also very effective for measuring the roundness, cylindricity and other shape errors of the bore of graphite copper bushings. Its accuracy can generally reach 0.01mm, and it is widely used in the mass production of graphite copper bushing, which requires fast, high-precision measurements of the inner holes of multiple products.

Coordinate Measuring Machine (CMM)

The CMM is a high-precision, multi-functional measuring device. It can accurately measure the diameter, roundness, cylindricity and the positional accuracy of the bore relative to other surfaces of graphite copper bushings and other parameters by measuring the dimensions on three coordinate axes in space.

Its working principle is to use the probe in the three-dimensional space to move, collect the coordinates of the surface of the object to be measured data, and then through the computer software for data processing and analysis. For graphite copper bushings with complex shapes and very high accuracy requirements, such as those in the aerospace field or precision instruments, CMMs can provide very accurate bore measurements. However, CMMs are expensive and relatively complex to operate.