Why does the CMM choose to use granite base?

The Coordinate Measuring Machine, also referred to as the CMM, is widely regarded as one of the most useful tools for measuring and analyzing geometric features of any object. The accuracy of CMM is incredibly high, and it is critical for a wide range of manufacturing and engineering applications.

One of the key features of a CMM is its granite base, which serves as the foundation for the entire machine. Granite is an igneous rock composed mainly of quartz, feldspar, and mica, which makes it an excellent material for the CMM base. In this article, we will explore why the CMM chooses to use granite base and the advantages of this material.

Firstly, granite is a non-metallic material, and it is not affected by temperature changes, humidity, or corrosion. As a result, it provides a stable base for the CMM equipment, which ensures the accuracy of measurement results. The granite base can maintain its shape and size over time, which is essential for maintaining the machine's precision.

Secondly, granite is a dense material that has excellent shock absorption properties. This property is critical in metrology applications, which require precise and accurate measurements. Any vibration, shock, or distortion during measurement can significantly affect the measurement accuracy and precision. Granite absorbs any vibrations that may occur during the measurement process, which leads to more accurate results.

Thirdly, granite is a naturally occurring material that is abundant in the earth's crust. This abundance makes it affordable compared to other materials, which is one of the reasons why it is a popular choice for the CMM base.

Granite is also a hard material, making it an ideal surface to mount components and workpieces. It provides a stable platform for the workpiece, reducing any inaccuracies that may arise from the movement of the object during the measurement process.

In conclusion, the CMM chooses to use granite base because of its excellent vibration absorption properties, thermal stability, high density, and affordability. These properties ensure the accuracy of the measurement results and make it the most suitable material for the CMM base. Hence, the use of granite base in CMM is a testament to the technological advancements that have made the metrology industry more accurate, efficient, and reliable than ever before.