Why did the bridge CMM choose granite as the bed material?

The bridge CMM, also known as a bridge-type coordinate measuring machine, is an essential tool that is used to measure the physical characteristics of an object. One of the most important components of a bridge CMM is the bed material upon which the object is to be measured. Granite has been used as the bed material for the bridge CMM for a variety of reasons.

Granite is a type of igneous rock that is formed through the cooling and solidification of magma or lava. It has a high resistance to wear, corrosion, and temperature fluctuations. These properties make it an excellent material for use as the bed of a bridge CMM. The use of granite as a bed material ensures that the measurements taken are always precise and accurate, as the bed does not wear or deform over time.

Additionally, granite is known for its low thermal expansion coefficient, which means that it does not expand or contract significantly due to changes in temperature. This is important because temperature fluctuations can cause the measurements taken by the CMM to be inaccurate. By using granite as the bed material, the CMM can compensate for any temperature changes, ensuring accurate measurements.

Granite is also an extremely stable material. It does not deform under pressure, making it an ideal material for use in the bridge CMM. This stability ensures that the object being measured remains stationary throughout the measurement process, ensuring that accurate measurements are taken.

Another advantage of granite is its ability to dampen vibrations. Any vibrations that occur during the measurement process can cause inaccuracies in the measurements taken. Granite has the ability to absorb these vibrations, ensuring that the measurements taken are always precise.

In conclusion, the use of granite as the bed material for the bridge CMM has many advantages. It is a stable, precise, and reliable material that ensures accurate measurements are taken every time. The material is resistant to wear, corrosion, and temperature fluctuations, making it an ideal choice for the demanding environment of a metrology lab. Overall, the use of granite as the bed material is a smart choice for any organization that requires precise and accurate measurement of physical objects.