In which CNC equipment should not use granite gas bearings?

Granite gas bearings are widely used as a bearing material in CNC equipment. It is known for its excellent properties such as high stiffness, high load capacity, and low thermal expansion. However, there are certain types of CNC equipment where granite gas bearings should not be used.

One such type of equipment is CNC machines that require high precision. Granite gas bearings are not suitable for high precision work because they do not provide the required level of accuracy. This is because the contact surface between the granite gas bearing and the spindle is uneven. The contact surface is made up of small pockets of gas that create a gas film between the two surfaces.

In high precision CNC machines, a high level of accuracy is required for the correct operation of the machine. Therefore, other types of bearings are used that provide the required level of accuracy, such as ceramic or metal bearings.

Another type of CNC equipment where granite gas bearings should not be used is in machines that require a high level of thermal stability. Granite gas bearings are not suitable for applications where there is a large temperature variation. This is because granite has a high thermal expansion coefficient, which means that it expands and contracts significantly with temperature changes.

In machines that require a high level of thermal stability, other types of bearings are used that have low thermal expansion coefficients. These include materials such as ceramics or metals.

Granite gas bearings are particularly suited for applications where there are moderate loads and moderate levels of precision are required. In this type of application, they provide excellent performance and durability.

In conclusion, granite gas bearings are a versatile material that can be used in a wide range of CNC equipment. However, they are not suitable for high precision applications or machines that require a high level of thermal stability. In these cases, other types of bearings should be used that provide the required level of accuracy and thermal stability.