Granite Surface Plates

A granite surface plate is a flat, precision-ground surface used as a reference or measuring base for various mechanical, engineering, and manufacturing applications. It is typically made of granite because granite possesses several desirable properties for this purpose. Here are some key features and uses of granite surface plates:

Flatness and Stability:

Granite is known for its excellent dimensional stability and resistance to warping or distortion. This makes it an ideal material for ensuring a flat and stable reference surface.
Hardness:

Granite is a hard, dense material, which means it can withstand the wear and tear associated with frequent use. It is resistant to scratches and abrasion, ensuring a durable and long-lasting surface.
Non-Magnetic:

Granite is non-magnetic, making it suitable for applications where magnetic interference must be minimized, such as in precision measurements using magnetic instruments.
Temperature Stability:

Granite has a low coefficient of thermal expansion, meaning it is relatively insensitive to temperature changes. This characteristic helps maintain the flatness of the surface plate over a range of temperatures.
Grinding and Finishing:

The surface of a granite surface plate is meticulously ground and finished to a high degree of precision. This ensures that the surface is as flat and smooth as possible, meeting strict tolerance requirements.
Applications:

Granite surface plates are commonly used in metrology (the science of measurement) for precision measurement and calibration of instruments. They serve as a stable and reliable reference surface for tools such as height gauges, dial indicators, and surface plates.
Quality Control and Inspection:

In manufacturing settings, granite surface plates are used for quality control and inspection processes. Parts and components can be placed on the surface plate for measurement and inspection to ensure they meet specified tolerances.
Layout and Marking:

Granite surface plates are also used for layout and marking operations. Engineers and machinists use them as a flat surface for laying out and inspecting components during the manufacturing process.
In summary, a granite surface plate is a precision tool that provides a flat and stable reference surface for accurate measurements and inspections in various industrial and engineering applications.