Granite Measuring Table

A granite measuring table, also known as a granite surface plate, is a crucial tool in various industrial and metrological applications. Here is a detailed overview:

Characteristics

High Precision: It features an extremely flat and smooth surface, with high - grade granite measuring tables capable of achieving flatness tolerances within a few micrometers. This high - level precision makes it an ideal reference plane for accurate measurements.

Excellent Stability: Granite has a low coefficient of thermal expansion, meaning it is minimally affected by temperature changes. It also has high hardness and wear - resistance, ensuring that the measuring table maintains its geometric accuracy over long - term use.

Good Corrosion Resistance: It is highly resistant to acids, alkalis, and other chemical substances, preventing surface corrosion and damage from chemical reactions, which helps to maintain the accuracy and prolong the service life of the measuring table.

Applications

Machining Inspection: In the manufacturing industry, it is used to check the flatness, straightness, and parallelism of machined parts. Workers place the parts on the granite measuring table and use measuring instruments like dial indicators to measure the deviation of the part surface from the reference plane, ensuring that the parts meet the required accuracy standards.

Metrology and Calibration: It serves as a calibration benchmark in metrology laboratories. Other measuring instruments and fixtures, such as height gauges and square rulers, can be calibrated by comparing them with the granite measuring table to ensure the accuracy and traceability of the measurement system.

Assembly and Alignment: In the assembly of precision equipment, such as optical instruments and electronic devices, the granite measuring table provides a flat and stable platform. It is used to ensure the correct installation and alignment of components, thereby ensuring the overall performance and quality of the equipment.

Maintenance and Care

Regular Cleaning: Use a clean, soft cloth to wipe the surface of the granite measuring table regularly to remove dust, oil, and other contaminants. Avoid using hard or abrasive cleaning tools to prevent scratching the surface.

Proper Storage: Store the measuring table in a dry, clean, and temperature - controlled environment. Avoid placing it in an environment with large temperature and humidity changes to prevent deformation. It is advisable to place it on a special support frame to avoid direct contact with the ground.

Handle with Care: During use and transportation, handle the granite measuring table with care to avoid collisions, drops, and strong vibrations. Any damage to the surface or edges of the table can affect its measurement accuracy.

Periodic Calibration: To ensure its accuracy, the granite measuring table should be sent to a professional metrology institution for periodic calibration. The calibration cycle is usually determined according to the frequency of use and the required accuracy, generally once a year or as needed.