Surface Plates

Granite is chosen for its extreme hardness, low thermal expansion, and resistance to corrosion. Unlike cast iron, HK Calibrations granite plates will not burr if scratched, ensuring that a small nick doesn't ruin the flatness of the entire surface, which is vital for high-precision Australian engineering.

These grades indicate the "flatness tolerance" of the plate. HK Calibrations supplies Grade 0 for inspection laboratories, Grade 1 for high-precision toolrooms, and Grade 2 for general workshop use, allowing you to choose the level of accuracy required for your specific manufacturing standards.

To prevent abrasive wear, the surface must be kept free of dust and grit. HK Calibrations recommends using a dedicated surface plate cleaner after every use and keeping the plate covered when not in service to protect it from the environmental contaminants found in busy Australian workshops.

Yes, because granite plates are exceptionally heavy, they require stable, levelled support. HK Calibrations offers stationary and mobile stands designed to support the weight evenly and prevent "sagging," ensuring the plate remains within its specified flatness tolerance.

A surface plate must be perfectly level to ensure that height gauges and other vertical measuring instruments provide accurate readings. HK Calibrations specialists suggest using high-precision spirit levels or electronic levels during installation to create a true horizontal datum.

Over time, constant use in specific areas can cause "hollows" or wear spots. HK Calibrations provides professional calibration services to map the surface flatness and can perform precision lapping (resurfacing) to return the plate to its original grade and Australian quality compliance.