Granite surface plates, sourced from deep layers of high-quality rock, are renowned for their exceptional stability, which results from millions of years of natural aging. Unlike materials prone to deformation from temperature fluctuations, granite remains stable under varying conditions. These plates are made from carefully selected granite with a fine crystal structure, offering impressive hardness and a high compressive strength of 2290-3750 kg/cm². They also possess a Mohs hardness rating of 6-7, making them resistant to wear, acids, and alkalis. Moreover, granite is highly corrosion-resistant and does not rust, unlike metal materials.
As a non-metallic material, granite is free from magnetic reactions and does not undergo plastic deformation. It is significantly harder than cast iron, with a hardness 2-3 times greater (comparable to HRC>51). This excellent hardness ensures long-lasting accuracy. Even if the granite surface is subjected to heavy impact, it may only cause minor chipping, unlike metal tools, which may lose precision due to deformation. Thus, granite surface plates offer superior precision and stability compared to those made from cast iron or steel.
Granite Surface Plates and Their Support Stands
Granite surface plates are typically paired with custom-made stands to ensure their optimal performance. The stands are usually welded from square steel and are tailored to match the specifications of the granite plate. Special requests can also be accommodated to meet specific customer requirements. The height of the stand is determined by the thickness of the granite plate, with the working surface typically positioned 800mm above the ground.
Support Stand Design:
The stand has five contact points with the ground. Three of these points are fixed, while the other two are adjustable for coarse leveling. The stand also has five contact points with the granite plate itself. These are adjustable and allow for fine-tuning of the horizontal alignment. It is important to first adjust three of the contact points to create a stable triangular surface, followed by the other two points for precise micro-adjustments.
Conclusion:
Granite surface plates, when paired with a properly designed support stand, offer exceptional precision and stability, making them ideal for high-accuracy measurement tasks. The robust construction and excellent material properties of both the granite plate and its supporting stand ensure long-term performance in various industrial applications.
Post time: Aug-12-2025