Granite surface plates are essential tools in precision measurement, widely used in industrial manufacturing and laboratory settings. Made from natural black granite rich in pyroxene, plagioclase, trace olivine, biotite, and magnetite, these plates exhibit exceptional hardness, high strength, thermal stability, and long-term dimensional accuracy. Thanks to their fine-grained structure and natural aging process over billions of years, granite plates offer outstanding durability and precision, even under heavy loads.
To ensure optimal performance, granite surface plates must be securely mounted. Below are three common mounting methods used in industry:
1. Screw Locking Method
This is the most widely used and stable installation method.
Process:
Drill shallow holes (approx. 10mm deep) at the four corners of the granite surface plate.
Insert plastic anchors and align the mounting holes on the support frame.
Secure the plate by screwing upward from below.
Add anti-vibration silicone pads or reinforcement washers for better performance.
Optional: Drill through the crossbeam area and apply adhesive if needed.
Advantages:
Excellent load-bearing capacity
Clean, minimalist appearance
Very stable, even during movement or transport
Reduces vibration and ensures the surface remains level
2. Mortise-and-Tenon (Embedded) Method
Inspired by traditional wood joinery techniques, this method involves inserting the granite plate into a thickened edge support structure.
Process:
Thicken all four edges of the granite plate to allow for embedded installation.
Match the top surface of the frame with the plate's inset.
May require filler materials if there is a large difference in dimensions between the frame and the plate.
Typically used with plastic or wooden frames.
Note:
This method is not recommended for metal frames, especially iron, due to their high rigidity and low shock absorption, which can cause instability or damage during transport.
3. Adhesive Bonding Method
This is a simple and cost-effective method, commonly seen in glass or lightweight tabletop applications.
Process:
Widen the contact area on all four support legs beneath the granite plate.
Apply marble glue (e.g., epoxy or stone adhesive) between the plate and the frame.
For granite surfaces, additional preparation may be needed:
Surface sanding
Adding a backing board (usually wood) for better bonding
Disadvantages:
Lower load-bearing capacity
May not provide sufficient long-term stability for heavy or precision applications
Conclusion
Choosing the right mounting method for a granite surface plate depends on the application environment, load requirements, mobility needs, and the material of the support frame. For heavy-duty, high-precision environments, the screw locking method is recommended. For lighter or aesthetic applications, mortise-and-tenon or adhesive bonding may be suitable.
Proper installation not only ensures measurement accuracy and platform stability but also extends the service life of the granite surface plate.