Unmatched Dimensional Stability and Accuracy
The foundation of any reliable measurement process starts with a perfectly flat reference plane. Our granite surface plates are manufactured from high-quality natural black granite, which possesses exceptional structural stability. This ensures that the plate maintains its flatness over decades of use, providing a consistent baseline for your most critical inspection tasks.
Superior Wear and Corrosion Resistance
Unlike metal alternatives, granite is naturally non-magnetic and highly resistant to corrosion from coolants or oils often found in workshops. The dense structure of our granite offers incredible wear resistance, meaning that even with frequent sliding of heavy parts, the surface integrity remains intact. This durability significantly reduces the frequency of recalibration.
Optimal Thermal Properties for Precision
Temperature fluctuations are the enemy of precision measurement. Granite has a low coefficient of thermal expansion, meaning it does not expand or contract significantly with minor temperature changes. This thermal stability is crucial for maintaining micron-level accuracy in environments where climate control might not be perfect.
Comparison: Granite vs. Cast Iron Surface Plates
| Feature | High Precision Granite | Cast Iron |
|---|---|---|
| Corrosion Resistance | Excellent (Rust-proof) | Poor (Requires oiling) |
| Thermal Stability | High (Low expansion) | Low (Sensitive to heat) |
| Maintenance | Low (Easy to clean) | High (Deburring needed) |
| Accuracy Retention | Long-term stability | Prone to warping |
FAQ: Granite Surface Plates
What grade of accuracy do your surface plates meet?
Our plates are available in various grades (DIN 876, ASME, etc.) and can achieve accuracies better than 1 μm depending on the size and specification required.
Can you customize the size of the granite surface plate?
Yes, we offer fully customized dimensions to fit your specific laboratory or workshop requirements, including special thicknesses.
How do I maintain a granite surface plate?
Maintenance is simple; keep it clean and covered when not in use. Unlike cast iron, it does not rust, and minor surface marks can often be polished out.
Is granite better than ceramic for surface plates?
Granite offers a better balance of cost, weight, and durability for general metrology. Ceramic is used for specific ultra-light or ultra-precision air-bearing applications.
Do you provide calibration certificates?
Yes, every high precision granite surface plate ships with a full inspection report and calibration certificate traceable to international standards.
What is the lead time for a standard surface plate?
Standard sizes are often in stock, but custom orders typically take 10-15 workdays depending on the complexity and current production load.