How Do High-Precision Granite Machine Bases Enhance CMM Accuracy?

The soul of a CMM lies in its base. A Precision Granite base provides the absolute flatness and geometric stability required to eliminate measurement errors and increase system stiffness.

Eliminating the Root of Geometric Errors

As a CMM operates, the moving bridge causes a shift in the center of gravity. ZHHIMG’s high-rigidity bases resist this micro-deformation, ensuring that Air Bearing Guides glide on a perfectly level plane for reliable, untainted measurement data.

Natural Passive Vibration Damping

External vibrations from the factory floor can ruin sub-micron measurements. Granite’s natural microscopic structure provides excellent self-damping. When paired with our Mineral Casting support structures, it filters out high-frequency noise that disrupts sensitive sensors.

Long-Term Calibration Stability

Metal bases require frequent recalibration due to internal stress release. However, Natural Granite aged for millions of years is stress-free. Once hand-lapped to precision, it maintains its shape for years, reducing maintenance costs and downtime.

Error Source Impact Table

FAQ: CMM Bases

1. Does humidity affect granite? Minimal. Its water absorption is less than 0.02%, causing negligible expansion.

2. How do you verify accuracy? We use laser interferometers in a 20℃±0.5℃ constant temperature environment.

3. Can you produce custom shapes? Yes, we specialize in custom CMM bases based on your structural drawings.

4. Does it require rust prevention? No, granite is naturally corrosion-resistant, unlike cast iron or steel.

5. How are guide surfaces treated? We use Manual Lapping to achieve ultimate flatness and surface finish.

6. Is shipping safe for such heavy items? We use export-grade reinforced crates and multi-layer shock-absorption packaging.