1. The Foundation of Metrology: The Reference Plane
A CMM relies on a perfectly flat X-Y-Z axis. Our granite surface plates serve as the absolute reference. Because granite is a natural material that has "aged" over millions of years, it is internally stable, ensuring the machine stays calibrated longer than those using aluminum or steel frames.
2. Supporting Heavy Loads with Zero Deflection
Industrial CMMs often measure heavy engine blocks or aerospace parts. The high compressive strength of our black granite (Zhonghui Group standards) ensures that even under multi-ton loads, the base exhibits minimal deflection, preserving the integrity of the measurement data.
3. Integration with Air Bearing Technology
Most high-end CMMs use air bearings for frictionless movement. Granite can be lapped to a mirror-like smoothness, allowing air bearings to glide on a film of air only a few microns thick. This synergy between granite and air bearings is what allows for sub-micron repeatability.
CMM Base Requirements
| Requirement | Advantage of Granite |
| Flatness | Easily lapped to < 2μm |
| Static Load | No permanent deformation |
| Surface Finish | Ideal for air bearing glide |
FAQ: Key Questions Answered
Why is black granite preferred over grey? Black granite generally has a higher density and lower water absorption.
Can you add inserts to the base? Yes, we install stainless steel threaded inserts for mounting components.
How do you ship large granite bases? We use custom export-standard wooden crates with shock-absorption for global shipping.
Do you provide calibration certificates? Every base comes with a factory inspection report traceable to national standards.
What is the maximum length you can produce? We can produce single pieces up to 12 meters in length.
Can you refurbish old CMM bases? Yes, we offer on-site or factory re-lapping services to restore accuracy.