Coordinate Measuring Machines (CMM) require extremely stable structures to achieve high measurement accuracy.
Even small thermal deformation or vibration can affect measurement repeatability.
Precision granite has become one of the most important materials used in CMM systems and metrology equipment.
What Is a CMM Granite Base?
A CMM granite base is a precision structural platform used to support coordinate measuring systems.
Granite provides:
- Dimensional stability
- High flatness
- Vibration absorption
- Corrosion resistance
These properties help maintain long-term measurement accuracy.
Why Thermal Stability Matters in Metrology
Measurement systems are highly sensitive to thermal changes.
Granite has a low thermal expansion coefficient:
4.6×10⁻⁶/°C
This helps reduce dimensional variation during measurement operations.
Granite Flatness Standards
Precision granite used in metrology systems typically follows strict flatness standards.
|
Grade |
Application |
|
Grade 00 |
Ultra precision metrology |
|
Grade 0 |
Precision inspection |
|
Grade 1 |
General industrial measurement |
Granite vs Steel for CMM Structures
| Property | Granite | Steel |
|---|---|
| Thermal Stability | Excellent | Medium |
| Vibration Damping | High | Medium |
| Corrosion Resistance | Excellent | Poor |
| Long-Term Stability | Excellent | Medium |
Granite provides better long-term dimensional stability for precision metrology applications.
Applications of Precision Granite in Metrology
Precision granite structures are widely used in:
- Coordinate Measuring Machines
- Optical metrology systems
- Precision inspection equipment
- Surface measurement systems
- Calibration platforms
Why Choose UNPARALLELED®
UNPARALLELED® manufactures precision granite structures for metrology and inspection industries.
Our capabilities include:
- High precision grinding
- Large granite machining
- Precision lapping
- Ultra precision assembly
- Customized metrology structures
FAQ
Why is granite used in CMM machines?
Granite provides dimensional stability, thermal stability, and vibration damping for accurate measurement.
What granite grade is used in CMM systems?
Grade 00 granite is commonly used for ultra precision metrology applications.
Can granite improve measurement repeatability?
Yes. Granite reduces thermal deformation and vibration, improving measurement consistency.