INDUSTRY COMPONENT

Granite Base

Granite base for precision coordinate measuring machines providing ultra-stable reference surface

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Component Specifications

Definition
A precision-engineered granite base serves as the foundational component in industrial coordinate measuring machines (CMMs), providing an exceptionally stable, vibration-dampening, and thermally stable reference surface for accurate dimensional measurements. Its natural granite composition ensures minimal thermal expansion and excellent dimensional stability over time, making it ideal for high-precision metrology applications where measurement repeatability and accuracy are critical.
Working Principle
The granite base operates on principles of dimensional stability, vibration damping, and thermal inertia. Its dense crystalline structure absorbs vibrations from the environment and machine operations, while its low coefficient of thermal expansion minimizes dimensional changes with temperature fluctuations. The precisely lapped surface provides a geometrically stable reference plane against which all measurements are calibrated, ensuring measurement integrity throughout the operating range.
Materials
Natural granite (typically black or gray granite with fine grain structure), Grade: Metrology-grade granite with specific density (>2.6 g/cm³) and hardness (Mohs 6-7), Surface finish: Lapped to ≤0.001 mm flatness, Treatment: Sealed with epoxy or polymer coating for moisture resistance
Technical Parameters
  • Hardness Mohs 6-7
  • Standard sizes 500×500 mm to 2000×3000 mm
  • Weight capacity Up to 5000 kg
  • Damping capacity High (natural vibration damping)
  • Surface roughness Ra ≤ 0.2 μm
  • Flatness tolerance ≤0.001 mm/m
  • Thermal expansion coefficient 5-8 × 10⁻⁶/°C
Standards
ISO 10360, ISO 230, DIN 876, ASME B89

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Granite Base.

granite base CMM granite base precision granite surface coordinate measuring machine base metrology granite vibration damping base thermal stable reference surface industrial measurement equipment Granite Base in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Precision Industrial Coordinate Measuring Machine

Standalone metrology machine for dimensional inspection of industrial components

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Engineering Analysis

Risks & Mitigation
  • Surface contamination affecting measurements
  • Thermal shock from rapid temperature changes
  • Impact damage from dropped tools or components
  • Moisture absorption if improperly sealed
  • Structural cracking from improper handling
FMEA Triads
Trigger: Improper handling during installation
Failure: Structural cracking or chipping
Mitigation: Use specialized lifting equipment, follow manufacturer handling guidelines, install on vibration-isolated foundation
Trigger: Exposure to rapid temperature changes
Failure: Thermal stress leading to dimensional instability
Mitigation: Maintain stable environment (±1°C), implement gradual temperature transitions, use thermal insulation when necessary
Trigger: Chemical contamination from cleaning agents
Failure: Surface degradation and measurement inaccuracies
Mitigation: Use only approved granite cleaners, implement regular cleaning protocols, train operators on proper maintenance

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Flatness: ≤0.001 mm/m, Parallelism: ≤0.002 mm, Surface finish: Ra ≤ 0.2 μm
Test Method
Laser interferometry, Electronic levels, Precision straightedges, Surface plate calibration per ISO 8512

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

Why is granite preferred over steel for precision machine bases?

Granite offers superior dimensional stability, better vibration damping, and lower thermal expansion compared to steel, making it ideal for precision measurement applications where environmental factors can affect accuracy.

How often does a granite base need calibration?

Granite bases typically require annual calibration under normal operating conditions, but frequency may increase with heavy usage or in environments with significant temperature fluctuations.

Can granite bases be repaired if damaged?

Minor surface damage can often be repaired through re-lapping, but significant structural damage usually requires replacement as granite's crystalline structure cannot be welded or fused effectively.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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