INDUSTRY COMPONENT

Granite Slab

A granite slab is a precision-ground natural stone component used as a stable reference surface in industrial machinery and measurement systems.

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Component Specifications

Definition
A granite slab is a high-precision component manufactured from natural granite stone, typically used as the foundational table or base in coordinate measuring machines (CMMs), surface plates, optical comparators, and precision assembly equipment. It provides exceptional dimensional stability, vibration damping, and thermal stability due to granite's low coefficient of thermal expansion and natural vibration absorption properties. The surface is precision-ground to achieve flatness tolerances measured in microns, creating an ideal reference plane for measurement and manufacturing operations.
Working Principle
The granite slab functions as a stable, rigid reference plane that maintains geometric accuracy under varying environmental conditions. Its working principle relies on granite's inherent properties: minimal thermal expansion prevents dimensional changes with temperature fluctuations, high compressive strength supports heavy loads without deformation, and natural vibration damping absorbs machine vibrations that could affect measurement accuracy. The precisely ground surface provides a consistent reference for alignment, measurement, and assembly operations.
Materials
Natural granite (typically black or gray varieties like Star Galaxy, Absolute Black, or Impala), with density ranging from 2.6-2.8 g/cm³, compressive strength 150-300 MPa, water absorption <0.5%, and hardness 6-7 on Mohs scale. The material must be free from cracks, voids, and inclusions that could affect stability.
Technical Parameters
  • Density 2600-2800 kg/m³
  • Flatness 0.0005-0.01 mm/m
  • Thickness 100-300 mm
  • Standard Sizes 600×400 mm to 3000×2000 mm
  • Surface Finish Ra 0.2-0.8 μm
  • Compressive Strength 150-300 MPa
  • Maximum Load Capacity 500-5000 kg depending on size
  • Thermal Expansion Coefficient 4-8 × 10⁻⁶/°C
Standards
ISO 8512-2, ISO 8512-3, DIN 876, ASME B89.3.7

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Granite Slab.

granite slab granite surface plate CMM granite table precision granite base measurement granite industrial granite components vibration damping table Granite Slab in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Granite Table/Base

A precision granite platform that serves as the stable reference surface and mounting base for a Coordinate Measuring Machine (CMM).

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Engineering Analysis

Risks & Mitigation
  • Surface contamination affecting measurements
  • Thermal shock from rapid temperature changes
  • Improper handling causing chips or cracks
  • Chemical damage from acidic cleaners
  • Uneven loading causing permanent deformation
FMEA Triads
Trigger: Improper installation without proper leveling
Failure: Loss of flatness accuracy, measurement errors
Mitigation: Use precision levels during installation, follow manufacturer's leveling procedures, install on vibration-isolated foundations
Trigger: Exposure to direct sunlight or heat sources
Failure: Thermal gradients causing warping and measurement drift
Mitigation: Install in temperature-controlled environments, maintain 20±1°C operating temperature, use thermal shields if necessary
Trigger: Impact damage from dropped tools or components
Failure: Surface chips creating measurement reference points
Mitigation: Implement strict tool handling procedures, use protective covers when not in use, establish clear work zone boundaries

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Flatness tolerance per ISO 8512-2 Grade 00 to Grade 2 (0.5-10 μm/m), surface roughness Ra ≤ 0.8 μm
Test Method
Laser interferometry for flatness measurement, surface profilometry for roughness, thermal stability testing per ISO 230-3

Buyer Feedback

★★★★☆ 4.9 / 5.0 (29 reviews)

"The Granite Slab we sourced perfectly fits our Machinery and Equipment Manufacturing production line requirements."

"Found 27+ suppliers for Granite Slab on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Granite Slab is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

Why is granite preferred over steel for precision machine bases?

Granite offers superior dimensional stability with lower thermal expansion (4-8×10⁻⁶/°C vs steel's 11×10⁻⁶/°C), better vibration damping (natural frequency absorption), and doesn't rust or corrode. It maintains accuracy longer without periodic re-calibration.

How often should granite slabs be recalibrated?

Under normal industrial conditions, granite slabs should be calibrated annually. However, in high-precision environments or with frequent heavy use, quarterly calibration is recommended. Environmental factors like temperature fluctuations and humidity changes can affect calibration intervals.

Can granite slabs be repaired if damaged?

Minor surface scratches can often be re-lapped, but chips, cracks, or significant damage usually require replacement. Repair attempts on damaged granite may compromise the structural integrity and flatness specifications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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