Granite Slab: Thickness 100-300 mm, Density 2600-2800 kg/m³

Q: 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.

Q: 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.

Q: 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.

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 8512-2, ISO 8512-3, DIN 876, ASME B89.3.7

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Granite Slab

Manufacturer profiles associated with Granite Slab.

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Frequently Asked Questions

Why is granite preferred over steel for precision machine bases?