Granite Base Plate: Load Capacity ≥500 kg, Flatness ≤0.005 mm/m

Component Specifications

Definition

A precision-machined granite base plate serving as the foundational structural component in optical lens centering machines. Engineered from high-grade granite with exceptional dimensional stability, minimal thermal expansion, and superior vibration damping properties. Provides a geometrically stable reference plane for mounting optical components, ensuring micron-level accuracy during lens alignment and centering operations.

Working Principle

Utilizes granite's inherent properties of high density, low thermal conductivity, and excellent vibration absorption to create a stable reference platform. The rigid, non-metallic structure minimizes thermal distortion and mechanical resonance, maintaining precise alignment of optical elements despite environmental fluctuations and operational vibrations.

Materials

High-precision granite (typically G603 or equivalent), density ≥2.6 g/cm³, water absorption ≤0.2%, compressive strength ≥200 MPa, surface flatness ≤5 μm/m, hardness ≥6 Mohs.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flatness	≤0.005 mm/m
Dimensions	Custom (typically 800x600x150 mm to 1500x1000x200 mm)
Load Capacity	≥500 kg
Natural Frequency	≥200 Hz
Surface Roughness	Ra ≤0.8 μm
Anchor Hole Pattern	M12 or M16 on 100mm grid
Thermal Expansion Coefficient	4-6 × 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, DIN 876, ISO 230-1

Parent Products

This component is used in the following industrial products

Precision Optical Lens Centering Machine

The Precision Optical Lens Centering Machine is a specialized industrial device used in the manufacture of optical instruments and photographic equipment.

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Engineering Analysis

Risks & Mitigation

Thermal shock causing micro-cracks
Impact damage from dropped tools
Moisture absorption if surface sealant fails
Improper mounting causing stress concentration
Chemical contamination affecting surface properties

FMEA Triads

Trigger: Thermal gradient exceeding 2°C/hour
Failure: Micro-crack formation reducing structural integrity
Mitigation: Implement controlled environment with ±0.5°C stability; use thermal insulation during transport

Trigger: Improper anchor bolt torque
Failure: Stress concentration leading to fracture
Mitigation: Use calibrated torque wrenches; follow specified tightening sequence; install stress distribution plates

Trigger: Abrasive contamination during operation
Failure: Surface scratching affecting flatness
Mitigation: Implement clean room protocols; use protective covers when not in use; regular inspection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Flatness: ≤0.005 mm/m, Parallelism: ≤0.01 mm, Surface Roughness: Ra ≤0.8 μm

Test Method

Laser interferometry per ISO 8512-2, Straightedge testing per DIN 876, Thermal stability testing per ISO 230-1

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

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

Manufacturers of Granite Base Plate

Manufacturer profiles associated with Granite Base Plate.

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Frequently Asked Questions

Why use granite instead of steel for precision machine bases?

Granite offers superior vibration damping (3-5 times better than cast iron), minimal thermal expansion (1/3 of steel), and maintains dimensional stability without stress relief aging. It doesn't rust or corrode, and its natural frequency characteristics reduce resonance during high-speed operations.

How is the flatness of granite base plates achieved and maintained?

Through precision grinding and lapping processes using diamond abrasives, followed by laser interferometry verification. The non-porous surface is sealed to prevent moisture absorption, and regular calibration ensures flatness within 5 microns per meter over the operational lifespan.

What maintenance do granite base plates require?

Minimal maintenance: regular cleaning with isopropyl alcohol, protection from direct impact, and annual flatness verification. Avoid thermal shocks and chemical exposure. The non-metallic surface doesn't require rust prevention treatments.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Granite Base Plate