Granite Square Box

Granite Square Box

The Ultimate Reference for 3D Perpendicularity&Spatial Accuracy

Product Definition&Core Capability

A Granite Square Box is a precision-machined,cube-shaped metrology artifact crafted from high-grade granite,engineered to establish and verify perfect 90-degree relationships between three mutually perpendicular planes.This fundamental tool provides an absolute spatial reference for calibrating equipment,verifying machine geometry,and ensuring dimensional accuracy in manufacturing and quality control processes.Its monolithic construction and inherent material stability make it the cornerstone of industrial metrology.

Material Excellence&Engineering

Premium Granite Selection

Material Grade:High-density black granite with minimum density of 2.95 g/cm³

Structural Integrity:Each block undergoes ultrasonic testing to ensure absence of flaws or inclusions

Thermal Properties:Naturally low thermal expansion coefficient(5.5-6.5×10⁻⁶/°C)ensures dimensional stability

Geological Consistency:Fine-grained,homogeneous structure provides uniform mechanical properties

Precision Manufacturing Process

Monolithic Construction:Machined from single granite block without joints or adhesives

CNC Diamond Machining:Multi-axis CNC equipment with diamond tooling achieves micron-level accuracy

Progressive Lapping:Multiple-stage lapping process creates optical-grade surface finishes

Stress Relief Protocol:Extended stabilization period eliminates internal stresses before final calibration

Design Features

Optimized Wall Thickness:Calculated thickness-to-size ratio ensures maximum stiffness with minimal weight

Precision Ground Edges:All edges finished with micro-bevels(0.1-0.3mm)to prevent chipping

Handling Provisions:Strategically placed threaded inserts for safe lifting and manipulation

Kinematic Mounting:Three-point support system prevents distortion from mounting surfaces