Overview
The reverse engineering articulated arm is a portable coordinate measuring machine (CMM) designed for capturing precise 3D data of physical objects. Unlike traditional CMMs, its articulated joints allow flexible positioning around complex geometries. These arms typically feature 6-7 rotational axes with integrated encoders for angular measurement. Common applications include automotive prototyping, aerospace component inspection, and heritage artifact digitization. Modern systems integrate with CAD software, enabling direct comparison between scanned data and design specifications. Leading manufacturers include Faro, Hexagon, and Creaform.
Structure and Working Principle
The arm consists of rigid segments connected by high-precision rotary joints, each housing optical encoders that measure angular displacement. When a probe contacts a surface, the system calculates XYZ coordinates through forward kinematics based on joint angles and arm geometry. Two measurement modes exist: contact probing (for hard surfaces) and non-contact laser scanning (for delicate/soft materials). Advanced models incorporate temperature compensation and vibration damping to maintain micron-level accuracy. The base typically contains the electronics and interfaces (USB/Ethernet) for real-time data transfer to metrology software.
Key Features
1. Accuracy: Ranges from ±0.025mm to ±0.1mm depending on model class. Laser scanners may have lower resolution than touch probes. 2. Portability: Weighs 8-15kg, enabling on-site measurements unlike fixed CMMs. 3. Flexibility: Covers 2-4m measurement volumes with 360° joint rotation. 4. Compatibility: Works with PolyWorks, Geomagic, and other mainstream metrology software. Some arms feature wireless operation and augmented reality overlays for guided measurement. Environmental resistance (IP ratings) varies by manufacturer.
Application Areas
Automotive: Reverse engineering legacy parts for digital archives or tooling reproduction. Typical accuracy requirement: ±0.05mm. Aerospace: Verifying airfoil profiles and turbine blade dimensions. Often requires temperature-stable carbon fiber arms. Cultural Heritage: Non-contact scanning of fragile artifacts for preservation and replication. Uses blue light/laser scanners to prevent surface damage. Medical: Custom orthopedic implant design based on patient anatomy scans. Requires FDA-compliant models with traceable calibration.
Maintenance and Precautions
Daily: Clean joints with lint-free cloth; check probe tip wear. Monthly: Verify repeatability using calibration sphere. Annual: Factory recalibration recommended. Avoid sudden impacts that may misalign encoders. Transport in protective case with joint locks engaged. Environmental limits typically 15-25°C for optimal accuracy. Humidity above 80% may affect electronics. Common issues include encoder drift (resolved by recalibration) and USB connection errors (often fixed by driver updates). Always power down before disconnecting cables.
B2B Procurement Guide
Key specifications to evaluate: 1. Volumetric accuracy (per ISO 10360) 2. Maximum permissible error (MPE) for probes/scanners 3. Measurement speed (points/second for scanners) 4. Software bundle (basic vs. advanced packages) Consider total cost of ownership including calibration services ($1,000-$3,000/year). Leasing options exist for short-term projects. For OEMs, look for SDKs to integrate arms into production lines. Used units from certified dealers can offer 30-50% savings but verify remaining service life.
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