PW Optical Coordinate Measuring Machine PW-OCA432

Overview

The PW-OCA432 Optical Coordinate Measuring Machine (CMM) is a high-precision, fully automated vision-based metrology system engineered for non-contact dimensional inspection of precision mechanical components, PCBs, stamped parts, plastic housings, and micro-fabricated assemblies. Unlike tactile CMMs, the PW-OCA432 employs a calibrated optical measurement principle based on pixel-to-real-world coordinate transformation using a high-resolution monochrome or color CMOS sensor, telecentric illumination geometry, and motorized zoom optics. Its four-axis CNC-controlled motion architecture—comprising X, Y, Z linear stages and a motorized zoom/focus axis—enables programmable point-and-shoot, edge detection, geometric feature fitting (lines, circles, arcs, slots), and GD&T evaluation (position, concentricity, parallelism, perpendicularity) in accordance with ISO 1101 and ASME Y14.5 standards. The granite base and column provide thermal stability and vibration damping essential for sub-micron repeatability in production metrology environments.

Key Features

• Fully automated four-axis CNC control (X/Y/Z + motorized zoom/focus) with closed-loop servo positioning for repeatable, operator-independent measurement sequences.
• Granite structural frame ensuring long-term geometric stability, low thermal expansion coefficient (< 2 µm/m·°C), and minimal creep under sustained loading.
• High-resolution industrial camera (≥5 MP effective resolution) with global shutter and low-noise CMOS sensor, optimized for edge contrast and sub-pixel centroid calculation.
• 6.5× motorized zoom lens with auto-focus capability and single-point pixel calibration—eliminating need for repeated calibration across magnification ranges.
• Programmable multi-zone LED illumination system: 5-ring, 8-sector surface lighting plus parallel contour backlighting, each independently controllable with 256-step intensity gradation for optimal feature contrast under varying surface finishes and reflectivity.
• Linear scale feedback with 0.1 µm resolution and traceable calibration certificate compliant with ISO/IEC 17025-accredited reference standards.

Sample Compatibility & Compliance

The PW-OCA432 accommodates parts up to 400 mm × 300 mm × 150 mm (W × D × H) with weight capacity ≤ 15 kg. It supports reflective, translucent, matte, and anodized surfaces without requiring spray coating or fixturing modifications. Measurement data output conforms to industry-standard formats including CSV, DXF, and STEP AP214 for CAD comparison. System software supports audit trail logging, user access levels, and electronic signature workflows aligned with GLP and GMP documentation requirements. While not FDA 21 CFR Part 11–certified out-of-the-box, the platform permits configuration for regulated environments via optional validation packages and IQ/OQ documentation support.

Software & Data Management

The embedded metrology software provides intuitive graphical programming (no-code teach-mode), batch report generation with statistical process control (SPC) charts (X̄–R, Cp/Cpk), and real-time deviation mapping against nominal CAD models. All measurement routines are stored as encrypted .prg files with version history. Raw image capture, coordinate logs, and calibration records are timestamped and archived with SHA-256 checksum integrity verification. Data export supports direct integration with enterprise MES and QMS platforms via OPC UA or RESTful API interfaces. Optional add-ons include GD&T module (per ISO 1101), OCR-based part ID recognition, and AI-assisted defect classification for recurring visual anomalies.

Applications

• Dimensional verification of injection-molded connectors, semiconductor leadframes, and MEMS packaging substrates.
• PCB assembly inspection: solder paste volume estimation, pad coplanarity, fiducial alignment accuracy, and BGA ball diameter/spacing.
• Automotive interior trim component conformity checks—including hole position tolerance, slot symmetry, and embossed logo depth consistency.
• Medical device manufacturing: catheter hub geometry, syringe barrel wall thickness uniformity, and orthodontic bracket slot angle validation.
• Quality gate inspection in high-mix, low-volume job shops where rapid reprogramming between part families is critical.

FAQ

What is the typical measurement uncertainty of the PW-OCA432 at full field of view?
Uncertainty is specified as ±(2.5 + L/200) µm (k = 2), where L is the measured length in mm, per ISO 15530-3 methodology using calibrated step gauges and sphere artifacts.
Does the system support automated focus stacking for height profiling?
Yes—the Z-axis motorization enables programmable focus sweep acquisition; third-party or OEM plugins allow reconstruction of surface topography with vertical resolution down to ±0.5 µm.
Can the software interface with external PLCs for inline production integration?
Standard Ethernet/IP and Modbus TCP protocols are supported; custom driver development kits are available for Siemens S7, Rockwell Logix, and Beckhoff TwinCAT environments.
Is NIST-traceable calibration documentation included with shipment?
A factory calibration report with uncertainty budget and traceability to NMIJ (Japan) or PTB (Germany) reference standards is provided; full ISO/IEC 17025 calibration requires on-site service by authorized metrology labs.
What maintenance schedule is recommended for long-term accuracy retention?
Biannual verification using certified gauge blocks and ring gauges is advised; annual recertification of optical path alignment and scale linearity is recommended for ISO 9001-certified facilities.