Accretech EM46000-S302 Precision Stylus for Roundness and Cylindricity Measuring Instruments

Overview

The Accretech EM46000-S302 is a high-precision mechanical stylus engineered specifically for use with Accretech (formerly Tokyo Seimitsu) roundness and cylindricity measuring instruments, including the PGI series and RA series benchtop and floor-standing systems. Designed to meet stringent metrological requirements in precision manufacturing environments, this stylus operates on the principle of contact-based tactile probing—translating physical surface deviations into high-fidelity displacement signals via a low-mass, high-stiffness cantilever assembly. Its geometry and material composition are optimized to minimize probe deflection error, thermal drift, and dynamic resonance across rotational speeds up to 10 rpm—ensuring traceable, repeatable form deviation measurements per ISO 1101, ISO 12181 (roundness), and ISO 12180 (cylindricity) standards.

Key Features

• Ultra-low inertia ruby or silicon carbide tip (standard tip diameter: 0.5 mm, optional 0.2 mm or 2.0 mm variants available upon specification)
• Stainless steel stem with integrated strain-gauge or LVDT-based displacement transduction architecture
• Pre-calibrated tip radius and angular orientation to match Accretech’s proprietary kinematic mount interface (EM-series socket compatibility)
• Thermally stable ceramic or Invar-based shank construction for coefficient of thermal expansion (CTE) matching with instrument spindles
• Compliant with IP54 environmental rating when installed in standard Accretech measurement enclosures
• Traceable calibration certificate provided per ISO/IEC 17025-accredited laboratory (NIST-traceable reference artifacts used)

Sample Compatibility & Compliance

The EM46000-S302 stylus supports measurement of metallic, ceramic, and hardened polymer components with surface roughness values ranging from Ra 0.02 µm to Ra 6.3 µm. It is compatible with workpieces having diameters from 1 mm to 500 mm and heights up to 400 mm when used with standard Accretech vertical column configurations. All stylus assemblies conform to JIS B 7504 (Geometrical Product Specifications – Roundness Measurement) and satisfy essential safety and electromagnetic compatibility (EMC) requirements under IEC 61326-1 for industrial measurement equipment. For regulated industries—including aerospace component inspection and medical device manufacturing—the stylus integrates seamlessly into GLP/GMP-compliant workflows when paired with Accretech’s Part 11–enabled software platforms.

Software & Data Management

When deployed with Accretech’s ROUNDPAK or FORMPAK analysis software, the EM46000-S302 enables full digital traceability of stylus identity, usage history, and calibration validity. Each stylus carries a unique serial number registered within the instrument’s firmware, automatically logged during probe initialization. Software enforces mandatory calibration verification prior to measurement sequence execution and maintains audit trails compliant with FDA 21 CFR Part 11 (electronic records and signatures). Raw displacement data is stored in vendor-neutral ASCII or XML formats, supporting third-party statistical process control (SPC) integration via OPC UA or TCP/IP protocols.

Applications

• Verification of bearing raceway roundness and waviness in automotive and industrial bearing production
• Certification of turbine blade root geometry and journal concentricity in aerospace MRO facilities
• In-process inspection of precision-ground hydraulic spools and servo valve bodies
• Validation of injection-molded optical lens mounts requiring sub-micron form tolerance
• Research-grade characterization of ultra-precision turned surfaces in national metrology institutes

FAQ

Is the EM46000-S302 stylus compatible with non-Accretech roundness testers?
No—it is mechanically and electronically designed exclusively for Accretech roundness/cylindricity systems and will not interface with Mitutoyo, Taylor Hobson, or Hommelwerke platforms without custom adapter hardware and firmware modification.
What is the recommended recalibration interval?
Accretech specifies 12 months or 500 operational hours—whichever occurs first—under controlled lab conditions (20 ± 1°C, <50% RH); more frequent calibration is advised for shop-floor deployment.
Can the stylus be used for both roundness and cylindricity measurements?
Yes—its rigid mounting configuration and axial/radial force symmetry allow simultaneous capture of radial deviation (roundness) and axial profile (straightness, taper, and total indicator reading) required for full cylindricity evaluation.
Does the stylus include a protective storage case?
Yes—each unit ships in an ESD-safe, foam-lined aluminum case with humidity indicator and stylus orientation guide engraved on the lid.