Accretech Rondcom 47B Roundness and Cylindricity Measuring Instrument

Overview

The Accretech Rondcom 47B is a high-precision, benchtop roundness and cylindricity measuring instrument engineered for metrological-grade evaluation of rotational symmetry, radial deviation, and form errors in cylindrical and axisymmetric components. Based on the principle of precision rotational scanning—where the workpiece rotates on an ultra-stable air-bearing spindle while a contact stylus traces its surface—the system delivers traceable, repeatable form measurements compliant with ISO 1101 (Geometrical Product Specifications), ISO 12181 (Roundness), and ISO 12180 (Cylindricity). Designed for quality control laboratories, R&D centers, and precision manufacturing facilities handling low-volume, high-value parts—including large-diameter shafts, bearing races, hydraulic cylinders, and optical mounts—the Rondcom 47B features a high-column mechanical architecture optimized for dimensional flexibility without compromising spindle accuracy or thermal stability.

Key Features

• High-column structural design supporting workpieces up to Ø350 mm diameter and 60 kg mass, with optional table extension enabling effective measurement of components requiring extended radial reach.
• Integrated air-bearing main spindle with angular accuracy ≤0.02 arcsec per revolution (traceable to NMI calibration protocols), ensuring minimal motion error during full-circle scanning.
• Multi-axis adjustable sensor arm with full-orientation capability (±90° tilt, 360° rotation) and programmable stylus approach angle—enabling reliable profiling of stepped surfaces, grooves, and discontinuous geometries.
• Real-time overload protection system: automatically halts measurement when stylus force exceeds preset thresholds, preventing damage to diamond-tipped styli (standard 2 µm radius) and LVDT-based displacement sensors.
• Digitally controlled stylus loading (0.5–30 mN range) and insertion depth adjustment—critical for compliant measurement of thin-walled, heat-treated, or low-rigidity components prone to elastic deformation.
• Graphical column-style alignment interface simplifies centering and tilt compensation via intuitive visual feedback, reducing operator dependency and minimizing setup time per part.

Sample Compatibility & Compliance

The Rondcom 47B accommodates a broad spectrum of metallic, ceramic, and polymer-based rotational parts, including but not limited to bearing housings, turbine blades, injection-molded gears, and precision-ground spindles. Its modular fixturing system supports custom chucks, V-blocks, and collet adapters certified to ISO 10360-3 (CMM acceptance testing) and compatible with standard metrology lab environmental conditions (20 ±1 °C, 40–60% RH). All measurement algorithms adhere to ISO/IEC 17025 requirements for test method validation, and raw data output conforms to ANSI/ASME B89.3.4M for roundness instrumentation. The system is fully compatible with external temperature and vibration monitoring for GLP/GMP audit readiness.

Software & Data Management

Equipped with Accretech’s proprietary Rondcom Analysis Suite v5.x, the instrument provides ISO-compliant form analysis (including harmonic decomposition, Zonal evaluation, and Filtered/Unfiltered profiles), automated GD&T reporting (concentricity, circular runout, total runout), and export to industry-standard formats (CSV, XML, PDF, STEP AP219). Audit-trail functionality logs all user actions, parameter changes, and calibration events—supporting compliance with FDA 21 CFR Part 11 for regulated environments. Data integrity is maintained via encrypted local storage and optional network synchronization with enterprise MES/QMS platforms using OPC UA or RESTful API interfaces.

Applications

• Verification of roundness tolerance (Rt, Rp, Rv) in aerospace bushings and landing gear components per AS9100 Rev D.
• Cylindricity assessment of hydraulic piston rods and valve stems under ISO 1101 Annex E.
• Form error mapping of optical lens mounts and laser cavity components where sub-micron radial deviation impacts beam alignment.
• Process capability studies (Cp/Cpk) for grinding and honing operations in automotive powertrain manufacturing.
• Root-cause analysis of out-of-spec parts linked to machine tool wear, chuck distortion, or thermal drift during turning operations.

FAQ

What is the maximum permissible surface roughness for reliable roundness measurement on the Rondcom 47B?
For optimal signal-to-noise ratio and stylus tracking fidelity, Ra values should remain below 3.2 µm; higher roughness may require low-pass filtering or alternative stylus tip geometry.
Can the Rondcom 47B measure non-circular parts such as camshafts or eccentric bushings?
Yes—via multi-revolution synchronous sampling and custom reference waveform alignment, enabling profile deviation analysis against theoretical cam curves or offset centerlines.
Is third-party calibration certification available for ISO/IEC 17025 accreditation?
Accretech-certified calibration services include full uncertainty budgets, traceability to NMI-Japan (AIST), and on-site verification per ISO 10360-3 Annex B.
Does the system support automated batch measurement with barcode-triggered program selection?
Yes—when integrated with optional PLC I/O modules and external barcode scanners, the Rondcom 47B executes preloaded measurement routines based on part ID, logging results directly to SQL databases.
What stylus configurations are supported for measuring narrow grooves or internal bores?
Standard configurations include 120° spherical tips (2 µm radius), skidless miniature probes (Ø0.8 mm shank), and custom cantilevered arms with lateral deflection compensation—available through Accretech’s Application Engineering Group.