Accretech RONCOM 41C Roundness and Cylindricity Measuring Instrument

Overview

The Accretech RONCOM 41C is a high-precision roundness and cylindricity measuring instrument engineered for metrology laboratories, precision manufacturing QA/QC departments, and R&D facilities requiring traceable geometric form evaluation. It operates on the principle of radial deviation measurement using a high-stability air-bearing rotary spindle (θ-axis) and a vertically traversing column (Z-axis), enabling full 360° angular sampling of cylindrical, disk-shaped, or annular components. The system conforms to ISO 4291 and JIS B7451 standards for roundness measurement uncertainty, with spindle accuracy specified as (0.04 + 6H/10000) µm — where H denotes the height above the reference plane in millimeters. Its rigid granite base, hydrostatic air bearing spindle, and thermally stabilized Z-column ensure minimal thermal drift and mechanical hysteresis, supporting repeatable sub-micron form analysis under controlled environmental conditions (20 ± 1 °C, <50% RH recommended).

Key Features

• High-accuracy air-bearing main spindle with ≤0.04 µm base error (per ISO 4291), optimized for low vibration and long-term rotational stability.
• Dual-axis motion control: Z-axis travel of 200 mm with programmable feed rates from 0.6 to 6 mm/s (measurement) and up to 15 mm/s (rapid positioning); R-axis radial traverse of 125 mm at 5 mm/s.
• Integrated ACCTee software platform — a unified interface for setup, real-time waveform visualization, automated centering/tilt alignment, and post-measurement spectral analysis.
• Comprehensive form evaluation suite: supports MZC (Minimum Zone Center), LSC (Least Squares Center), MIC (Maximum Inscribed Circle), MCC (Minimum Circumscribed Circle), and N.C. (No Correction) algorithms per ISO 1101 and ASME Y14.5.
• Digital filtering with selectable 2RC and Gaussian characteristics; rotary cutoffs from 15 to 500 cycles/revolution; axial cutoffs from 0.025 mm to 8 mm.
• Stylus system featuring a Ø1.6 mm tungsten carbide sphere with nominal measuring force of 70 mN, ensuring surface integrity preservation on soft metals, ceramics, and hardened steels.
• Automated alignment functions including centering (±2 mm adjustment range) and tilt compensation (±10 arcmin), reducing operator dependency and setup time.

Sample Compatibility & Compliance

The RONCOM 41C accommodates workpieces up to Ø250 mm in diameter and 520 mm in external height (or 300 mm internal height), with maximum load capacity of 25 kg on its Ø148 mm precision ground granite table. It supports both external and internal geometry measurement — including bores, flanges, bearing races, and optical lens mounts — via interchangeable stylus holders and extension probes. All measurement routines adhere to ISO 12181 (roundness), ISO 12180 (cylindricity), ISO 1101 (geometrical tolerancing), and JIS B 0621 (surface roughness terminology). The system architecture enables full audit trail generation, user access logging, and electronic signature support — essential for GLP, GMP, and FDA 21 CFR Part 11-compliant environments when deployed with validated ACCTee configuration.

Software & Data Management

ACCTee serves as the embedded operating and analysis environment, delivering synchronized acquisition across θ-, Z-, and R-axes with real-time waveform overlay and deviation mapping. It provides expanded Fourier spectrum analysis, power spectral density (PSD) plots, harmonic decomposition (up to 50th order), and design-to-part comparison against CAD-derived nominal profiles. Measurement reports are exportable in PDF, CSV, and XML formats, with configurable templates compliant with internal QA documentation standards. Data storage follows hierarchical project-based organization, with version-controlled parameter sets and automatic timestamping. Optional network integration allows remote monitoring and centralized database archiving via Ethernet TCP/IP — facilitating multi-station metrology coordination in large-scale production facilities.

Applications

This instrument is routinely deployed for verifying critical form tolerances in aerospace turbine components (e.g., shaft journals, compressor discs), automotive transmission gears and CV joint housings, medical implant substrates (acetabular cups, femoral stems), and semiconductor wafer handling chucks. It supports advanced analyses such as harmonic distortion profiling for identifying machine tool errors (e.g., spindle runout, guideway misalignment), thermal growth characterization during process validation, and statistical process control (SPC) data extraction for Cp/Cpk calculation. Its capability to evaluate coaxiality, parallelism, and perpendicularity — alongside roundness and cylindricity — makes it indispensable for first-article inspection and PPAP submissions in Tier-1 supplier workflows.

FAQ

What standards does the RONCOM 41C comply with for roundness calibration?
It meets ISO 4291 and JIS B7451 for spindle accuracy verification, and measurement results are traceable to national metrology institutes via optional calibration kits and certified artifacts.
Can the system perform both roundness and cylindricity measurements in a single setup?
Yes — continuous Z-axis scanning synchronized with high-resolution angular sampling enables full 3D form reconstruction required for cylindricity per ISO 12180-1.
Is ACCTee software compatible with Windows 10/11 and enterprise domain authentication?
ACCTee runs on a dedicated industrial PC with Windows Embedded OS; domain integration requires IT-administered Group Policy configuration and is supported in v4.2+ releases.
What maintenance intervals are recommended for the air bearing spindle?
Daily compressed air filtration check; quarterly inspection of air supply pressure (0.35–0.7 MPa) and dew point (<5 °C); annual recalibration by authorized Accretech service engineers.
Does the system support custom filter definitions beyond standard 2RC and Gaussian options?
No — only pre-certified digital filters compliant with ISO 1101 Annex B are implemented to ensure measurement validity and inter-laboratory comparability.