Accretech RONCOM 31C Roundness and Cylindricity Measuring Instrument
| Brand | Accretech (Tokyo Seimitsu) |
|---|---|
| Origin | Japan |
| Model | RONCOM 31C |
| Measurement Range (Max. Diameter) | Ø250 mm |
| Z-Axis Vertical Travel | 200 mm |
| R-Axis Radial Travel | 125 mm |
| Spindle Rotational Accuracy | (0.04 + 6H/10000) µm per ISO 4291 / JIS B7451 |
| Minimum Zone Circularity Deviation | (0.02 + 3H/10000) µm |
| Z-Axis Straightness | 0.50 mm / 100 mm |
| Sensor Linear Range | ±400 µm |
| Stylus Tip | Ø1.6 mm sintered carbide sphere |
| Measuring Force | 70 mN |
| Rotation Speed (θ-axis) | 6 rpm |
| Z-Axis Feed Speed (Measuring) | 0.6–5 mm/s |
| Air Supply Requirement | 0.35–0.7 MPa |
| Power Supply | AC 100 V, 50/60 Hz |
| Weight | 120 kg |
| Dimensions (W×D×H) | 1800 × 1000 × 1700 mm (with optional system stand) |
Overview
The Accretech RONCOM 31C is a high-precision roundness and cylindricity measuring instrument engineered for metrology laboratories, quality control departments, and precision manufacturing facilities requiring traceable geometric form evaluation in accordance with international standards including ISO 4291, JIS B7451, and ASME Y14.5. It operates on the principle of high-resolution rotational scanning, where a precision air-bearing spindle rotates the workpiece while a calibrated linear displacement sensor—equipped with a Ø1.6 mm sintered carbide stylus—traces radial deviations in the θ–R plane. Simultaneously, vertical (Z-axis) motion enables full cylindrical surface characterization, supporting comprehensive analysis of roundness, cylindricity, concentricity, coaxiality, parallelism, perpendicularity, and straightness. The instrument’s mechanical architecture integrates a rigid granite base, hydrostatic air bearing spindle, and thermally stable Z-column to minimize Abbe error and thermal drift, ensuring long-term measurement stability and repeatability under controlled environmental conditions (20 ± 1 °C, <50% RH recommended).
Key Features
- High-accuracy hydrostatic air bearing spindle with rotational error specification of (0.04 + 6H/10000) µm per ISO 4291, enabling sub-micron roundness evaluation over full measurement height.
- Dual-axis servo-controlled motion system: Z-axis travel of 200 mm and R-axis radial travel of 125 mm, supporting measurement of components up to Ø250 mm diameter and 520 mm external height (with optional fixtures).
- Integrated ACCTee measurement software platform—Accretech’s next-generation metrology interface—providing intuitive workflow management, real-time deviation visualization, and automated alignment routines.
- Comprehensive geometric evaluation suite: supports MZC (Minimum Zone Center), LSC (Least Squares Center), MIC (Maximum Inscribed Circle), MCC (Minimum Circumscribed Circle), and N.C. (No Correction) centering algorithms for robust uncertainty-aware form assessment.
- Digital filtering compliant with ISO 11562 and ISO 12085: selectable Gaussian or 2RC filters with cutoff frequencies ranging from 15 to 500 undulations per revolution (UPR) for rotationally symmetric features, and 0.025–8 mm for axial profiles.
- Full-featured semi-automatic operation: includes auto-centering, auto-leveling, stylus approach/retract logic, and programmable stop limits (±5 mm) on both Z and R axes to protect probe and part integrity.
Sample Compatibility & Compliance
The RONCOM 31C accommodates a broad range of rotationally symmetric parts—including bearing races, shafts, pistons, nozzles, and optical mounts—with maximum loading capacity of 25 kg on its Ø148 mm precision ground granite table. Centering adjustment range is ±2 mm; tilt compensation is supported within ±10 arcminutes. All measurement data and instrument configuration logs are timestamped and stored with full audit trail capability—fully compatible with GLP/GMP documentation requirements. The system meets electromagnetic compatibility (EMC) directives per IEC 61326-1 and safety standards per IEC 61010-1. While not FDA 21 CFR Part 11–certified out-of-the-box, ACCTee software supports user-defined electronic signature protocols and configurable data export formats (CSV, DXF, PDF) for integration into validated QA/QC workflows.
Software & Data Management
ACCTee software provides native support for multi-parameter geometric analysis, spectral decomposition (power spectrum, Fourier amplitude/phase plots), and deviation mapping in both expanded polar and 3D surface views. Measurement reports include full traceability metadata: operator ID, calibration certificate reference, environmental readings (optional via external sensors), and filter configuration. Data export supports CSV for statistical process control (SPC) integration, DXF for CAD-based tolerance stack-up analysis, and encrypted PDF for archival compliance. Optional modules enable design-to-part comparison using imported STEP or IGES nominal geometry, with color-coded deviation overlays scaled to user-defined tolerances. All raw point-cloud datasets are retained in proprietary binary format with lossless precision and can be reprocessed retrospectively with updated filter settings or evaluation criteria.
Applications
This instrument serves critical metrology functions across aerospace (turbine blade root roundness verification), automotive (crankshaft journal cylindricity certification), medical device manufacturing (implant-grade femoral stem geometry validation), and precision optics (lens cell concentricity control). Its ability to quantify harmonic content via Fourier analysis makes it particularly valuable for diagnosing machine tool errors—such as spindle runout, slide misalignment, or chuck distortion—during production process qualification. In R&D environments, the RONCOM 31C supports iterative design validation by correlating measured form errors with finite element predictions of thermal or mechanical deformation.
FAQ
What standards does the RONCOM 31C comply with for roundness measurement accuracy?
It conforms to ISO 4291 and JIS B7451 for spindle rotational error specification and supports evaluation methods aligned with ISO 1101 (Geometrical Product Specifications) and ISO 12181 (Roundness).
Can the system perform cylindricity measurements on internal bores?
Yes—using optional retractable or miniature stylus holders, the RONCOM 31C measures internal diameters up to Ø300 mm (model-dependent); standard configuration supports Ø200 mm internal bore evaluation.
Is air supply conditioning required for optimal performance?
Yes—a clean, dry, oil-free compressed air source with pressure regulation (0.35–0.7 MPa) and particulate filtration ≤5 µm is mandatory to maintain air bearing integrity and prevent sensor contamination.
Does ACCTee software support automated report generation with company branding?
Yes—customizable report templates allow insertion of corporate logos, header/footer text, and standardized pass/fail criteria; outputs are fully scriptable via COM interface for enterprise MES integration.
What is the recommended environmental class for installation?
Class 2 per ISO 230-2 (temperature stability ±1 °C/hour, ±0.5 °C/day, vibration isolation per ISO 25383 Class B) is required to achieve stated accuracy specifications.
