Accretech Rondcom 65A-LH Large-Diameter Roundness and Cylindricity Measuring Instrument
| Brand | Accretech |
|---|---|
| Origin | Japan |
| Model | Rondcom 65A-LH |
| Maximum Workpiece Weight | 250 kg |
| Maximum Measurable Diameter | Φ580 mm |
| Maximum Measurable Height | 900 mm (Standard Configuration) |
| Type | Imported High-Precision Rotational Metrology System |
| Compliance | Designed for ISO 1101, ISO 5436-1, and ASME Y14.5 geometric tolerance evaluation |
Overview
The Accretech Rondcom 65A-LH is a high-precision rotational metrology system engineered for the comprehensive evaluation of roundness, cylindricity, concentricity, runout, straightness, and profile deviations in large-diameter, heavy-duty components. Based on Accretech’s proven R65A platform—renowned globally for sub-micron angular stability and radial error motion control—the 65A-LH extends this heritage to accommodate significantly larger workpieces without compromising metrological integrity. Its core measurement principle relies on precision air-bearing rotary table rotation combined with a vertically traversing, high-resolution linear displacement sensor (LVDT or capacitive probe), synchronized via a high-stability encoder system referenced to a master datum spindle. All mechanical axes are thermally stabilized and mounted on a massive granite base to minimize environmental drift and vibration coupling. The instrument operates under controlled laboratory conditions (20 ± 0.5 °C, humidity <60 % RH), meeting the environmental requirements specified in ISO 10360-7 for coordinate measuring machines and roundness testers.
Key Features
- Massive granite base and structural frame engineered for long-term dimensional stability and minimal thermal deformation.
- Air-bearing rotary table with ≤0.02 µm radial error motion (TIR) at 100 mm radius, traceable to NMIJ/JNLA calibration standards.
- Vertical column with ±0.5 µm linear positioning repeatability over full 900 mm travel, equipped with dual-axis tilt compensation.
- Modular probe interface supporting contact stylus (diamond tip, 2 µm radius, 12° included angle), non-contact capacitive sensors, and optional scanning modules for surface texture overlay.
- Integrated temperature and air pressure monitoring with real-time environmental compensation algorithms compliant with ISO 230-3.
- Full-axis motorized positioning with programmable speed profiles and multi-point auto-centering routines.
Sample Compatibility & Compliance
The Rondcom 65A-LH accommodates workpieces up to 250 kg and Φ580 mm diameter, making it suitable for turbine shafts, large bearing races, hydraulic cylinder bores, gear blanks, and precision machine tool spindles. Fixturing options include adjustable V-blocks, custom collet chucks, and vacuum chucks compatible with ferrous and non-ferrous materials. Measurement data conforms to ISO 1101 (Geometrical product specifications — Geometrical tolerancing), ISO 5436-1 (Geometrical features — Measurement standards — Part 1: Vocabulary), and ASME Y14.5–2018 (Dimensioning and tolerancing). Calibration certificates are issued per ISO/IEC 17025 by accredited laboratories; traceability to NMIJ (National Metrology Institute of Japan) is maintained through annual intercomparison cycles.
Software & Data Management
The system runs on Accretech’s proprietary Rondcom Analysis Suite v5.x, a Windows-based application supporting full GD&T evaluation per ISO 14405 and ASME Y14.5. It provides automated report generation with customizable templates, statistical process control (SPC) charting, and deviation color-mapping on polar and Cartesian plots. Raw data export is supported in ASCII, CSV, and XML formats; binary measurement files (.rmd) retain full metadata including environmental logs, probe calibration history, and operator ID. The software architecture supports FDA 21 CFR Part 11 compliance when deployed with validated user access controls, electronic signatures, and audit trail logging—fully aligned with GLP/GMP quality systems for regulated manufacturing environments.
Applications
- Verification of cylindrical geometry in aerospace engine shafts and landing gear components.
- Final inspection of high-precision bearing rings prior to assembly in wind turbine gearboxes.
- Process validation for honing and grinding operations on large-diameter hydraulic cylinders.
- Root-cause analysis of form errors in CNC-machined mold cavities used in injection molding.
- Calibration reference for shop-floor roundness gauges and coordinate measuring machines.
- Research-grade characterization of ultra-precision turned surfaces in national metrology institutes.
FAQ
What is the maximum permissible weight for off-center loading on the rotary table?
The table is rated for 250 kg at center loading; off-center loads must not exceed 150 kg with moment arm ≤150 mm to maintain angular stability and encoder fidelity.
Does the system support automated multi-layer scanning for cylindricity evaluation?
Yes—vertical axis synchronization enables programmable axial step-and-hold acquisition across up to 128 equally spaced sections within the 900 mm height range.
Is third-party software integration possible (e.g., MATLAB or Python)?
The Rondcom Analysis Suite exposes a documented COM API and supports OPC UA server mode for bidirectional data exchange with external analytics platforms.
How frequently does the system require recalibration?
Annual full-system calibration is recommended; daily verification using certified reference artifacts (e.g., hemispherical masters, step gauges) is required per ISO 10360-7 Annex B.
Can the instrument be relocated to another facility?
Relocation requires re-leveling, granite base re-grouting, full kinematic alignment, and NMIJ-traceable recalibration—typically completed by Accretech-certified field engineers.
