ACCRETECH ROUNDCOM Series Precision Roundness & Cylindricity Measuring System

Overview

The ACCRETECH ROUNDCOM Series is a high-precision, shop-floor hardened metrology platform engineered for the deterministic measurement of roundness, cylindricity, concentricity, coaxiality, straightness, flatness, perpendicularity, and profile geometry. Based on the fundamental principle of high-stability rotational metrology—where a precision air-bearing spindle rotates the workpiece or sensor while a calibrated tactile probe traces its surface—the ROUNDCOM system delivers traceable geometric assessments compliant with ISO 1101, ISO 12181 (roundness), ISO 12180 (cylindricity), and ASME Y14.5 standards. Unlike conventional coordinate measuring machines (CMMs) that rely on Cartesian probing, the ROUNDCOM leverages rotational symmetry as an intrinsic reference, enabling sub-micron repeatability (<0.01 µm radial error motion) without dependence on external artifact calibration at each measurement cycle. Its monolithic granite base, integrated air-damped isolation table, and thermally stabilized enclosure ensure long-term stability in non-laboratory environments—making it uniquely suited for quality assurance in aerospace component manufacturing, precision bearing production, turbine shaft verification, and heavy-duty automotive powertrain inspection.

Key Features

• Air-bearing rotary spindle with documented rotation accuracy of ≤0.01 µm (ROUNDCOM 65B) and ≤0.02 µm (ROUNDCOM 60A/45A), certified per ISO 230-7 Annex B procedures.
• Dual-axis auto-positioning sensor bracket—patent-pending design enabling independent XY-plane swivel and YZ-plane tilt—eliminates manual repositioning for internal diameters, shoulders, chamfers, tapers, and reverse-face measurements.
• CNC-driven full-automation workflow: automatic centering, leveling, alignment, and multi-surface scanning (OD, ID, top/bottom faces, conical surfaces) executed within ≤60 seconds per setup.
• Modular offset-type fixture architecture with 80 mm radial offset—optimized to prevent probe interference during deep-bore or high-aspect-ratio cavity measurement.
• Hardened mechanical design rated for continuous operation under industrial floor conditions: IP54-rated electronics housing, vibration-insensitive granite structure, and sealed air-bearing supply lines.
• CE-compliant safety architecture including dual-channel emergency stop circuitry, guarded probe zone interlocks, and force-limited tactile sensing (≤0.05 N nominal contact force).

Sample Compatibility & Compliance

The ROUNDCOM Series accommodates workpieces up to 250 kg mass and 580 mm diameter × 900 mm height (standard configuration), with optional extended-height columns available. It supports direct mounting of large shafts, bearing housings, hydraulic cylinders, gear blanks, and turbine discs via modular V-blocks, collet chucks, and custom kinematic fixtures. All models comply with EU Machinery Directive 2006/42/EC and Electromagnetic Compatibility Directive 2014/30/EU, bearing the CE mark. Measurement uncertainty budgets are validated per ISO/IEC 17025-accredited protocols and support GLP/GMP audit trails when paired with TIMS software’s 21 CFR Part 11-compliant electronic signature module (optional). Calibration certificates include traceability to NMIJ (National Metrology Institute of Japan) and NIST-traceable master artifacts.

Software & Data Management

TIMS (Total Integrated Measurement Suite) serves as the native analytical engine—providing real-time waveform acquisition, FFT-based harmonic decomposition, load curve derivation, amplitude distribution analysis, and slope-restricted sector evaluation (SLOPE mode). The software natively computes all GD&T characteristics defined in ISO 1101 and ASME Y14.5, including composite tolerancing and datum-dependent evaluations. Optional modules extend capability to gear tooth profile analysis (ISO 13126), piston ring contour assessment, and groove masking—enabling automated removal of machining marks or parting lines prior to form evaluation. Data export conforms to ISO 10303-21 (STEP AP210), CSV, and XML formats; report templates are fully customizable using embedded scripting (VBScript-compatible). Audit logs record operator ID, timestamp, calibration status, environmental parameters (temperature/humidity), and raw scan metadata—supporting FDA 21 CFR Part 11 compliance when configured with digital certificate authentication.

Applications

The ROUNDCOM platform is deployed in mission-critical dimensional verification roles across regulated industries: verification of cylindrical bores in aircraft landing gear actuators (AS9100 Rev D); roundness validation of diesel engine crankshafts per SAE J2534; cylindricity assessment of medical implant-grade titanium femoral stems (ISO 14242-1); and profile tolerance verification of semiconductor wafer handling rollers. Its robustness enables integration into automated production cells—where it interfaces via OPC UA or Ethernet/IP with MES systems for SPC-driven process feedback. In R&D laboratories, the system supports advanced research into surface generation mechanisms, wear modeling (via amplitude distribution histograms), and vibro-acoustic correlation studies (through power spectral density mapping of roundness harmonics).

FAQ

What is the minimum resolvable feature size on the ROUNDCOM system?

The effective lateral resolution is governed by probe tip radius (standard 2 µm diamond), sampling density (up to 10,000 points/revolution), and air-bearing motion stability—not by optical diffraction limits. Sub-micron form deviations are resolved with statistical confidence under controlled thermal conditions.
Can the ROUNDCOM measure non-circular profiles such as cam lobes or eccentric shafts?

Yes—TIMS supports polar-to-Cartesian transformation and arbitrary angular segmentation. Profile deviation from theoretical CAD data is evaluated using least-squares best-fit algorithms aligned to user-defined datums.
Is thermal drift compensation included in standard configuration?

Standard hardware includes dual-point temperature monitoring (spindle + granite base) with real-time correction applied to Z-axis encoder readings per ISO 230-3 Annex C methodology.
How is measurement traceability maintained across shifts and operators?

Each measurement session logs environmental metadata, calibration certificate expiry dates, probe wear history, and operator credentials. Optional TIMS Audit Trail module enforces role-based access control and immutable electronic signatures.
Does the system support automated pass/fail decision logic for in-process inspection?

Yes—customizable GO/NO-GO rules can be embedded in measurement routines, with outputs routed to PLCs or SCADA systems via discrete I/O or Modbus TCP.