Accretech Rondcom GRANDE DUO / GRANDE Roundness and Surface Profilometer

Overview

The Accretech Rondcom GRANDE DUO / GRANDE is a high-precision, worktable-rotating roundness and surface profilometer engineered for metrological evaluation of large-scale, heavy-duty industrial components. It operates on the principle of contact stylus profilometry combined with precision rotational metrology—where the part remains stationary on a motorized air-bearing rotary table while a vertically and radially traversing diamond-tipped stylus traces surface topography in multiple axes. This architecture ensures minimal mechanical drift and exceptional repeatability (sub-micron radial deviation over full 360° rotation), making it suitable for form error analysis per ISO 1101, ISO 5436-1, and ANSI/ASME B89.3.1 standards. Designed specifically for sectors requiring traceable geometric integrity—such as wind turbine bearing assemblies, large-diameter machine tool spindles, hydraulic cylinder bores, and aerospace landing gear housings—the system delivers calibrated measurements of roundness, cylindricity, concentricity, straightness, flatness, and surface roughness parameters (Ra, Rz, Rq, Rsk, Rku, etc.) under controlled environmental conditions.

Key Features

• High-stiffness, low-vibration air-bearing rotary table with angular resolution ≤ 0.0001° and radial runout < 30 nm (traceable to NMIJ/JCSS calibration).
• Dual-axis (Z + R) dynamic stylus carriage featuring frictionless linear guides and closed-loop position feedback for consistent tracking force control (0.5–5 mN adjustable).
• GRANDE DUO configuration supports simultaneous dual-sensor operation: one for form measurement (low-speed, high-resolution), another for high-speed roughness profiling—enabling seamless transition between macro-geometry and micro-topography assessment.
• Modular R-axis design allows continuous radial traverse from 5 mm to 1,200 mm diameter range without manual reconfiguration or recalibration.
• Integrated thermal compensation system monitors ambient temperature gradients across the granite base and column to suppress thermal drift during extended measurement cycles (>4 hr).
• Compliance-ready architecture with optional audit trail logging, user access levels, and electronic signature support aligned with FDA 21 CFR Part 11 and ISO/IEC 17025 requirements.

Sample Compatibility & Compliance

The Rondcom GRANDE accommodates parts up to 2,000 kg mass and 1,500 mm height, with standard table diameter of 1,000 mm (expandable to 1,400 mm). Workpiece mounting utilizes T-slot grooves and customizable kinematic fixtures—including V-blocks, collets, and vacuum chucks—to ensure repeatable alignment without distortion. All measurement algorithms conform to ISO 12181-1 (roundness), ISO 12180-1 (cylindricity), ISO 4287 (surface roughness), and ISO 25178-2 (areal surface texture). Calibration certificates are issued per JIS B 7501 and traceable to NMIJ (National Metrology Institute of Japan) reference artifacts. System validation includes daily check routines using certified hemispherical masters and step-height standards.

Software & Data Management

Equipped with Accretech’s proprietary SURFPAK-VX software, the platform provides real-time waveform visualization, automated GD&T reporting, statistical process control (SPC) charting, and multi-part comparative analysis. Data export supports CSV, XML, STEP AP212, and DMIS formats for integration into MES and PLM environments. Optional modules include GD&T module (ASME Y14.5–2018 compliant), surface filtration (Gaussian, Spline, Robust Gaussian), and automated report generation with digital signatures and time-stamped audit logs. All software updates and firmware patches undergo internal verification per IEC 62304 Class B medical device software guidelines—ensuring long-term stability and regulatory defensibility.

Applications

• Evaluation of rolling element bearing raceways in wind turbine gearboxes and main shaft assemblies.
• Form verification of large-diameter hydraulic cylinders, extrusion dies, and injection molding cavities.
• Surface finish validation of hardened steel gears, turbine blades, and precision-ground camshafts.
• Root cause analysis of machining-induced waviness in CNC-turned crankshafts and rotor housings.
• First-article inspection and PPAP submission support for Tier-1 automotive and energy equipment suppliers.
• Research-grade characterization of wear patterns and burnishing effects in tribological testing setups.

FAQ

What is the maximum allowable part weight and height for the GRANDE DUO configuration?

Standard configuration supports parts up to 2,000 kg and 1,500 mm height; custom base extensions and reinforced tables are available upon request.
Does the system support non-contact measurement modes?

No—the Rondcom GRANDE series is exclusively contact-based; non-contact options (e.g., optical interferometry or confocal microscopy) require separate instrumentation.
Can SURFPAK-VX generate ASME Y14.5-compliant GD&T reports?

Yes, the GD&T module enables full tolerance stack-up analysis, datum feature simulation, and composite frame reporting per ASME Y14.5–2018.
Is on-site installation and ISO 17025-compliant validation included?

Installation, leveling, and initial performance verification are standard; full ISO/IEC 17025 accreditation support—including uncertainty budgeting and witness audits—is available as a value-added service.
How often does the air bearing require maintenance?

Under normal operating conditions (cleanroom-class environment, filtered compressed air at 6.5 bar), scheduled maintenance intervals are every 12 months, primarily involving filter replacement and pressure decay testing.