Overview
ISO/TR 230-11:2018 - Test code for machine tools: Part 11 - Measuring instruments suitable for machine tool geometry tests documents the characteristics of precision measuring instruments used to test the geometric accuracy of machine tools under no‑load or quasi‑static conditions. Presented in a list‑style format for easy search and instrument identification, the technical report describes instrument capabilities, calibration considerations and sources of measurement uncertainty to support accurate geometry testing.
Key topics and technical coverage
- Scope and exclusions: Covers instruments for geometry tests (straightness, squareness, flatness, angles, displacements). Does not cover operational testing instruments (vibration - ISO/TR 230‑8, noise - ISO 230‑5), workpiece geometry gauges, or process variables (speeds, feeds, temperature).
- Uncertainty contributors: Environmental, measuring‑equipment, setup/procedure, and software/calculation factors are described to help quantify measurement uncertainty.
- Calibration and traceability: Guidance references calibration practice (ISO 10012) and discusses responsibilities of manufacturers, suppliers and users.
- Instrument descriptions: Detailed listings for mechanical artefacts (reference straightedges, mandrels, reference spheres, surface plates), length/displacement devices (laser interferometers, reference linear scales, contact/non‑contact sensors, probes), and dedicated geometry devices (taut wire, alignment telescope, laser scanners).
- Angle and planar metrology: Coverage of precision levels, electronic inclinometers, autocollimators, angular optics and reference indexing devices.
- Special purpose instruments: Ball bars (telescoping and long range), fibre interferometers, 2D/3D probes, spindle error test equipment and laser tracing systems.
- Supporting material: Informative annexes include workshop checking devices, cross‑references to existing ISO/national standards, support system cautions, and an uncertainty contributor reference table.
Practical applications and users
Who benefits:
- Metrologists and calibration laboratories specifying or validating geometry measurement systems
- Machine tool manufacturers and OEMs defining acceptance and conformity tests
- Quality engineers and production managers implementing machine qualification programs
- R&D teams and third‑party test houses comparing instrument performance and planning measurement campaigns
How it’s used:
- Selecting suitable measuring instruments (e.g., laser interferometer vs. contact probe) for straightness, squareness, flatness and displacement tests
- Defining measurement procedures with documented uncertainty budgets
- Preparing procurement specifications, calibration plans and test protocols for machine tool geometry verification
Related standards (examples)
- ISO TR 230 series (machine tool test codes)
- ISO/TR 230‑8 (vibration testing - operational)
- ISO 230‑5 (noise)
- ISO 10012 (measurement management and calibration)
Keywords: ISO/TR 230-11:2018, machine tool geometry tests, precision measuring instruments, measurement uncertainty, laser interferometer, straightness, squareness, flatness, calibration, ISO.
Open preview (PDF)Test code for machine tools — Part 11: Measuring instruments suitable for machine tool geometry tests
