Overview
ISO 13041-5:2015 - “Test conditions for numerically controlled turning machines and turning centres - Part 5: Accuracy of speeds and interpolations” defines kinematic test methods to evaluate the accuracy of spindle speeds, feed (axis) speeds, and the accuracy of interpolated paths on NC (CNC) turning machines and turning centres. It applies to machines with horizontal, vertical, and inverted vertical workholding spindles and cross‑references ISO 230‑1 and ISO 230‑4 for installation, measurement methods, and circular interpolation testing.
Key topics and requirements
- Scope of tests: Tests target spindle rotational accuracy, individual linear axis feed accuracy, and multi‑axis interpolation (paths described by simultaneous motion of two or more linear and/or rotary axes).
- Machine types covered: NC turning machines and turning centres with horizontal, vertical, and inverted vertical spindles.
- Reference standards: Normative links to ISO 230‑1 (geometric accuracy and installation/warm‑up procedures) and ISO 230‑4 (circular tests for NC machine tools).
- Test structure: Normative annexes provide kinematic tests by spindle orientation:
- Annex A - horizontal spindle machines
- Annex B - vertical spindle machines
- Annex C - inverted vertical spindle machines
- Annex D - informative precautions for specific tests
- Measurement and instruments: Guidance on acceptable measuring instruments and presentation of results (graphical formats recommended for some tests). Instruments with equivalent uncertainty and resolution may be used.
- Software compensation: Use of built‑in compensation features must be agreed between manufacturer and user and declared in test reports; compensation affects test setup (axes not locked).
- Flexibility: Tests can be selected based on acceptance, maintenance, or benchmarking needs; the sequence of tests is not fixed.
Applications and who uses it
ISO 13041-5 is essential for:
- Machine tool manufacturers - for factory acceptance testing and product validation.
- Quality/inspection labs - to verify spindle and axis performance and interpolation accuracy.
- OEMs and integrators - to qualify machines before integration into production lines or flexible manufacturing systems (FMS).
- Purchasing and maintenance teams - for contract acceptance, preventive maintenance checks, and troubleshooting contouring or speed accuracy issues.
- Metrology and R&D groups - for benchmarking, performance improvement, and verifying compensation strategies.
Practical uses include acceptance testing, performance comparison, maintenance planning, and certification of turning centres for general‑purpose and normal accuracy applications.
Related standards
- ISO 230‑1 - Test code for machine tools: geometric accuracy (installation, warm‑up, measurement methods)
- ISO 230‑4 - Test code for machine tools: circular tests for NC machine tools
- ISO 841 and other ISO 13041 parts (Parts 1–4, 6–8) for geometric, positional, contouring, and thermal test conditions
Keywords: ISO 13041-5, turning machines, turning centres, accuracy of speeds, interpolations, NC turning machines, spindle speed accuracy, feed speed tests, kinematic tests.
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