ISO 10791-4-1998 PDF

Full title and description

ISO 10791-4:1998 — Test conditions for machining centres — Part 4: Accuracy and repeatability of positioning of linear and rotary axes. This part of ISO 10791 defines test conditions, tolerances, measurement guidance and reporting formats for evaluating the positioning accuracy and repeatability of linear and rotary axes on CNC machining centres.

Abstract

This standard specifies the tolerances and test procedures to assess the positioning accuracy and repeatability of linear axes (up to 2 000 mm travel) and rotary axes of machining centres. It references ISO 230-2 for environment, warm-up and general measurement-method requirements and provides acceptance criteria, measurement banding by travel length, formats for presenting results and minimum reporting information to ensure traceability and comparability of test outcomes.

General information

• Status: Published (International Standard, confirmed)
• Publication date: 1998-07 (Edition 1, 1998)
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 25.040.10 — Machining centres
• Edition / version: Edition 1 (1998)
• Number of pages: 7

Scope

ISO 10791-4:1998 applies to CNC machining centres and specifies test conditions and acceptance tolerances for positioning and repeatability of linear axes with travel up to 2 000 mm and for rotary axes (full 360° checks). It is intended for acceptance testing, comparative evaluation, maintenance verification and quality control. Environmental conditions, machine warm-up and primary measurement-method requirements are covered by ISO 230-2 and are referenced rather than re-stated in this part.

Key topics and requirements

• Defined positioning and repeatability quantities (bidirectional/unidirectional accuracy, repeatability, reversal values and systematic deviations).
• Tolerance bands for linear axes by travel length (example bands for <500 mm, 500–800 mm, 800–1250 mm, 1250–2000 mm) and angular tolerances expressed in arc seconds for rotary axes.
• Measurement-method guidance and recommended measuring equipment (laser interferometer and equivalent high‑accuracy systems for linear checks; angle interferometers, autocollimators or equivalent for rotary checks).
• Procedures for test execution, recommended axis positions when other axes are not under test, and guidance to minimise deflection and thermal effects.
• Statistical presentation of results, graphical deviation plots and standardised result tables/templates for reporting.
• Minimum mandatory reporting elements for traceability: machine identification, test identification (date, inspector), instrument identification and calibration, test conditions (temperatures, axis positions, feed rates) and numerical/graphical results.

Typical use and users

Used by machine tool manufacturers, OEM test laboratories, independent inspection and calibration laboratories, factory acceptance/quality teams, procurement engineers and maintenance departments. Typical applications include acceptance testing of new machining centres, comparative performance assessments, scheduled verification after maintenance or retrofit, and benchmarking for purchase specifications.

Related standards

ISO 10791 is a multi‑part series; closely related documents include other parts of ISO 10791 (geometric tests, work‑holding pallet tests, contouring performance, finished test piece evaluation and speed/interpolation checks) and the ISO 230 series — notably ISO 230-2 (test code for machine tools — environmental and measuring‑method requirements) which is referenced for warm-up, environment and measurement-method fundamentals.

Keywords

machining centres, positioning accuracy, repeatability, linear axis, rotary axis, CNC, test conditions, tolerances, ISO 230-2, metrology, acceptance testing, machine tool verification

FAQ

Q: What is this standard?

A: ISO 10791-4:1998 is Part 4 of the ISO 10791 series that specifies test conditions, tolerances and reporting formats for assessing the positioning accuracy and repeatability of linear and rotary axes on machining centres.

Q: What does it cover?

A: It covers the acceptance criteria and measurement/ reporting formats for positioning accuracy and repeatability of linear axes (up to 2 000 mm travel) and rotary axes, and refers to ISO 230-2 for environmental, warm-up and measurement-method requirements.

Q: Who typically uses it?

A: Machine tool manufacturers, metrology and inspection laboratories, quality and procurement teams, and maintenance engineers who perform acceptance testing, verification and benchmarking of CNC machining centres.

Q: Is it current or superseded?

A: The document is the 1998 first edition. It has been subject to periodic ISO review and has been maintained as the confirmed edition; it remains the active published edition (first published 1998, confirmed on systematic review cycles).

Q: Is it part of a series?

A: Yes—ISO 10791 is a multi‑part series addressing test conditions for machining centres. Part 4 is one element of that series and is intended to be used alongside other parts (geometric tests, pallet tests, contouring, finished test piece checks, etc.) and the ISO 230 family for measurement‑method and environmental requirements.

Q: What are the key keywords?

A: Machining centres, positioning accuracy, repeatability, linear axis, rotary axis, CNC, test conditions, tolerances, ISO 230-2, metrology.