ISO 230-2-2014 PDF

Full title and description

Test code for machine tools — Part 2: Determination of accuracy and repeatability of positioning of numerically controlled axes. This part of ISO 230 specifies test methods and measurement procedures for assessing the positioning accuracy and repeatability of individual numerically controlled (NC) machine tool axes (linear and rotary), for use in type testing, acceptance testing, periodic verification and machine compensation activities.

Abstract

ISO 230-2:2014 defines direct measurement methods for individual NC axes to quantify positioning errors and repeatability through repeated measurements at defined positions. Test parameters, calculation of related indicators and guidance on estimating measurement uncertainty (with reference to ISO/TR 230-9) are provided to ensure consistent evaluation of axis performance. The edition includes an amendment issued in 2016.

General information

• Status: Published / current (confirmed following ISO review).
• Publication date: 2014 (Edition 4, published May 2014).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.040.20 (Numerically controlled machines); 25.080.01 (Machine tools in general).
• Edition / version: Edition 4 (ISO 230-2:2014) — with Amendment 1 published 2016 (ISO 230-2:2014/Amd 1:2016).
• Number of pages: 43 (main edition text); amendment document is 3 pages.

Scope

Specifies methods for testing and evaluating the accuracy and repeatability of positioning of numerically controlled machine tool axes by direct measurement of individual axes on the machine. The procedures apply to both linear and rotary axes, and are suitable for type testing, acceptance testing, comparison testing, periodic verification and for supporting machine compensation. Guidance on defining test parameters and estimating uncertainties is included.

Key topics and requirements

• Definitions of positioning accuracy and repeatability for NC axes (linear and rotary).
• Test set-ups and environmental/test conditions required for repeatable measurements.
• Procedures for performing repeated measurements at specified positions and directions (uni- and bi-directional tests).
• Calculation methods for position error metrics and repeatability statistics.
• Guidance on estimating measurement uncertainty (references to ISO/TR 230-9, Annex C).
• Provisions for applying results to acceptance testing, comparison tests, periodic verification and machine compensation.
• References to amendment(s) that update or correct the original 2014 text.

Typical use and users

Used by machine tool manufacturers, quality/inspection engineers, metrology laboratories, test houses, research institutions and end users commissioning or accepting NC machine tools. Typical applications include factory acceptance tests, production acceptance, benchmarking between machines, periodic verification and setup/compensation activities for improving machining accuracy.

Related standards

ISO 230-2 is part of the ISO 230 series ("Test code for machine tools"). Relevant related parts include ISO 230-1 (geometric accuracy under no-load/quasi-static conditions), ISO 230-3 (thermal effects), ISO 230-4 (circular tests for NC machine tools), ISO 230-6, ISO 230-7 (geometric accuracy of axes of rotation), and other parts addressing probing and measuring systems. The document is maintained by ISO/TC 39/SC 2 (test conditions for metal-cutting machine tools).

Keywords

machine tools, test code, numerically controlled axes, positioning accuracy, repeatability, NC axis testing, metrology, acceptance testing, measurement uncertainty, ISO 230 series.

FAQ

Q: What is this standard?

A: ISO 230-2:2014 is Part 2 of the ISO 230 test code series; it specifies methods to determine the accuracy and repeatability of positioning of numerically controlled machine tool axes.

Q: What does it cover?

A: It covers test procedures, measurement setups, required test conditions, calculation of error and repeatability parameters, and guidance for estimating uncertainty — applicable to both linear and rotary NC axes for type, acceptance and verification testing.

Q: Who typically uses it?

A: Machine tool manufacturers, inspection and quality engineers, calibration and metrology labs, test houses, and users performing acceptance or periodic verification of NC machines.

Q: Is it current or superseded?

A: ISO 230-2:2014 (Edition 4) is the current published edition; it was published in 2014 and an amendment was published in 2016. The ISO catalogue indicates the 2014 edition as published and subsequently reviewed/confirmed (remains current as of ISO reviews).

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 230 "Test code for machine tools" series, which contains multiple parts addressing geometric accuracy, thermal effects, circular tests, probing systems and other test conditions.

Q: What are the key keywords?

A: Positioning accuracy, repeatability, NC axes, machine tool testing, acceptance testing, metrology, ISO 230, measurement uncertainty.