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Standards Development
The purpose is to standardize methods of testing the accuracy of machine tools, excluding portable power tools.
When a machine tool is used to repeatedly machine a single test piece in a mass production line, a machine tool user may want to test cut that single test piece and check its geometric accuracy, as a part of acceptance tests for a machine tool. For machines machining multiple types of test pieces, standard test pieces should be used. The geometric error of the finished test piece may be caused by various error motions of a spindle, linear axes, rotary axes, or other mechanical components of a machine tool. A proper set of machining tests should be chosen such that it exhibits the influence of machine error motions for a machine tool user’s possible machining applications. The proposed document specifies a set of machining tests that can be used to assess the influence of various quasistatic error motions of a machine tool. This document is intended to supply minimum requirements for assessing the finish-cutting accuracy of the machine.
Standard test pieces are defined in machine-specific International Standards. In some machine-specific International Standards, more recent machining applications may not be fully covered. For example, five-axis machining centres can perform turning operations by using a rotary table. The machine specific International Standard for a machining centre, ISO 10791-7:2020, describes no machining test for turning operation. Turning tests are included in ISO 13041-5:2015. This document describes a family of machining tests that covers potential applications of various types of machine tools. In general, machining tests described in machine-specific international standards, influenced by multiple causes, are not intended to identify individual error sources contributing to the measured errors of the machined test pieces. In contrast, tests for identifying quasi-static error motions described in ISO 230-1 are designed to identify individual error sources for each motion axis. This document provides test pieces for machining tests to isolate certain error sources and allow manufacturers/users to pick those corresponding to their intended machining applications.
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