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This International Standard specifies, with reference to ISO 230-1 and ISO 230-2, geometric tests, machining tests and tests for checking accuracy and repeatability of positioning on general purpose and normal accuracy surface grinding machines with two columns for grinding slideways. It also specifies the applicable tolerances corresponding to the above-mentioned tests. This International Standard is applicable to machines with rectilinear grinding movements and with a movable table. It does not include machines with a fixed table or with a rotary table movement. This International Standard deals only with the verification of the accuracy of the machine. It does not apply to the testing of the machine operation (vibration, abnormal noises, stick-slip motion of components, etc.) nor to machine characteristics (such as speeds, feeds, etc.), which should generally be checked before testing the accuracy. This International Standard provides the terminology used for the principal components of the machine and the designations of the axes with reference to ISO 841 [1] . NOTE In addition to terms used in the three official ISO languages (English, French and Russian), annex A of this International Standard gives the equivalent terms in the German and Italian languages; these are published under the responsibility of the member bodies for Germany (DIN) and Italy (UNI). However, only the terms given in the official languages can be considered as ISO terms.