This International Standard describes, with reference to lSO/R 230, both geometrical and practical tests on general purpose and normal accuracy pillar type vertical drilling machines and gives corresponding permissible deviations which apply. It deals only with the verification of accuracy of the machine. It does not apply to the testing of the running of the machine (vibrations, abnormal noises, stick-slip motion of components, etc.), or to characteristics (such as speeds, feeds, etc.) which should generally be checked before testing accuracy.