ISO 4703:2001 pdf download
ISO 4703:2001 pdf download.Test conditions for surface grinding machines with two columns-Machines for grinding slideways -Testing of the accuracy.
4 Preliminary remarks
4.1 Measuring units
In this International Standard, all linear dimensions, deviations and corresponding tolerances are expressed in millimetres; angular dimensions are expressed in degrees, and angular deviations and the corresponding tolerances are expressed in ratios but, in some cases, microradians or arcseconds may be used for clarification purposes. The equivalence of the following expressions should always be kept in mind:
4.2 Reference to ISO 230-1
To apply this International Standard, reference shall be made to ISO 230-1, especially for the installation of the machine before testing, warming up of the spindle and other moving components, description of measuring methods and recommended accuracy of testing equipment.
In the “Observations” box of the tests described in the following clauses, the instructions are accompanied by a reference to the corresponding clause in ISO 230-1 in cases where the test concerned is in compliance with the specifications of ISO 230-1.
Reference should be made to ISO 230-2 for positioning tests.
4.3 Testing sequence
The sequence in which the tests are presented in this International Standard in no way defines the practical order of testing. In order to make the mounting of instruments or gauging easier, tests may be performed in any order.
4.4 Tests to be performed
When testing a machine, it is not always necessary or possible to carry out all the tests described in this International Standard. When the tests are required for acceptance purposes, it is up to the user to choose, in agreement with the supplier/manufacturer, those tests relating to the components and/or the properties of the machine which are of interest. These tests are to be clearly stated when ordering a machine. Mere reference to this International Standard for the acceptance tests, without specifying the tests to be carried out, and without agreement on the relevant expenses, cannot be considered as binding for any contracting party.
4.5 Measuring instruments
The measuring instruments indicated in the tests described in clauses 6, 7 and 8 are examples only. Other instruments measuring the same quantities and having at least the same accuracy may be used. Dial gauges shall have a resolution of at least 0,00 1 mm.
4.6 Minimum tolerance
When establishing the tolerance for a measuring length different from that given in this International Standard (see
2.311 of 150 230-1:1996), it shall be taken into consideration that the minimum value of tolerance is 0,005 mm.
4.7 Machining tests
Machining tests shall be made with finishing cuts only. Roughing cuts shall be avoided since they are liable to generate appreciable cutting forces.
5 Specific installation conditions
5.1 Foundations
Foundations are essential for providing the necessary stiffness to this type of machine which should always be installed in the user’s workshop on foundations designed and manufactured correctly.
Foundations suitable to every type of machine are not always available in the manufacturer’s assembly workshop; therefore, if the test is being carried out on a machine simply resting on the floor, this shall be taken into account and recorded on the test report.
5.2 Isolation
Foundations should be isolated from the surrounding floor in order not to transmit vibrations and/or heat.
5.3 Thermal conditions
When the table is hydraulically operated, it is subject to thermal distortions due to the temperature difference between the oil beneath and the coolant on its top. The test shall then be carried out after moving the table and delivering coolant for a time sufficient to let it reach the working condition, following the manufacturer’s instructions.
5.4 Testing temperature
The test room temperature variation should not exceed 2 °C. Otherwise, the ambient temperature conditions throughout the tests shall be specified by agreement between the supplier/manufacturer and user. The machine should be placed in this environment at least 24 h prior to the tests.
