ISO 4703 pdf download – Test conditions for surface grinding machines with two columns-Machines for grinding slideways -Testing of theaccuracy

ISO 4703 pdf download – Test conditions for surface grinding machines with two columns-Machines for grinding slideways -Testing of theaccuracy.
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 01 testIng equipment.
In the Observations box of the tests descnbed in the following clauses, the instructns are accompanied by a reference to the correspondrng dause 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 ii which the tests are presented in this International Standard in no way defines the practical order
of testwig. 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 descnbed in this International Standard. When the tests are required for accep(ance 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 earned out, and without agreement on the relevant expenses. cannot be considered as binding for any contracting party.
4.5 MeasurIng Instruments
The measurng 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 ISO 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 stillness 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 manufacturers assembly workshop; therefore, if the test is being carned out on a machine simply resting on the floor, flies 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 arid the coolant on its lop. The test shall then be carried out atler moving the table and dehvenng coolani for a time sufficient to let It reach the working corition. 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 in prior to the tests.