BS ISO 19744:2020 Test conditions for numerically controlled broaching machines — Testing of accuracy — Vertical surface type broaching machines.
5.3 Testing sequence
The sequence in which the tests are presented in this document 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.
5.4 Tests to be performed
When testing a vertical broaching machine, it is neither always necessary nor possible to carry out all the tests described in this document. When the tests are required for acceptance purposes, it is up to the user to choose, in agreement with the manufacturer/supplier, 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. A simple reference to this document 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.
5.5 Tolerances and minimum tolerance
In this document, all tolerance values (see ISO 230-1:2012, 4.1) are guidelines. When they are used for acceptance purposes other values can be agreed on between the user and the manufacturer/supplier. The required/agreed tolerance values are to be clearly stated when ordering the machine.
When establishing the tolerance for a measuring length different from that given in this document
(see ISO 230-1:2012, 4.1.2), it shall be taken into consideration that the minimum value of tolerance is
5.6 Measuring instruments
Measuring instruments indicated in the tests described in Clauses 6 to are examples only. Other instruments capable of measuring the same quantities and having the same, or a smaller, measurement uncertainty may be used. Reference shall be made to ISO 230-1:2012, 4.1.1, which indicates the relationship between measurement uncertainties and the tolerances.
When a dial gauge” is referred to, it can mean not only dial test indicators (DTI) hut any type of linear displacement sensor such as analogue or digital dial gauges, linear variable differential transformer (LVDTs, linear scale displacement gauges, or non-contact sensors, when applicable to the test concerned.
Similarly, when a “straightedge” is referred to, it can mean any type of straightness reference artefact, such as a granite or ceramic or steel or cast iron straightedge, one arm of a square, one generating line on a cylindrical square, any straight path on a reference cube, or a special, dedicated artefact manufactured to fit in the T-slots, optical instruments or other references.
In the same way, when a ‘square” is mentioned, it can mean any type of squareness reference artefact, such as a granite or ceramic or steel or cast-iron square, a cylindrical square, a reference cube, or, again, a special, dedicated artefact.
For reasons of simplicity, diagrams in this document illustrate only one type of broaching machine.
BS ISO 19744 pdf download.