GPS on the example of an auto-generating 3D model with free tolerance
GPS, i.e. geometric product specification, is a graphical system consisting of symbols, rules, and definitions that describe the requirements for dimensions, shapes, profiles, directions, and positioning and milling of a finished product in a three- -dimensional space. The paper focuses on the group of tolerances within the product shape, taking into account the so-called free tolerance. For the purposes of this work, a 3D model of the cylinder described using the functional dependencies, has been created, which is used to illustrate the concept of GPS in three-dimensional space. The CATIA engineering environment has been applied for this purpose and a suitable numerical parameters have been assigned to each of the dimensions and tolerances. The use of a self-generating 3D model makes it easier to illustrate the GPS concept by graphically displaying the resulting tolerance field. The autogenerating model has been used to verify the correctness of the piston gauge.