Tolerancing of Mechanical Systems
Code
10516
Academic unit
Faculdade de Ciências e Tecnologia
Department
Departamento de Engenharia Mecânica e Industrial
Credits
3.0
Teacher in charge
António José Freire Mourão, António Manuel Flores Romão de Azevedo Gonçalves Coelho
Weekly hours
4
Teaching language
Português
Objectives
Global and integrated vision of dimensional and geometric characteristics of a product in terms of function, production and inspection: i) Preparation of mechanical design of the simple and complex products for manufacturing and assembly, through proper specification of their key-characteristics represented by tolerances (dimensional and geometrical). Ii) Preparation of industrialization of products to reduce cost and time. Iii) Preparation of dimensional and geometric control.
Subject matter
1. Functional dimensioning and geometrical tolerancing - Problem of functional dimensioning. Survey of functional requirements. Chains of functional dimensions. Analysis and synthesis of tolerances with worst-case and statistical models. Geometric tolerancing. Sequence of the datum. Material conditions. Calculation of geometric tolerances. The hierarchy of subassemblies in the assembly.
2. Dimensioning and tolerancing to the operations of manufacturing and assembly - Manufacturing specifications. Allocation of tolerances. Modelling the areas of dispersion. Dimensions transfer from design to manufacturing. Manufacturing simulation. Defining intermediate stages. Indicators of processes capabilities.
3. Measuring and control - Principles and methods of measuring. Metrology equipment. Design of functional gages. Design principles of fixturing and clamping systems. Coordinate metrology.
Bibliography
Several documents prepared by the professor.
ANSELMETTI Bernard, “Tolérancement Volume 2: Méthode de cotation fonctionnelle“ Hermès – Lavoisier, 2003.
ANSELMETTI Bernard, “Tolérancement Volume 3: Cotation de fabrication et métrologie“ Hermès – Lavoisier, 2003 .
Thomas J. Drozda (Editor), Tool and Manufacturing Engineers Handbook – Vol 1: Machining, Society of Manufacturing Engineers, 1983.
Edward Roth, Integrated product design and manufacturing using GD&T, Marcel Dekker, 2003.
Lowell W. Foster, Geo-Metrics IIIm – The metric application of geometric tolerancing techniques, Addison-Wesley Publishing Company, Inc., 1994