PPT-Introduction to Dimensioning

2012 Project Lead The Way Inc Introduction to Engineering Design Dimensions should reflect actual size of the object not the scaled size The dimension measured on the drawing is ¾ in but the actual dimension of the part is 2 in Therefore show 200 on drawing. 1 All dimension extension and leader lines shou ld be thin sharp dark lines 5mm2H 2 Extension lines indicate the points between which the dimension figures apply They are drawn perpendicular to the dimension lines start with a visibl e gap 132 betw Datum and Tolerance Accumulation . Possible Tolerance Conditions . Block Example . Specific Tolerances for Slip and Press Fits. Machine Tolerances . Tolerance Block . This presentation includes the following concepts . Dimensions. What is dimensioning?. Communicating shape and size in a clear fashion. #1 Rule for Dimensioning: Provide the dimensions which most clearly and accurately show the size and location of a feature. . Unit 1 – Introduction, Symbols, and Terms. 2. Everyone should have a workbook to follow along. . It contains necessary reference information along with class exercises.. Page numbers in yellow on the slides match pages in the workbook.. Introduction • Rule of Thumb • meter and yard • International System of Units (SI system)  ISO standards • American National Standards Institutes (ANSI)  1. Dimensions should NOT be duplicated, nor should the same information be given in two different ways.. Incorrect. 1. Dimensions should NOT be duplicated, nor should the same information be given in two different ways.. Dimensioning. The important information on a drawing is the dimension and tolerance of all of its features.. Lines used in dimensioning. Dimension line:. A dimension line is a thin, dark line terminated by arrowheads and indicates the extent of the dimension (figure a).. 1. Dimensions should NOT be duplicated, nor should the same information be given in two different ways.. Incorrect. 1. Dimensions should NOT be duplicated, nor should the same information be given in two different ways.. © 2012 Project Lead The Way, Inc.. Introduction to Engineering Design. Dimensioning Standards. In order for the drawings to be dimensioned so that all people can understand them, we need to follow standards that every company in the world must follow. Standards are created by these organizations. Making things fit. General rules of dimensioning (1). Dimensions . should NOT be duplicated, or the same information be given in two different . ways.. No . unnecessary dimensions should be used - only those needed to produce or inspect the . Unit 1 – Introduction, Symbols, and Terms. 2. Everyone should have a workbook to follow along. . It contains necessary reference information along with class exercises.. Page numbers in yellow on the slides match pages in the workbook.. Will Durfee & Tim . Kowalewski. Department of Mechanical Engineering. University of Minnesota. Opening comments. Engineering graphics is the method for documenting a . design. Mechanical engineering students must be familiar with standards of engineering graphics as it is expected in industry. Unit 2 – Limits of Size. Overview of Rules. There are four general rules. Taylor’s rule. Limits of size. . Regardless of Feature Size (RFS) is the default.. Pitch cylinder axis is reference for thread and screws.. Introduction to Standard Geometrical Tolerance Datum and Tolerance Accumulation Possible Tolerance Conditions Block Example Specific Tolerances for Slip and Press Fits Machine Tolerances Tolerance Block