lecture6 - Mech 220 Intro to Engineering CAD MECHANICAL...

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Inst. Charbel Seif, Mech 220 11/09/2005 1 Mech Mech 220 220 Intro to Engineering CAD Intro to Engineering CAD FALL 2006-07 Inst.: Charbel Seif Office: Wing B - B-303 Extension: 3629 e-mail: cs05@aub.edu.lb MECHANICAL DRAWINGS: MECHANICAL DRAWINGS: DIMENSIONING & TOLERANCING DIMENSIONING & TOLERANCING 1/3 1/3
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Inst. Charbel Seif, Mech 220 11/09/2005 2 Mech Mech 220: 1st LECTURE 220: 1st LECTURE MECHANICAL DRAWING: MECHANICAL DRAWING: REMEMBER????? REMEMBER????? MECHANICAL DRAWING is a “formatted document that specifies the required attributes of a part to be manufactured”. DRAWING ATTRIBUTES: 1. GEOMETRIC: dimensions & tolerances factors of form (flatness, squareness. .) 2. CONSTRUCTION: material, assembly, finish,. .
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Inst. Charbel Seif, Mech 220 11/09/2005 3 Mech Mech 220: 6th LECTURE 220: 6th LECTURE DIMENSIONING DIMENSIONING ± Dimensions are used to describe the sizes and relationships between features in your drawing. ± Dimensions are used to manufacture parts and to inspect the resulting parts to determine if they are acceptable. ± Drawings with dimensions and notes often serve as construction documents and legal contracts. ± ANSI Y14.5M-1994 is the current standard. Other standards may apply.
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Inst. Charbel Seif, Mech 220 11/09/2005 4 ± Standards are different in different career areas. ± Most of the examples in this course will be of mechanical parts. ± Civil, Electrical, Construction, and other areas follow similar practices, but sometimes with less need for precision in measurements. ± Dimensioned drawings are a part of a contractual document . Mech Mech 220: 6th LECTURE 220: 6th LECTURE Standards for Your Career Field Standards for Your Career Field
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Inst. Charbel Seif, Mech 220 11/09/2005 5 Mech Mech 220: 6th LECTURE 220: 6th LECTURE DIMENSIONING DIMENSIONING Example of a properly dimensioned drawing Example of a properly dimensioned drawing ± Every Object has three dimensions describing each of the geometric shapes making up the object “height, width and depth”. ± Selecting the dimension position requires more consideration than selecting dimension
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Inst. Charbel Seif, Mech 220 11/09/2005 6 ± Dimension line, Extension line, Leader, Dimension offset or gap, Centerline, ± Finish mark, Dimension value ± Baseline dimensioning, Chained dimensioning Mech Mech 220: 6th LECTURE 220: 6th LECTURE DIMENSIONING DIMENSIONING anatomy of a dimension anatomy of a dimension
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Inst. Charbel Seif, Mech 220 11/09/2005 7 Mech Mech 220: 6th LECTURE 220: 6th LECTURE DIMENSIONING: DIMENSIONING: the dimension value the dimension value THE DIMENSION VALUE
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Inst. Charbel Seif, Mech 220 11/09/2005 8 Mech Mech 220: 6th LECTURE 220: 6th LECTURE DIMENSIONING: DIMENSIONING: What is a dimension? What is a dimension?
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lecture6 - Mech 220 Intro to Engineering CAD MECHANICAL...

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