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5-dimensioning - ME250 Design and Manufacturing I...

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ME250 Design and Manufacturing I Di i i Dimensioning
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Outline What? Why? Lines and Symbols Dimensioning Rules Summary 2
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Outline What? Why? Lines and Symbols Dimensioning Rules Summary 3
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What? Adding length, size, and shape specs necessary to manufacture the object 4
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Outline What? Why? Lines and Symbols Dimensioning Rules Summary 5
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Why? Parts can be: Manufactured in a different size from the drawn size. Some dimensions are more important than others Manufactured in multiple ways and error accumulates differently. 6
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Outline What? Why? Lines and Symbols Dimensioning Rules Summary 7
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Lines and Symbols Types of dimensions Linear Angular Leader notes 8
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Lines and Symbols Lines used in dimensions 9
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Lines and Symbols Lines used in dimensions Arrowhead types 10
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Lines and Symbols Lines used in dimensions Leader Lines 11
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Lines and Symbols Avoid Crossing leader lines. Long leader lines Leaders that are parallel to adjacent dimension, extension or section lines. Small angles between the leader and the terminating surface (30-60 o advised) 12
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Lines and Symbols Dimensioning symbols 13
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Lines and Symbols Dimensioning symbols 14
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Outline What? Why? Lines and Symbols Dimensioning Rules Summary 15
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Dimensioning Rules Use uniform spacing between dimension lines Do not dimension inside an object Dimension line should not touch the object unless clearness is gained. Di i h ld d h i ll Dimension texts should read horizontally Dimension text should not cross dimension, extension or visible lines 16
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Dimensioning Rules Exercise: List and correct dimensioning mistakes 17
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Dimensioning Rules Dimension lines should not cross extension lines or other dimension lines E i li h i li Extension lines can cross other extension lines or visible lines Extension lines and centerlines should not connect between views Leader lines should be straight, not curved, at an
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