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dimensioning-w-solutions - ME250 Design and Manufacturing I...

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Dimensioning ME250 Design and Manufacturing I
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2 Outline What? Why? Lines and Symbols Dimensioning Rules Summary
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3 What? Adding length, size, and shape specs necessary to manufacture the object
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4 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.
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5 Lines and Symbols Types of dimensions Linear Angular Leader notes
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6 Lines and Symbols Lines used in dimensions
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7 Lines and Symbols Lines used in dimensions Arrowhead types
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8 Lines and Symbols Lines used in dimensions Leader Lines
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9 Lines and Symbols Dimensioning symbols
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10 Lines and Symbols Dimensioning symbols
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11 Dimensioning Rules Dimension lines should be uniformly spaced Not appear inside an object not touch the object unless clearness is gained. not cross extension lines or other dimension lines (Note: Extension lines can cross other extension lines or visible lines) Dimension texts should read horizontally not cross dimension, extension or visible lines Green italic texts indicate subjective rules
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12 Dimensioning Rules Exercise: List and correct dimensioning mistakes
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13 Dimensioning Rules Non-uniform spacing Missing dim. ( Ø of hole) Texts on line and Vertical texts No visible gap dim. inside the object .
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14 Dimensioning Rules Solution
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15 Dimensioning Rules Extension lines should not connect between views (so as centerlines) Leader lines should be straight, not curved, at an angle between 30 o 60 o . angle down unless doing so violates other rules point to their centers when dimensioning arc or circle, not cross other leader lines not be too long not be parallel to adjacent dimension, extension or section lines. Green italic texts indicate subjective rules
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16 Dimensioning Rules Exercise: List and correct dimensioning mistakes
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17 Dimensioning Rules Center line Connecting views Crossing dim. and ext. line Not pointing center Not angled at 30 o 60 o
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18 Dimensioning Rules Solution
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19 Dimensioning Rules
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