L6-dim - VM250 Design and Manufacturing I Dimensioning...

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Dimensioning VM250 Design and Manufacturing I
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2 Outline What? Why? Lines and Symbols Dimensioning Rules Summary
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3 Outline What? Why? Lines and Symbols Dimensioning Rules Summary
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4 What? Adding length, size, and shape specs necessary to manufacture the object
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5 Outline What? Why? Lines and Symbols Dimensioning Rules Summary
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6 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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7 Outline What? Why? Lines and Symbols Dimensioning Rules Summary
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8 Lines and Symbols Types of dimensions Linear Angular Leader notes
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9 Lines and Symbols Lines used in dimensions
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10 Lines and Symbols Lines used in dimensions Arrowhead types
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11 Lines and Symbols Lines used in dimensions Leader Lines
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12 Lines and Symbols Leader line Straight inclined thin solid line Not vertical or horizontal, except for a short horizontal portion extending to the first or last letter of the note 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)
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13 Lines and Symbols Dimensioning symbols
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14 Lines and Symbols Dimensioning symbols
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15 Outline What? Why? Lines and Symbols Dimensioning Rules Summary
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16 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. Dimension texts should read horizontally Dimension text should not cross dimension, extension or visible lines
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17 Dimensioning Rules Exercise: List and correct dimensioning mistakes
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18 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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19 Dimensioning Rules Solution
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20 Dimensioning Rules Dimension lines should not cross extension lines or other dimension lines 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 angle between 30 o –60 o .
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This note was uploaded on 07/31/2011 for the course ME 250 taught by Professor Limian during the Spring '11 term at Shanghai Jiao Tong University.

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L6-dim - VM250 Design and Manufacturing I Dimensioning...

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