unit 9 dimensioning copyright goodheart-willcox co., inc. may not be posted to a publicly accessible...
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Unit 9Dimensioning
Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website.
Learning Objectives
• Identify terms and measurements associated with dimensioning mechanics.
• Identify symbols that have been standardized for dimensioning notations.
• Explain the choice and placement rules drafters use when creating dimensions.
Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website.
Learning Objectives
• Identify and discuss various systems and methods for dimensioning.
• Describe the additional types of dimensions used in special ways.
• Discuss alternative methods for describing size and applying dimensions.
Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website.
Dimensioning Mechanics
• Dimensioning mechanics involves the size and spacing for all components of the dimension
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Standard Dimensioning Symbols
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Placement of Dimensional Values
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Small Dimension Mechanics
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Angular Dimension Mechanics
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Oblique Extension Lines
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Dimensioning Rules of Choiceand Placement
• Contour rule
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Dimensioning Rules of Choiceand Placement
• Cylinder rule
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Dimensioning Rules of Choiceand Placement
• Bolt circles
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Dimensioning Rules of Choiceand Placement
• Angles
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Dimensioning Rules of Choiceand Placement
• Baseline dimensioning
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Dimensioning Rules of Choiceand Placement
• Rounded ends
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Reference Dimensions
• Not for manufacturing purposes
• Informational reference only
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Tabular Dimensions
• Dimensions placed in table for clarity• Allows for multiple parts on one drawing
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Hole Charts
• Often used for a part with a large number of repetitive features
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Coordinate Dimensioning without Dimension Lines• Also called ordinate dimensioning, arrowless
dimensioning, or datum dimensioning
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Dual Dimensioning
• Values in U.S. customary and metric units are both given, with one value in brackets
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Digital Product Definition
• Annotations attached to 3D models• Drawing graphic sheet can be included
Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website.
Undimensioned Drawings
• Describes size of an object without annotations• True geometry view = true profile of part• Parts with irregular contours:
– Printed circuit boards– Wire harnesses– Formed sheet metal sections
Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website.
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