Unit 9 Dimensioning Learning Objectives Identify terms and

Unit 9 Dimensioning

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 Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Standard Dimensioning Symbols Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Placement of Dimensional Values Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Small Dimension Mechanics Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Angular Dimension Mechanics Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Oblique Extension Lines Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Dimensioning Rules of Choice and Placement • Contour rule Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Dimensioning Rules of Choice and Placement • Cylinder rule Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Dimensioning Rules of Choice and Placement • Bolt circles Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Dimensioning Rules of Choice and Placement • Angles Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Dimensioning Rules of Choice and Placement • Baseline dimensioning Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Dimensioning Rules of Choice and Placement • Rounded ends Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Reference Dimensions • Not for manufacturing purposes • Informational reference only Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Tabular Dimensions • Dimensions placed in table for clarity • Allows for multiple parts on one drawing Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Hole Charts • Often used for a part with a large number of repetitive features Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Coordinate Dimensioning without Dimension Lines • Also called ordinate dimensioning, arrowless dimensioning, or datum dimensioning Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Dual Dimensioning • Values in U. S. customary and metric units are both given, with one value in brackets Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.

Digital Product Definition • Annotations attached to 3 D 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.

What do you see? Print supplied by Hydro-Gear Copyright Goodheart-Willcox Co. , Inc. May not be posted to a publicly accessible website.