Dimensioning Guidelines

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Presentation transcript:

Dimensioning Guidelines Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Dimension Guidelines There are dozens of rules, dos and don’ts, and guidelines associated with dimensioning. The purpose of this presentation is to introduce those guidelines that are most critical. These 8 rules have been taken from the IED curriculum as the guidelines that we most want middle school students to recognize. You may use the IED presentation on Dimension Guidelines if you want to include the 16 guidelines that they discuss.

Dimensioning Guidelines Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques 1. Dimension once in best view. Incorrect

Dimensioning Guidelines Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques 1. Dimension once in best view. References: Pg 337 Engineering Drawing and Design 3rd Edition by David Madsen, et. al. Pg 109 Fundamentals of Modern Drafting by Paul Wallach Pg 425 Technical Drawing 9th Edition by Frederick Giesecke, et. al. Pg 701 Technical Graphics Communication 3rd Edition by Gary Bertoline & Eric Wiebe Correct

Dimensioning Guidelines Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques 2. Locate dimensions between adjacent views - Avoid dimensioning over or through the object. Incorrect References: Pg 342 Engineering Drawing and Design 3rd Edition by David Madsen, et. al. Pg 394, 404, 426 Technical Drawing 9th Edition by Frederick Giesecke, et. al. Pg 692 Technical Graphics Communication 3rd Edition by Gary Bertoline & Eric Wiebe

Dimensioning Guidelines Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques 2. Locate dimensions between adjacent views - Avoid dimensioning over or through the object. References: Pg 342 Engineering Drawing and Design 3rd Edition by David Madsen, et. al. Pg 108 Fundamentals of Modern Drafting by Paul Wallach Pg 426 Technical Drawing 9th Edition by Frederick Giesecke, et. al. Notice this dimension is not between the views, but this is a better placement than dimensioning to the hidden line in the right side view.

Dimensioning Guidelines Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques 3. Holes are located by their centerlines. A circle is dimensioned by its diameter and an arc by its radius. Incorrect References: Pg 351 Engineering Drawing and Design 3rd Edition by David Madsen, et. al. Pg 109 Fundamentals of Modern Drafting by Paul Wallach Pg 411, 427 Technical Drawing 9th Edition by Frederick Giesecke, et. al. Pg 693 Technical Graphics Communication 3rd Edition by Gary Bertoline & Eric Wiebe

Dimensioning Guidelines Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques 3. Holes are located by their centerlines. A circle is dimensioned by its diameter and an arc by its radius. Correct References: Pg 351 Engineering Drawing and Design 3rd Edition by David Madsen, et. al. Pg 109 Fundamentals of Modern Drafting by Paul Wallach Pg 411, 427 Technical Drawing 9th Edition by Frederick Giesecke, et. al. Pg 693 Technical Graphics Communication 3rd Edition by Gary Bertoline & Eric Wiebe Note: The top view was removed because it is not needed to completely communicate the object’s geometry.