Dimensioning and Tolerance
When are Dimensioning and Tolerance Covered?
Basic Dimensioning is introduced in ENGR111 during Class 14.2*
Dimensioning is revisited at the beginning of ENGR112 during Class 18.2*.
Tolerancing is introduced in ENGR112 during Class 18.2*.
*Explaination of Class numbering System
Objectives
| Class 14.2: |
Basic Dimensioning |
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Be able to understand the basic rules of dimensioning |
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Apply dimensions to objects in accordance with engineering standards |
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Define the following items: Dimension line, Extension line, Reference dimension, and Leader |
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Be able to recognize the following machined holes: Spotface, Counterbore, Countersink, and Counterdrill |
| Class 18.2: |
Dimensioning/Tolerancing in AutoCAD |
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Know dimensioning techniques for machined holes |
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Know how to dimension standard parts |
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Determine tolerances for use in design |
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Apply tolerances using AutoCAD |
Class Agenda
| Class 14.2: |
Basic Dimensioning |
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RAT - quiz |
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Lecture material on basic terminolgy, styles, geometric features and errors in dimensioning |
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Lecture material on machines holes |
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Team exercise |
| Class 18.2: |
Dimensioning |
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Review of dimensioning terminology and rules |
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Individual HW assignment |
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Pair Exercise |
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Lecture Material on dimensioning in AutoCAD |
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Lecture material on dimensioning machine holes, threads, and other standard parts |
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HW assignment |
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Think-Pair-Share |
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Tolerancing in AutoCAD |
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Lecture material on general concepts of tolerancing |
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Lecture material on Linear Tolerances in AutoCAD |
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Linear tolerance example |
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HW assignment |
Why are Dimensioning and Tolerance Important?
Dimensioning allows a designed part to be manufactured and are always in real world units.
Tolerancing is important to the manufacturer because it determines the accuracy and cost of the final product. In general, tolerances should be as large as possible to balance expense with function.
- Class 14.2 Powerpoint
- Class 18.2 Powerpoint
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