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 |
|
Be able to understand the basic
rules of dimensioning |
|
Apply dimensions to objects in
accordance with engineering standards |
|
Define the following items: Dimension
line, Extension line, Reference dimension, and Leader |
|
Be able to recognize the following
machined holes: Spotface, Counterbore, Countersink, and Counterdrill |
| Class 18.2: |
Dimensioning/Tolerancing in
AutoCAD |
|
Know dimensioning techniques for
machined holes |
|
Know how to dimension standard
parts |
|
Determine tolerances for use in
design |
|
Apply tolerances using AutoCAD |
Class Agenda
| Class 14.2: |
Basic Dimensioning |
|
RAT - quiz |
|
Lecture material on
basic terminolgy, styles, geometric features and errors in dimensioning |
|
Lecture material on machines holes |
| |
Team exercise |
| Class 18.2: |
Dimensioning |
|
Review of dimensioning
terminology and rules |
| |
Individual HW assignment |
|
Pair Exercise |
|
Lecture Material on
dimensioning in AutoCAD |
|
Lecture material on dimensioning
machine holes, threads, and other standard parts |
| |
HW assignment |
| |
Think-Pair-Share |
| |
Tolerancing in AutoCAD |
| |
Lecture material on general
concepts of tolerancing |
| |
Lecture material on Linear Tolerances
in AutoCAD |
| |
Linear tolerance example |
| |
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.
|
