Dimensioning Rules in Engineering Drawing
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The document outlines the essential rules and methods of dimensioning in technical drawings, focusing on defining dimensions as indicators of size and location. It describes two primary methods of dimensioning (aligned and uni-directional) and highlights various arrangements like chain, parallel, and combined. Additionally, it lists important dimensioning rules to ensure clarity and reproducibility in drawings.
Dimensioning Rules in Engineering Drawing
- 2. Dimensioning Rules 1. What is a dimension? 2. Methods of dimensioning. 3. Arrangements of dimensions. 4. Rules of dimensioning. www.udemy.com/ed
- 3. 1. What is a dimension? Dimensions are used to show the size, location, orientation, form or other geometric characteristics of a part. Dimensions are written on the lines called dimension lines Dimensioning Rules www.udemy.com/ed
- 4. Dimensioning Rules Methods of dimensioning There are two ways of writing numbers on dimension lines 1.Aligned method 2.Uni-directional method www.udemy.com/ed
- 5. Dimensioning Rules Arrangements of dimensions Some important ways of placing dimension lines are: Chain, Parallel & combined method. Chain Dimensioning Parallel Dimensioning Combined Dimensioning www.udemy.com/ed
- 6. Dimensioning Rules Rules of dimensioning 1. Every aspect of drawing should be dimensioned in a way that it can be reproduced. 2. No dimension should be repeated. Avoid unnecessary dimensions. 3. One dimension line should not go over another dimension line. 4. Extension line should touch the line to be dimensioned. 5. As far as possible, dimension should be placed outside the main diagram. 6. Under no conditions dimension should be placed below the dimension line. 7. For narrow portions, dimension line can be extended beyond extension lines. 8. Symbols should always precede the number. 9. Dimensions should not have units with the number. 10. Extension should be taken from visible and not from hidden or dashed lines. www.udemy.com/ed
- 7. Dimensioning Rules Rules of dimensioning To understand these rules let us see some example diagrams in which they are exploited. Example 1: www.udemy.com/ed
- 8. Dimensioning Rules Rules of dimensioning To understand these rules let us see some example diagrams in which they are exploited. Example 2: www.udemy.com/ed