1. Dimensioning

2. l Size description l Interchangeability of parts. l Knowledge of manufacturing needed l Drawings should be exactly to size

3. Object of Dimensions l Functionality l For manufacturing – eliminate calculations l Enough dimensions to fully define part l Not necessarily the dimensions to draw part.

4. Purpose of Dimensions l Linear distance l Angles l Notes

5. Dimensioning l Have gap between part and dimension l Uniform spacing

6. Placement of Dimensions l Smallest dimensions closer to part. l Witness lines extend to the part. l Witness lines should not cross dimensions Correct Wrong

7. Placement of Dimensions l Dimensions should not be placed on the part. l Dimensions should be spaced from the part. Wrong

8. Grouping Dimensions l Group dimensions together. l Group dimensions between appropriate views. Wrong Correct

9. Superfluous Dimensions Extra Dimensions Missing Dimension l There should only be enough dimensions to define the part. – A feature should only be dimensioned in one view. – it should not be possible to calculate a dimension from other dimensions.

10. Superfluous Dimensions l All Dimensions are +/-.001