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Dimensioning Standards …..Why are they needed?

Dimensioning Standards …..Why are they needed?. To give manufacturers and part fabricators the information they need to create complicated parts. AMERICAN NATIONAL STANDARDS INSTITUTE Organization that oversees products, services, drawing plans, etc. Working Drawing. How are they read?.

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Dimensioning Standards …..Why are they needed?

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  1. Dimensioning Standards…..Why are they needed? • To give manufacturers and part fabricators the information they need to create complicated parts. • AMERICAN NATIONAL STANDARDS INSTITUTE • Organization that oversees products, services, drawing plans, etc

  2. Working Drawing How are they read? • Appropriate units of measure • Inches • Millimeters • Decimals recommended over fractions of an inch. • Two common systems

  3. What is wrong with this picture?

  4. With this one?

  5. Importance of standards!

  6. Unidirectional System

  7. Aligned System

  8. 1/16” GAP Standard Spacing 1/4” 1/4” 3/8” Extension Lines Dimension Lines

  9. Length Arrowheads • Arrowheads on dimension lines • Touch extension lines and are drawn to specific proportion 1/3 of Arrowhead Length Can be slightly curved

  10. Dimension Placement • Whenever possible, dimensions should be placed between the views to which they relate. Avoid Preferred

  11. Extension Line Conflict • Line conflict should be kept to a minimum. • Place smallest dimensions closest to the object. Preferred Avoid

  12. Hidden Lines • Should not be used for dimension unless there is no other way. Preferred Avoid

  13. TYP. Circles and Curves • Circles/curves are dimensioned in a number of ways • depending upon diameter/radius • TYP. = Typical unless noted otherwise

  14. Hole Notes • Special symbols • simplify dimensioning multiple or complex holes Cutting Plane Line Section Lines

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