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DIMENSIONING

DIMENSIONING. Standard. Apply correct dimensioning procedures. Being able to dimension well requires you to develop three different abilities:. Learn the technique of dimensioning Understand the different line types and techniques used to show dimensions Learn the placement of dimensions

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DIMENSIONING

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  1. DIMENSIONING

  2. Standard • Apply correct dimensioning procedures

  3. Being able to dimension well requires you to develop three different abilities: • Learn the technique of dimensioning • Understand the different line types and techniques used to show dimensions • Learn the placement of dimensions • Can you pick the most logical and practical place to put dimensions with respect to an object? • Learn the choice of dimensions • Which dimensions should you show and which ones should you not show?

  4. Dimension • The numerical value that defines the size, shape, location, surface texture, or geometric characteristic of a feature.

  5. Dimension Line • Thin, black line • Ends with an arrowhead • Arrowhead indicates direction and length of a dimension • Gap for dimension is usually near the middle • Distance from the object line is 3/8” • Distance away from other dimension lines is ¼”

  6. Extension Line • Thin, black line • Extends from the point on the drawing that the dimension refers to • Drawn at right angles to dimension lines • Distance (gap) from object line before the extension line starts is 1/16” • Distance that the line extends past the last arrow is 1/8”

  7. Arrows • Drawn free hand • Uniform in size and style • Do not vary according to size of drawing or length of dimension • 3 times as long as they are wide • 1/8” long • Narrow and solid

  8. Lettering • Typically centered on the dimension line • If dimensions are right above one another they are staggered • 1/8” tall • Fractions are a ¼” tall

  9. Dimension refers to the number. Largest dimension to the outside. 10 20 Extension lines may cross Leave enough room between object and dimension lines. 23 11 Sample Dimensioning

  10. Group Dimensioning • Dimensions should be placed outside the drawing whenever possible • Extension lines should not cross dimension lines

  11. Stagger Dimension Text • Stagger the dimension text on parallel dimensions

  12. Unidirectional and Aligned Methods • Unidirectional: All dimensions are horizontal • Aligned: Dimensions are parallel to object lines

  13. Principles of Good Dimensioning • Each feature of an object is only dimensioned once • Dimensions should be placed in the most descriptive view of the feature • Dimension lines should be aligned and grouped when possible

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