Presentation on theme: " Apply correct dimensioning procedures Learn the technique of dimensioning Understand the different line types and techniques used to show dimensions."— Presentation transcript:
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?
The numerical value that defines the size, shape, location, surface texture, or geometric characteristic of a feature.
Thin, black line (0.5mm graphite) 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”
Thin, black line (0.5mm graphite) 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”
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
Typically centered on the dimension line If dimensions are right above one another they are staggered 1/8” tall Fractions are a ¼” tall
Dimension refers to the number. 20 11 23 10 Largest dimension to the outside. Extension lines may cross Leave enough room between object and dimension lines.
Dimensions should be placed outside the drawing whenever possible Extension lines should not cross dimension lines
Stagger the dimension text on parallel dimensions
Unidirectional: All dimensions are horizontal Aligned: Dimensions are parallel to object lines
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