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# DIMENSIONING - PowerPoint PPT Presentation

DIMENSIONING. Why are dimensions needed? ANSI Standards What style of dimensioning should be used Where should the dimensions be located Which dimensions are needed. READING DIRECTIONS for DIMENSIONS. UNIDIRECTIONAL (Preferred for Mechanical Drafting) ALIGNED

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## PowerPoint Slideshow about ' DIMENSIONING' - whitney-atkins

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Presentation Transcript

• Why are dimensions needed?

• ANSI Standards

• What style of dimensioning should be used

• Where should the dimensions be located

• Which dimensions are needed

• UNIDIRECTIONAL

(Preferred for Mechanical Drafting)

• ALIGNED

(For Architectural Drafting)

UNIDIRECTIONAL ALIGNED

(Preferred) (Architectural)

• Fine solid line

(Fine Solid Line)

• General Rule:

• Place dimensions on the views that show the true shape of the object.

PREFERRED

AVOID

• Unless absolutely necessary, dimensions should not be placed within the views.

AVOID

AVOID

• If possible, dimensions should be grouped together rather than scattered about the drawing.

• Dimensions must be complete, so no scaling of the drawing is required. It should be possible to determine sizes and shapes without assuming any measurements.

• Draw dimension lines parallel to the direction of measurement. If there are several parallel dimension lines, the numerals should be staggered to make them easier to read.

• Again, make sure there is no assuming any measurements.

• Dimension: length, width and heights.

• Dimensions should not be duplicated unless they are absolutely necessary to the understanding of the drawing. Omit all unnecessary dimensions

• Plan your work carefully so the dimension lines do not cross extension lines

• Circles, holes and Arcs

• COUNTERSUNK

• SPOTFACED

• COUNTERBORED

• Diameter Symbol is not necessary if the dimension is on the circular view itself.

• When the method on the right is used, only half a right side is needed.

• Leader Lines always point to the center of the circle

• Arcs are dimensioned by giving the radius,

• The capital letter R indicates that the dimension is a radius

Round

• Round

• Fillet

Fillet

CORRECT

NO!

NO!

NO!

NO!

CORRECT

NO!

CORRECT

NO!

NO!

LINEAR DIMENSIONS

LINEAR DIMENSIONS

What does this symbol mean?

• ANGULAR DIMENSION

ELIMINATE ONE