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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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dimensioning
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
READING DIRECTIONSfor DIMENSIONS
  • UNIDIRECTIONAL

(Preferred for Mechanical Drafting)

  • ALIGNED

(For Architectural Drafting)

reading directions for dimensions1
READING DIRECTIONSfor DIMENSIONS

UNIDIRECTIONAL ALIGNED

(Preferred) (Architectural)

standards for dimensioning
STANDARDS FOR DIMENSIONING
  • Fine solid line

(Fine Solid Line)

arrowheads
ARROWHEADS
  • General Rule:

KEEP ARROWHEADS SMALL!

general rules for dimensioning
GENERAL RULES FOR DIMENSIONING
  • Place dimensions on the views that show the true shape of the object.

PREFERRED

AVOID

general rules for dimensioning1
GENERAL RULES FOR DIMENSIONING
  • Unless absolutely necessary, dimensions should not be placed within the views.

AVOID

AVOID

general rules for dimensioning2
GENERAL RULES FOR DIMENSIONING
  • If possible, dimensions should be grouped together rather than scattered about the drawing.
general rules for dimensioning3
GENERAL RULES FOR DIMENSIONING
  • 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.
general rules for dimensioning4
GENERAL RULES FOR DIMENSIONING
  • 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.
general rules for dimensioning5
GENERAL RULES FOR DIMENSIONING
  • Again, make sure there is no assuming any measurements.
  • Dimension: length, width and heights.
general rules for dimensioning6
GENERAL RULES FOR DIMENSIONING
  • Dimensions should not be duplicated unless they are absolutely necessary to the understanding of the drawing. Omit all unnecessary dimensions
general rules for dimensioning7
GENERAL RULES FOR DIMENSIONING
  • Plan your work carefully so the dimension lines do not cross extension lines
general rules for dimensioning8
GENERAL RULES FOR DIMENSIONING
  • Circles, holes and Arcs
general rules for dimensioning9
GENERAL RULES FOR DIMENSIONING
  • COUNTERSUNK
  • SPOTFACED
  • COUNTERBORED
general rules for dimensioning10
GENERAL RULES FOR DIMENSIONING
  • 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.
general rules for dimensioning11
GENERAL RULES FOR DIMENSIONING
  • Leader Lines always point to the center of the circle
general rules for dimensioning12
GENERAL RULES FOR DIMENSIONING
  • Arcs are dimensioned by giving the radius,
  • The capital letter R indicates that the dimension is a radius
general rules for dimensioning13
GENERAL RULES FOR DIMENSIONING

Round

  • Round
  • Fillet

Fillet

slide22
Location Dimensions-
    • Show where but now size
general rules for dimensioning20
GENERAL RULES FOR DIMENSIONING

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