Dimensioning
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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

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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)


Dimensioning

  • UNIDIREC TIONAL


Aligned

ALIGNED


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


Dimensioning

  • Location Dimensions-

    • Show where but now size


General rules for dimensioning14

GENERAL RULES FOR DIMENSIONING


General rules for dimensioning15

GENERAL RULES FOR DIMENSIONING

CORRECT

NO!

NO!

NO!

NO!


General rules for dimensioning16

GENERAL RULES FOR DIMENSIONING

CORRECT

NO!


General rules for dimensioning17

GENERAL RULES FOR DIMENSIONING

CORRECT

NO!

NO!


General rules for dimensioning18

GENERAL RULES FOR DIMENSIONING

LINEAR DIMENSIONS


General rules for dimensioning19

GENERAL RULES FOR DIMENSIONING

LINEAR DIMENSIONS


General rules for dimensioning20

GENERAL RULES FOR DIMENSIONING

What does this symbol mean?


General rules for dimensioning21

GENERAL RULES FOR DIMENSIONING

  • ANGULAR DIMENSION


General rules for dimensioning22

GENERAL RULES FOR DIMENSIONING

ELIMINATE ONE


General rules for dimensioning23

GENERAL RULES FOR DIMENSIONING


General rules for dimensioning24

GENERAL RULES FOR DIMENSIONING


General rules for dimensioning25

GENERAL RULES FOR DIMENSIONING


General rules for dimensioning26

GENERAL RULES FOR DIMENSIONING


General rules for dimensioning27

GENERAL RULES FOR DIMENSIONING


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