dimension guidelines_2.pdf
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8/16/2019 Dimension Guidelines_2.pdf
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 1
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
1. Dimensions should NOT be duplicated, or
the same information given in two differentways.
Incorrect
1. Dimensions should NOT be duplicated, or
the same information given in two different
ways.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 2
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
2. No unnecessary dimensions should be
used –
only those needed to produce orinspect the part.
Incorrect
2. No unnecessary dimensions should be
used – only those needed to produce or
inspect the part.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 3
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
3. Dimensions should be attached to the view
that best shows thecontour
of the featureto be dimensioned.
Incorrect
3. Dimensions should be attached to the view
that best shows the contour of the feature
to be dimensioned.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 4
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
4. Whenever possible, avoid dimensioning to
hidden lines and features.
Incorrect
4. Whenever possible, avoid dimensioning to
hidden lines and features.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 5
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
5. Avoid dimensioning over or through the
object.
Incorrect
5. Avoid dimensioning over or through the
object.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 6
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
6. A dimension should be attached to only
one view; for example, extension linesshould not connect two views.
Incorrect
6. A dimension should be attached to only
one view; for example, extension lines
should not connect two views.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 8
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
8. Whenever possible, avoid sending extension
lines through object views.
Incorrect
8. Whenever possible, avoid sending extension
lines through object views.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 9
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
9. In general, a circle is dimensioned by its
diameter and an arc by its radius.
10. Holes are located by their centerlines,
which may be extended and used as
extension lines.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 10
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
11. Holes should be located and sized in the
view that shows the feature as a circle.
Incorrect
11. Holes should be located and sized in the
view that shows the feature as a circle.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 11
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
12. Do not cross a dimension line with an
extension line, and avoid crossingdimensions with leader lines.
12. Do not cross a dimension line with an
extension line, and avoid crossing
dimensions with leader lines.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 12
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
13. Dimension numbers should be centered
between arrowheads, except when usingstacked dimensions, and then the numbers
should be staggered.
Incorrect
13. Dimension numbers should be centered
between arrowheads, except when using
stacked dimensions, and then the numbers
should be staggered.
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Dimension Guidelines
Project Lead The Way, Inc.
Copyright 2007 13
Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
14. Concentric circles are dimensioned in the
longitudinal view, whenever practical.
Incorrect
14. Concentric circles are dimensioned in the
longitudinal view, whenever practical.
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Dimension Guidelines Introduction to Engineering Design TM
Unit 2 – Lesson 2.2 – Dimensions and Tolerances
Multiple
extension
line
crossings
may be
confused for
the outside
corner of the
part.
15. Avoid crossing extension lines, but do not
break them when they do cross.
16. Leader lines point toward the center of the
feature, and should not occur horizontally
or vertically.
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