dr. soleh 013515104x_pp9a dimensioning 23.9.13
TRANSCRIPT
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Dimensioning
Chapter 9
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Objectives
Use conventional dimensioningtechniques to describe size and shapeaccurately on an engineering drawing
Create and read a drawing at aspecified scale
Correctly place dimension lines,extension lines, angles, and notes
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Aspects of Good Dimensioning
Dimensions are given in the form of distances, angles, and notes regardless
of the dimensioning units being used The ability to create good dimensions
requires:
Technique of dimensioning Placement of dimensions Choice of dimensions
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Lines Used in Dimensioning
Dimension line a thin, dark, solid lineterminated by arrowheads, indicatingthe direction and extent of a dimension
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Lines Used in Dimensioning
Extension line a thin, dark, solid linethat extends from a point on thedrawing to which a dimension refers
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Lines Used in Dimensioning
Centerline athin, dark line
alternating longand short dashescommonly used inlocating holes andother symmetricalfeatures
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Using Dimension and
Extension Lines
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Using Dimension and
Extension Lines Dimensions should be lined up and
grouped together as much as possible
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Arrowheads
Arrowheads indicate the extent of dimensions
They should be uniform in size andstyle throughout the drawing
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Leaders
A leader is a thin solid line directingattention to a note or dimension andstarting with an arrowhead or dot
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimension Units
Dimension values are shown using themetric system or decimal inch values
It is standard practice to omit millimeterdesignations and inch marks ondrawings and note the units in the titleblock except when there is a possibilityof misunderstanding
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Placing Dimensions
Never letter a dimension value over anyline on the drawing
In a group of parallel dimension lines,the dimension values should bestaggered
Do not crowd dimension figures intolimited spaces making them illegible
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Placing Dimensions
Place dimensions between views whenpossible, but only attached to a singleview
Dimensions should not be placed on aview unless doing so promotes theclarity of the drawing
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Placing Dimensions
When a dimension must be placed in ahatched area or on the view, leave anopening in the hatching or a break inthe lines for the dimension value
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Placing Dimensions
Avoid dimensioning to hidden lines Do not attach dimensions to visible lines
where the meaning is not clear Notes for holes are usually placed
where you see the circular shape of the
hole An external cylindrical shape is
dimensioned where it appears rectangular
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Placing Dimensions
Give dimensions where the contours of the object are defined
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Superfluous Dimensions
All necessary dimensions must beshown but avoid giving unnecessarydimensions
Do not repeat dimensions on the sameview or on different views, or give the
same information two different ways
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimensioning Angles
You should dimension angles byspecifying the angle in degrees and alinear dimension
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimensioning Arcs
A circular arc is dimensioned in the viewwhere you see its true shape by givingthe value for its radius preceded by theabbreviation R
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Fillets and Rounds
Individual fillets and rounds aredimensioned like other arcs
If there are only a few and they areobviously the same size, giving one typicalradius is preferred
Fillets radii can also be given in a generalnote
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Size Dimensions: Cylinders
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Size Dimensions: Holes
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimensioning Various Shapes
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimensioning Curves
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimensioning Curved Surfaces
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimensioning Rounded-end
Shapes
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimensioning Threads
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimensioning Tapers
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Dimensioning Chamfers
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Shaft Centers
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Finish Marks
A finish mark is used to indicate that asurface is to be machined
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Surface Roughness
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Location Dimensions
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Location Dimensions
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Modern Graphics Communications 4 th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Location Dimensions
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Modern Graphics Communications 4 th Edition 2010 Pearson Education Upper Saddle River NJ 07458
Location Dimensions