Technical Drawing - 2
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Transcript of Technical Drawing - 2
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TECHNICAL DRAWINGDRAWING STANDARDS - 2
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DRAWING STANDARDS DIMENSIONS
There exist a number of dimension type :
Linear
Coordinate dimensions
Coordinate without dimension line
(ordinate)
Angular
Radial/Diametrical
Tabular Dimension placement
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DRAWING STANDARDS COORDINATE
Are these 2 drawings the same ?
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DRAWING STANDARDS ORDINATE
Are these 2 drawings the same ?
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DRAWING STANDARDS PROPER DIMENSION
PLACEMENT
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DRAWING STANDARDS PROPER DIMENSION
PLACEMENT
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DRAWING STANDARDS BOLT HOLES
Poor practice, dims should all
be horizontal
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DRAWING STANDARDS HOLE TABLES
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DRAWING STANDARDS HOLE CALLOUTS
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DRAWING STANDARDS THREADED HOLE
CALLOUTS
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DRAWING STANDARDS MISC CALLOUTS
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DRAWING STANDARDS DIMENSIONARROW
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DRAWING STANDARDS DIMENSIONING BEST
PRACTICES
1. All CAPS2. All decimals
3. Select a front view that best describes the part
4. Remove hidden lines always, unless absolutely necessary
5. Do not duplicate dimensions, use reference dims if necessary to
duplicate
6. Do not dimension to hidden lines7. Place dimension between views if possible
8. No dims allowed on body of part. Offset 0.38 inch from object line
9. Place all dims for same feature in one view if possible
10. Dim lines cannot cross dim lines
11. Dim lines should not cross extension lines
12. Extension lines can cross extension lines13. Use center marks in view(s) only when feature is dimensioned only
14. Use centerlines in view(s) only if feature is being dimensioned or
referenced otherwise omit
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DRAWING STANDARDS DIMENSIONING BEST
PRACTICES
15.When multiple of the same feature exists in a view, dimension only oneof the features and label the dim as NumberX Dim meaning that the
feature exist in that view Number times. For example, 4X0,250
implies that in the view, there exist 4 like dimensions for the
dimensioned feature.
16.Minimize use of centerlines between holes etc, they add little value and
clutter the object being drawn.
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DRAWING STANDARDS HATCHING
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DRAWING STANDARDS HATCHING
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TUGAS
90 90 90 90
90
90
8
88
5
8 8 8 8
55
5
27
53
27
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