technical drawing - 2

8/10/2019 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

MEC1000 Technical Drawing - D. Anderson


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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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TITLE BLOCK

technical drawing - 2

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