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Orthographic Writing

Orthographic Writing. View Selection. VIEW SELECTION STEPS. 1. Orient the object to the best position relative to a glass box. 2. Select the front view. 3. Select adjacent views. The object should be placed in its natural position.

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Orthographic Writing

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  1. Orthographic Writing

  2. View Selection

  3. VIEW SELECTION STEPS 1. Orient the object to the best positionrelative to a glass box. 2. Select the front view. 3. Select adjacent views.

  4. The object should be placed in its natural position. The object should presents its features in actualsize and shape in orthographic views. STEP 1 : Orient the Object GOOD NO !

  5. The object’s longest dimension should be presented as a width. STEP 2 : Select a Front View First choice Second choice Waste more space Inappropriate GOOD

  6. The adjacent views that are projected from the selected front view should appear in its natural position. STEP 2 : Select a Front View Inappropriate

  7. Choose the view that have the fewest number ofhidden lines. STEP 2 : Select a Front View GOOD Inappropriate

  8. Choose the view that have the fewest number ofhidden lines. STEP 3 : Select an Adjacent View GOOD Inappropriate GOOD Inappropriate

  9. Choose the minimum number of views that can represent the major features of the object. STEP 3 : Select an Adjacent View Necessary Hole’s location can be specified on the same view. Easy to understand Difficult to interprete. Necessary

  10. Choose the views that are suitable to a drawingspace. STEP 3 : Select an Adjacent View POOR Not enough space for dimensioning.

  11. Choose the views that are suitable to a drawingspace. STEP 3 : Select an Adjacent View GOOD

  12. D W H D W H Example: View selection mislead to… F.V. Three views F.V. & T.V. F.V. & R.S.V.    Size description    Shape description

  13. Flat part having a uniform thickness. ONE-VIEW DRAWING 1 Thick These 2 views provide only informationabout the part thickness ! Unnecessary

  14. Cylindrical-shaped part. ONE-VIEW DRAWING Unnecessary Repeat ! Infer from CL Unnecessary

  15. There exists an identical view. TWO-VIEW DRAWING Repeat ! Unnecessary

  16. The 3rd view has no significant contours of the object. TWO-VIEW DRAWING Unnecessary

  17. The 3rd view has no significant contours of the object. TWO-VIEW DRAWING Unnecessary

  18. Thank you

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