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# SECTIONING IN ENGG DRAWING

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• Instructor:
Go through the list with your students and see if there is something missing. Springs are another item that are not normally sectioned. This would come out of their reading.
• ### SECTIONING IN ENGG DRAWING

1. 1. SECTIONING
2. 2.      Sections are used to show interior details clearly. A cutting-plane line shows where object was cut to obtain the section view. Cross hatching in the section view shows the solid surface of the object which were cut through to produce the section. Conventional practices, such as not showing hatching on ribs and webs, help make sections easier to interpret correctly. Sections help in reducing or eliminating the hidden lines.
3. 3. CUTTING PLANE Cutting plane is a plane that imaginarily cuts the object to reveal the internal features. Cutting plane Cutting plane line Section lines
4. 4. SECTION LINES SYMBOLS The section lines are different for each of material’s type. For practical purpose, the cast iron symbol is used most often for any materials. Cast iron, Malleable iron Steel Concrete Sand Wood
5. 5.  Not Sectioned – show all exterior features for:          Shafts Bearings, roller or ball Gear Teeth Threaded Fasteners, Nuts and Bolts Rivets Ribs Washers Keys and Pins Springs
6. 6. 1. Full section 2. Offset section 3. Half section 4. Broken-out section 5. Revolved section (aligned section) 6. Removed section (detailed section)
7. 7. The view is made by passing the straight cutting plane completely through the part.
8. 8. The view is made by passing the bended cutting plane completely through the part. Do not show the edge views of the cutting plane.
9. 9. The view is made by passing the cutting plane halfway through an object and remove a quarter of it.
10. 10. HALF SECTION VIEW A center line is used to separate the sectioned half from the unsectioned half of the view. Hidden line is omitted in unsection half of the view.
11. 11. BROKEN-OUT SECTION VIEW The view is made by passing the cutting plane normal to the viewing direction and removing the portion of an object in front of it.
12. 12. BROKEN-OUT SECTION VIEW A break line is used to separate the sectioned portion from the unsectioned portion of the view. Break line is a thin continuous line and is drawn freehand. There is no cutting plane line.
13. 13. REVOLVED SECTION VIEW Revolved sections show cross-sectional features of a part. No need for additional orthographic views. This section is especially helpful when a cross-section varies.
14. 14. REVOLVED SECTION VIEW Basic concept
15. 15. REVOLVED SECTION VIEW Basic concept
16. 16. REVOLVED SECTION VIEW Placement of revolved section 1. Superimposed to orthographic view. 2. Break from orthographic view. Break Superimposed
17. 17. REMOVED SECTION VIEW Removed section is revolved section. Section view is shown outside the view. Used where space does not enough for revolved section Can be located elsewhere on a drawing with properly labeled
18. 18. REMOVED SECTION VIEW Example : Revolved vs. removed sections. Revolved section Removed section