S ECTION V IEWS What is a section view? See inside an object. Why section view? Complex interior geometry. clarify the interior construction Cant clearly described by hidden lines S ECTIONAL V IEWS The idea is Make an imaginary cut Removing a portion Inside is seen more clearly. S ECTIONAL V IEWS What is this? An ugly rock? S ECTIONAL V IEWS A pretty rock? C REATING A S ECTION V IEW The part is cut using an imaginary cutting plane. C REATING A S ECTION V IEW The unwanted portion is mentally discarded exposing the interior construction. S ECTION E XAMPLE Notice how the cutting plane is indicated. Notice how the cut material is shown. Sectional view label L INES U SED IN S ECTION V IEWS Cutting Plane Line: Used to show where the object is being cut. C ONT Shows where the part is being cut. Arrows point to the portion being kept. Section Lines (hatch) C ONT Section Lines (cross hatch): Indicate where the cutting plane cuts the material. Section lines are thin lines. Section line symbols are chosen according to the material of the object Section lines are generally drawn at a 45 angle. L INES U SED IN S ECTION V IEWS Common Cross Hatch Symbols R ULES OF S ECTIONING Rule 1: A section lined (hatched) area is always completely bounded by a visible outline. R ULES OF S ECTIONING Rule 2: The section lines (hatch) in all areas should be parallel. R ULES OF S ECTIONING Rule 3: All the visible edges behind the cutting plane should be shown. R ULES OF S ECTIONING Rule 4: Hidden features should be omitted in all areas of a section view. R IB AND W EB S ECTIONS To avoid a false impression of thickness and solidity, ribs and webs are not sectioned. No section lines in cut area of web 17 R IB AND W EB S ECTIONS If the cutting plane passes crosswise through the rib or web, we include section lines. Cutting plane passes through the web Section lines in cut area of web T YPES OF SECTIONS 1.Full Section 2.Half Section 3.Offset Section 4.Broken-Out Section 5.Revolved Section 6.Removed Section 19 F ULL S ECTION 20 H ALF S ECTION 21 22 O FFSET S ECTION 23 24 B ROKEN -O UT S ECTION 25 R EVOLVED S ECTION & R EMOVED S ECTION 26 27 28 R D X A A 35 20 R R 18 R 43 A A 44 45 A A 46 A 47 48 52 A A 54 57 58 59 60 61 A A R 10 R 64 65 66 67