Transcription of Engineering Drawings: Sectioning - University of Sydney
1 Engineering Drawings: SectioningA short series of lectures on Engineering Drawing as Part of ENGG1960By Paul BriozzoSectioning Features that cannot be seen by hidden detail Cutting plane removes part section is what is left Cross hatching is at 45oequispaced Centrelines often used for cutting planes Very thin sections not hatched gaskets, seals Do not show hidden detail in sectional view (except for special features) Webs, Shafts, bolts and pins are usually NOT sectioned even if they are in the cutting planeRules to Remember When Sectioning A sectional view shows the part of the component in front of the cutting plane arrows.
2 In third angle projection the sectional view is placed on the side behind the Sectioning viewing plane. Material which has been cut by the cutting plane is hatched. Standard exceptions are noted previously. A sectional view must not have any full lines drawn over hatched areas. As a general rule, dimensions are NOT inserted in hatched areas.
