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alignment chart angle assembly drawing auxiliary view axes axis axonometric projection basic center line circle computer-aided design cone construction cutting plane cylinder DESCRIPTIVE GEOMETRY determine diagram diameter dimension lines dimetric projection distance drafting draftsman drawn edge view elements ellipse engineering equation F-view finished force front view frontal generatrix given line graph graphical hole illustrated in Fig inch inclined integral curve isometric isometric projection letters line of intersection machine method multiview necessary object oblique oblique projection orthographic parallel pencil perpendicular perspective pictorial drawing picture plane piercing point plane ABC plane of projection position practice principal view problems projecting plane radius reference line represent representation revolved scale screw Screw Threads shaft shown in Fig side view sketch skew lines space specified Standard Step straight line symbols tangent thread tolerance top view triangle true length vector vertical WARPED SURFACES weld width