Question 2 of 10: Orthographic Projection from an Isometric Assembly

Question 2: Orthographic Projection from an Isometric Assembly (36 marks)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

The four pictorials together describe a cylindrical clevis-type bracket: one end is a solid cylindrical boss pierced by a single transverse through-hole (the “eye”), the body steps down in diameter, and the far end opens into a rectangular yoke block with a larger transverse bore. Because the part is a body of revolution at each end, joined by a stepped cylindrical shank, the minimum view set is a front view (true shape of the yoke block and the step diameters) plus a right-side view (true circular shape of the eye and the bore, and the true diameter steps) — a top view would only repeat the same circular profile already shown true-size in the side view, so it is correctly omitted. Since the pictorials are drawn at double the part's actual size, the orthographic answer is sketched at the same size as the given pictorials, i.e. also 2:1.

Approach. Sight along the shank axis for the side view (shows the true circular outline of the eye-hole and the yoke bore, both drawn with centre-marks), then sight perpendicular to the axis for the front view (shows the true step lengths/diameters and the yoke block's true rectangular outline); every internal bore is hidden behind solid material from the front, so it is drawn dashed there.