04-BS-15 · December 2014
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Reference texts: Bertoline & Wiebe, Technical Graphics Communication; Giesecke, Mitchell, Spencer et al., Technical Drawing / Engineering Graphics (ASME Y14.5 dimensioning practice, CSA B78.1 Canadian drafting conventions).
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.
[Figure not reproduced: Given isometric pictorial: curved hook bracket on a stepped block and circular base. See the official exam paper or the cited reference text.]
The bracket has internal features — a hollow curved hook arm, a bore through the mounting block, and a stepped hole down through the circular base — that cannot be shown clearly with hidden (dashed) lines alone. A full section view, cut by a vertical plane through the part's centreline, replaces the hidden lines with solid section-lined (hatched) material and reveals the true internal shape.
Approach. Choose the cutting plane along the vertical centreline (the plane that passes through the hook's hollow, the mounting bore, and the base counterbore), remove the near half conceptually, and draw what remains: the outer profile stays a normal visible outline, but every surface actually cut by the plane is section-lined at 45°, while features behind the cutting plane (not cut) revert to ordinary hidden or visible lines as appropriate — the standard convention of NOT hatching ribs/webs is not needed here since there is no thin web aligned with the cut.
| Item | Result |
|---|---|
| View selected | front view, full section (cutting plane A-A on the vertical centreline) |
| Section-lined surfaces | hook-arm wall, mounting-block bore wall, base counterbore wall |
| Hatch angle | 45°, uniform spacing, same angle for all pieces of one part |
