Reading a detail drawing – views, sections and dimensions
Design & TechnologyEngineering Drawing & DesignAges 15–16
Use it with your class: students open it from a link or a QR code, with no account needed.
Next in Engineering Drawing & Design
A rotational part (bushing, stepped shaft, spacer bush or V-belt pulley) is shown at the same time as a 3D solid and as a detail drawing with a front view, a side view and the dimensions ⌀D, ⌀d, L. Students change the three dimensions and watch both the 3D solid and the drawing update, drag on the solid to rotate the viewing axis, and turn on the sectional view to see the bore drawn with a solid line and the cut material hatched at 45° — turning it off returns the bore to a dashed line.
Lesson: Detail drawings: views, sections, dimensioning and the reading procedure
What it shows
Engineers describe parts with orthographic views rather than pictures. The simulation places a 3D solid beside its detail drawing, with a front view, a side view and the dimensions ⌀D, ⌀d and L, so students can link each line on paper to a feature of the real part. Hidden features such as a bore are drawn with dashed lines. A section through the axis replaces those dashed lines with bold solid outlines and hatches the cut material at 45°, which is why sections are preferred for parts with internal detail.
How to use
Choose a Part, then change the Outer diameter ⌀D, Bore diameter ⌀d and Length L and check that the solid and the dimension figures on the drawing update together. Drag on the solid to rotate it, or use Auto-rotate and Standard view, and match each face with its view. Switch between Show section and Hide section to compare how the bore is drawn. Finish by reading the drawing in order: title block, views, dimensions, technical requirements.
Parameters you can change
- Part Bushing, Stepped shaft, Spacer bush, V-belt pulley
- Outer diameter ⌀D 30–90 mm
- Bore diameter ⌀d 10–60 mm
- Length L 20–100 mm
- Show sectional view (with hatching)
Questions to explore
- In the front view without a section, which type of line shows the bore, and why?
- When the section is shown, which regions of the part are hatched and which are left blank?
- For the Bushing, how does the wall thickness (D − d)/2 change when you increase ⌀d and keep ⌀D fixed?
