MEC 1011 - Design Communication I
the end of our ‘Lecture’ meeting in Week 3
All items drawn with pencil on 8 ½ x 11 paper
- Produce a concept sketch of a simple assembly
(like a zero-g doughnut holder). Sketch freehand using any combination of
orthographic or isometric views. Consider using an exploded isometric view
as in Figure 3.47. Your design should include at least two custom parts
(meaning you can’t buy them through a catalog) and at least one
standard fastener. Further, your design must demonstrate a clearance fit
and an interference fit (see page 518). Include general and specific
notes. Also include a title at the top, some reference to size, material,
how it will work and how it will be made. Sign and date it. Here’s an example that meets most of the above requirements.
Here’s a concept sketch from last
fall’s electromechanical senior projects.
- Produce a complete part drawing for each
custom part in your assembly. Use rectangular graph paper and include the
necessary views (at the maximum convenient scale), projection lines
(lightly), a ‘fold line’ (refer to lecture notes), dimensions
(see rules in Figure 12.48), tolerances, title block (see Figure 12.35),
border, and pertinent notes.
- Produce a complete assembly drawing. Use
isometric graph paper to construct an exploded isometric view (like Figure
12.7) at the maximum convenient scale. Include balloons (alias ‘ball
tags’ or ‘bubble numbers’) as in Figure 12.5. Include a
parts list like Figure 12.9, a title block and a border.
1. Keep it simple!
To determine the maximum convenient scale, lay out a plan for your
view(s) as though your object(s) was a simple rectangular block (see Figure
3.17 for iso or Figure 4.27 for ortho). You might even consider sketching a
rough draft of each drawing to make sure you have accounted for dimensions etc.
Consider identifying a
supplier for your standard fastener. This can assist you by giving you
tolerances to design with. For example, a typical ground steel dowel pin has a
diameter tolerance of +0.0002 – 0.0000.