1. The document provides guidance on creating working drawings and materials lists for prototyping designs, including types of drawings needed and how to construct them. 2. It describes how to make isometric drawings, orthographic part drawings, exploded views, and materials lists with relevant dimensions, part numbers, materials, and quantities. 3. Instructions are given for including details, symbols, and views in the different types of technical drawings to fully communicate a product design.

1. Working Drawings & Materials list

2. At the end of the lesson,
• Pupils will be able to apply the concept of basic drawing techniques
to communicate details for prototyping and the proposed design
solutions

3. Types of working drawings you need in your
journal after development
1. Isometric drawing of the product
2. Part drawings (1st angle Orthographic drawing)
3. Exploded view (optional)
4. Sectional drawing (optional)

4. Isometric drawing
• Isometric drawing is a quick and simple way to show an
object in pictorial form.
• In an isometric drawing:
• Vertical lines on the object appear as vertical
lines in the drawing;
• Horizontal lines on the object are drawn 30° to
the horizontal; and
• Measurements along the isometric axis are the true
measurements of the object (or are scaled by equal
amounts).

5. Isometric drawing

6. Isometric drawing
• A bounding box just large enough to contain the object is
first constructed in isometric drawings.

7. Isometric drawing
• In isometric projection, a circle appears as an
ellipse.
• An ellipse can be sketched by drawing the isometric
square into which it fits, and then marking out the
centre points of each circle.

8. Part drawings
• Provides detailed views of the product using orthographic projections.
• Views include all measurements in mm needed to make a product
• Correct symbols to be used
Ø for diameter, R – radius
• The right type of line convention should be used.

9. Part drawings
Points to take note:
1. Indicate dimensions of the parts clearly (in mm)
2. Indicate part number and description clearly for each
part.
3. Part number and description should be consistent
throughout.
4. Show at most two views of the product in part
drawings. (plan view plus either side or front
view)

10. Part drawings
• Hidden detail shows the inside details of an object from the
outside, using thin dashed lines.

11. Part drawings
• A sectional view is a drawing that shows the
inside of an object, as if part of it had been cut
with a knife and removed.
• Sectional views are usually shown in
orthographic projection drawings.

12. Exploded view
• Exploded views are used to show how parts fit together.
• These are normally pictorial drawings but some are shown
in orthographic projection.

13. Exploded view
• Steps to construct an exploded view:

14. Exploded view
• Steps to construct an exploded view:

15. Exploded view

16. Materials list
Materials list provides details of materials, sizes and number of parts
used in the product.
Example of a Materials list
Part no. Description Dimension (mm) Material Colour Quantity
1. Side cover 210 x 200 x 3 Acrylic Opaque
yellow
2
Part number must be the same as in part drawing
Indicate whether it is opaque or transparent

17. Materials list

18. Production Schedule (optional)
• Production schedule shows the stages of production on a single chart. It
includes all the tasks and a timeline.
• It provides a way of checking and monitoring the progress of production.

19. Production Schedule (optional)