Graphics – AS1100 standards, assembly drawings and thread representation

Engineering Studies – H1 Civil Engineering – Graphics

This topic covers orthogonal drawing techniques and drawing standard. Particular attention is given to examples of dimensioned assembly drawings and methods of representing threads and threaded components.

Key Concepts

Orthogonals

• The purpose of assembly drawings
• The types of assembly drawings
• Visualizing the shape and proportions of an object when viewing assembly drawings
• The ability to make a freehand sketch of an object using a pictorial to accurate scaled size and dimension
• Apply AS1100 drawing standards

Threads

• The AS1100 rules that apply with screw thread representation
• Representing a threaded rod/bolt
• Representing a threaded hole/nut
• Sectioning threaded components

Discussion Questions

Orthogonals

1. Describe the purpose of an assembly drawing.
2. Name examples of where assembly drawings are likely to be used.
3. Can assembly drawings be either orthogonal or pictorial?
4. Do the rules of projection apply with assembly drawings?

Threads

1. Why are threads represented rather than drawn exactly as they appear?
2. Discuss the use of ‘line types’ to represent features of a V thread
3. Discuss terms used for parts of a thread:
   • thread depth
   • pitch
   • V and Square
   • M for Metric
4. How is the length of a bolt determined?
5. How is a hexagon drawn?
6. What is measured to determine the diameter of a bolt?
7. What size are washers?
8. What is a run-out?
9. What s a tap and die?
10. How is a thread correctly labelled using AS1100 standards?
11. Do you section threaded parts?