2.3 Plain Scale Drawing

• Importance of drawing figures to scale
• Features of a plain scale used in drawing
• Construction of a plain scale
• Reading a plain scale
• Drawing plane figures to a given plain scale

• describe the features of a plain scale used in drawing
• interpret a plain scale used in drawing
• draw plane figures to a given scale
• appreciate the use of plain scale drawing in the work environment

“What is the importance of drawing figures to scale?”

“How are plane figures drawn to scale?”

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1. Why we draw figures to scale
   40 min · 1 practice tasks · quiz
   The importance of scale: full size, reduced and enlarged drawings so objects keep proportion on a sheet a person can hold.
2. Features of a plain scale
   40 min · 1 practice tasks · quiz
   The parts of a plain scale: RF, units, primary divisions, subdivided first unit, and zero placed after that unit.
3. Constructing a plain scale
   40 min · 1 practice tasks · quiz
   Working out the paper length from RF and maximum object length, then drawing, dividing and subdividing a plain scale with instruments.
4. Reading a plain scale
   40 min · 1 practice tasks · quiz
   Interpreting a plain scale: wholes to the right of zero, leftover subdivision to the left, then taking that length with dividers.
5. Drawing plane figures to scale
   40 min · 1 practice tasks · quiz
   How to draw a rectangle or simple combined plane figure using a given plain scale, keeping angles, writing actual sizes, and noting the RF on the title block.
6. Scale drawing in the work environment
   40 min · 1 practice tasks · quiz
   Appreciating plain-scale drawing in carpentry, metalwork and patterns, with a simple workplace figure to scale and a recap of features, reading and construction.