Constructing a Scale Drawing, Including Choosing a Scale

Constructing a Scale Drawing, Including Choosing a Scale

Understanding Scale Drawings

Definition of Scale Drawings

  • Know that a scale drawing is a representation that maintains the proportions of the original object, but changes its size.
  • A scale drawing can be larger or smaller than the object it represents and maintains the original’s shape and proportions.
  • Be aware, map drawing, architectural design, engineering schematics, and robotics designs frequently use scale drawings.

Role of Scales

  • Recognise that the scale is the ratio of the size of the drawing to the size of the real object.
  • Understand that scales are usually given in the form 1 : n or 1/n, where ‘1’ represents a unit length on the drawing, and ‘n’ is the corresponding length on the original object.
  • Note that a larger n creates a smaller drawing and vice versa.

Constructing Scale Drawings

Choosing a Scale

  • Understand that the first step in constructing a scale drawing is to choose a scale.
  • The chosen scale must make the drawing small enough to fit onto your paper, yet large enough to show sufficient detail.
  • Consider physical constraints and the level of detail required to determine scale for the drawing.
  • Be aware that if scales aren’t consistent, it can lead to misrepresentation and inaccuracies.

Calculation

  • Be precise in your calculations when converting from the actual size to your chosen scale.
  • Remember to maintain proportions. Each dimension of the object must be multiplied by the same scale factor.
  • Keep in mind that when the scale factor is less than 1, the drawing becomes smaller and when it is more than 1, the drawing becomes larger.

Drawing

  • Always use a ruler or another precise tool for creating drawings. Freehand drawings should be avoided.
  • Confirm that your lines are straight and your angles are accurate.
  • Be consistent in using your scale throughout your drawing to ensure accuracy.

Checking and Correcting Errors

  • Double-check your measurements and calculations.
  • Verify that the scale used is appropriately communicated, and the drawing accurately represents the original in proper proportion.
  • Be sure to label all parts of your drawing properly, including dimensions.
  • Watch out for common mistakes, such as confusing the scale, not maintaining proportions across the entire drawing or misreading measurements.