Question

Construct an isometric scale.

Hint:

Always use an isometric scale when asked to draw an isometric projection, not when drawing isometric view (which uses true length).

Answer 1

An isometric scale is used to measure true lengths along the isometric axes when drawing isometric projections. It helps in converting true lengths into isometric lengths, which are approximately 82% of the original lengths.
Steps to construct an isometric scale:
1. Draw a horizontal line and mark it as the true length line.
2. From the left end of this line, draw a line inclined at 45° — this line will represent true lengths.
3. From the same point, draw another line inclined at 30° — this will represent isometric lengths.
4. Mark regular intervals (e.g., 10 mm, 20 mm, 30 mm, etc.) on the 45° line.
5. From these marks, draw vertical lines to meet the 30° line.
6. The distances measured along the 30° line represent the isometric lengths.
Use: This scale is then used in isometric drawings to measure and draw isometric projections accurately.