The angles between the three principal axes are equal to 120 degrees and are equally foreshortened.
To draw the isometric projection, you need isometric scale to measure the foreshortened length of the object.
Construction of Isometric Scale
• Draw a horizontal line, say AB
• Draw the true length of line C, at an angle 45° to the line AB
• Let us consider true length of line be 50 mm
• Draw a line AD at 30° to the line AB
• Draw the vertical projection of all the points from AC to AD
• Complete the scale
• The length shown on the line is called as the isometric scale
• Isometric scale is used to draw the isometric projection
To draw the isometric projection, you need isometric scale to measure the foreshortened length of the object.
Construction of Isometric Scale
• Draw a horizontal line, say AB
• Draw the true length of line C, at an angle 45° to the line AB
• Let us consider true length of line be 50 mm
• Draw a line AD at 30° to the line AB
• Draw the vertical projection of all the points from AC to AD
• Complete the scale
• The length shown on the line is called as the isometric scale
• Isometric scale is used to draw the isometric projection
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