Unit 1ProjectionsHARD
Rabatment of a Plane
A triangular plane has traces VT = 60mm and HT = 80mm. The plane makes 45° with HP. Draw the plane in its inclined position and show its rabatment (rotation) on HP to show true shape.
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Solution Diagram
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Step-by-Step Construction
- 1
Draw VT (60mm) perpendicular to XY and HT (80mm) along XY
- 2
The angle at intersection gives plane's inclination (45°)
- 3
For rabatment, rotate plane about HT until it coincides with HP
- 4
Every point on plane moves in arc perpendicular to HT
- 5
VT rotates to V'T position in HP
- 6
Distance of V'T from HT = VT / sin(45°)
- 7
Draw true shape of any figure in this rabatted position
Pro Tips
- •Always verify your measurements with a scale before finalizing the drawing
- •Use construction lines lightly and darken the final solution
- •Label all important points and reference lines clearly