01Understand
Define the problem before drawing the part.
Requirements, operating conditions, constraints, target cost and production volume are captured first. What the product must do sets the design envelope.
- Requirements brief
- Design envelope
- Constraints list
Stage image: A monitor showing the gear reducer’s design envelope in CAD, a translucent box of 320 by 210 by 180 millimetres around the concept, above a printed requirement sheet listing input torque, power and ratio.

