1. Input/Output functional model
Images for class on machine functional analysis
topics: functional decomposition and decomposition
into major subsystems mrc
Input/Output functional model
Source: K.L. Wood and K.N. Otto, Product Design: Functional Modeling (preprint) p. 5-17

2. Nail clippers
Source: K.L. Wood and K.N. Otto, Product Design: Functional Modeling (preprint) p. 5-18

3. Clippers in detail
Source: K.L. Wood and K.N. Otto, Product Design: Functional Modeling (preprint) p. 5-28

4. Nail gun
Ulrich and Eppinger Product Design and Development McGraw Hill 1995, p. 83

5. A coffee grinder
Source: K.L. Wood and K.N. Otto, Product Design: Functional Modeling (preprint) p. 5-15

6. Weight-driven automatic file cutter
hammer down
hammer up

7. Try your hand at a decomposition for the file cutter

8. Efficiency = output/input -- a quick way to check the reasonableness of a design
input power
Crank-driven machine for cutting files
output power
loss (heat)
input power
output power
Crank or rope to shaft
lantern gear to peg gear
Output screw to file slider
loss
loss
loss