Input/Output functional model Images for class on machine functional analysis topics: functional decomposition and decomposition into major subsystems 02-08-2005 -mrc Input/Output functional model Source: K.L. Wood and K.N. Otto, Product Design: Functional Modeling 08-04-98 (preprint) p. 5-17

Nail clippers Source: K.L. Wood and K.N. Otto, Product Design: Functional Modeling 08-04-98 (preprint) p. 5-18

Clippers in detail Source: K.L. Wood and K.N. Otto, Product Design: Functional Modeling 08-04-98 (preprint) p. 5-28

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

A coffee grinder Source: K.L. Wood and K.N. Otto, Product Design: Functional Modeling 08-04-98 (preprint) p. 5-15

Weight-driven automatic file cutter http://www.digital-archaeology.com/3D-Animation-DynamicalSystems.htm hammer down hammer up http://brunelleschi.imss.fi.it

Try your hand at a decomposition for the file cutter

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