Design for Assembly - DFA - index

Design for Assembly Index

The Design for Assembly - DFA - index can be expressed as:

DFA = 100 Nm tm / ta    (1)


DFA = Design for Assembly Index

Nm = theoretical minimum number of parts

tm = minimum assembly time per part (s)

ta = estimated total assembly time (s)

Example - Assembling a Component

A component requires 200 seconds assembling. With some modifications the number of parts can be reduced to 6 - with minimum assembly time per part 3 seconds.

The DFA index can be calculated 

DFA = 100 5 (3 s) / (200 s) 

      = 7.5    

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