Boeing 81205 Manual

A SERVICE OF

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First Edition Dated September, 2000 48

No tool - Tight tolerances

Assembly ABC

Assembly ABC

Key

Part B

Part C

A

Part A

4.5.5_1

Part B

A

+.010

Part C

+.010

A

+.010

A

Part A

+.030

Figure 4.5.5_1 depicts the manufacturing trend to shift from part-to-tool

manufacturing to part-to-part manufacturing in order to save the non-recurring

and recurring costs of tooling. However, this approach requires tighter

tolerances and higher detail costs. In the example above, the part profile may

be stamped sheet metal, but the holes are put in using a more expensive

process to hold the tighter tolerances. There are multiple ways to

manufacture these details, but depending on the specific situation, the part

fabrication costs may exceed the benefit of eliminating the traditional

assembly tooling.