Altering component materials (e.g., switching from metal to plastic).Examples of changes that trigger a new part number include, but aren’t limited to: Overall, a new part number needs to be created if the physical part or component changes. Function: How the part is designed to perform within the assembly.Īpplying these definitions, engineering teams can make clear and confident decisions about whether to create a new part number or implement a revision.Fit: The part’s ability of the part to interface with, connect to, or join with other features of the assembly.Form: The part’s dimensions, shape, weight, size material, and visual appearance.To prevent any confusion, the F3 rule defines each word as follows: Form, Fit, and Functionįorm, fit, and function are subjective terms. If none of those aspects are affected, a revision will suffice. ![]() ![]() Disagreements can – and often do – occur, which makes the Form, Fit, and Function (F3) rule just that much more valuable.Ī widely accepted best practice, the (F3) rule dictates that if a product’s form, fit, or function is affected by design or engineering change(s), a new part number should be created. What’s not constant, however, is the way that organizations agree to manage the changes internally. Dealing with design and engineering changes will always be part of the job for manufacturers due to constant innovation and changing consumer needs.
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