Other companies just simply do not worry about it? I know the change details could potentially save us a lot of head-scratching down the road. Where would I put the details about what has changed? Would I just fill in the revision block as a rev 0? (we use numerical revision designations, not letters). So now I have a new part number for basically an "old" part that has a lot of history. Therefore in accordance with our Technical Data System it must get a new number. It has now been significantly revised in such a way that the form, fit & function have changed. I have a part that has been used for long time. Various real-life scenarios exist where following the rules are not always possible but the Form, Fit and Function (FFF) methodology provides a basic robust concept whenever possible.I encountered an issue today and I'm wondering how other places handle this. Any new revision must be compatible with all of its previous revision.For example a change to improve manufacturability or correcting a defect would probably warrant a revision.If the proposed changes do not affect Form, Fit or Function, then it is typically sufficient to revise that component where the Part Number would not change.New Part Numbers should also be assigned to higher up assemblies up to the point where interchangeability is re-established. This may be an evolution or derivation of an existing component but should use a new Part Number. If Form, Fit or Function is affected by the proposed change of the component then the component is not interchangeable therefore a new component should be created.
Create a new component with a new Part Number:.
Based on the consideration relative to FFF, the engineer can: When an engineer assesses the proposed change of a component, they should consider how the change will affect the component.
- Function refers to the action or actions that an object has been designed to perform.
- This also includes tolerances modifications.
- Fit is the ability of an item to physically interface with all other components.
- Sometimes weight, balance and centre of mass are considerations in ‘form.’
This defines the “look” of the part or item.
- Form is the shape, size, dimensions, mass or other visual parameters which uniquely characterise an item.
- In order to determine whether to create a new part number or revise before any modification, the Engineer should consider the Form, Fit and Functional (FFF) requirements: This methodology concerns both design and BOM components. During the design process, Engineers regularly have to decide on whether a new part or change meets the Form, Fit and Functional requirements.