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Chapter 8 Design for Producibility

Producibility
by

Andrew LeRoy

on 13 November 2012

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Transcript of Chapter 8 Design for Producibility

Design for Producibility Chapter 8 Dual Media Player Chapter 8 Design For Producibility The efficiency with which materials can be processed in order to create a product Producibility No matter how elegant a product is or how well it functions, if fabrication costs are excessive it will not be produced

The design team must handle product making issues up front in the early planning stages.

It is always cheaper to make corrections before a product is manufactured Costs 1. Reduce the number of product parts
Fewer things to make / inventory
Fewer process errors
Fewer pieces to build assembly
Cleaner appearance
Use Nominal Sizes Guidelines to Design for Producibility 2. Use modular components when ever possible
Subassemblies are easier to control Guidelines to Design for Producibility 3. Strive for Z-axis assembly
Gravity is a natural assembly aid that should be taken advantage of. Guidelines to Design for Producibility 4. Use standard parts if feasible
Off the shelf items are cheaper and more readily available than custom parts Guidelines to Design for Producibility 5. Reduce or eliminate the number of threaded fasteners in a design
Threaded fasteners are trouble in assembly (human or robotic)
Use adhesives or snap fits
If screws are necessary use those that provide for easier tool engagement – allen or phillips head Guidelines to Design for Producibility 6. Use self aligning and self nesting parts where practicable in a design
More important in automated assembly Guidelines to Design for Producibility 7. Use symmetrical parts to simplify assembly
Chamfered pins
Symmetrical parts Guidelines to Design for Producibility 8. Design specifically for automation at the outset. Not after design is completed
More cost effective
Material
Fasteners
Assembly tools Guidelines to Design for Producibility 9. Use human assemblers wisely
The human hand is an ideal assembly tool
Keep them from becoming exhausted
8 hours is a long time… Guidelines to Design for Producibility 10. Match the design and the material to the forming process
All 3 warrant serious study to assure quality part pieces Guidelines to Design for Producibility 11. Design parts that are impossible to assemble incorrectly
Acknowledge the fact that humans and machines make mistakes Guidelines to Design for Producibility 12. Design for ease of fabrication
Simplify part design so they can be made quickly, easily, and economically Guidelines to Design for Producibility Processes are methods of transforming raw materials into usable products
Generally grouped as:
Cutting
Forming
Assembling
Finish techniques Process Design Factors Each process has specific unique design attributes that make producibility easier and more efficient

Where do I find out this information?
Any suggestions? Process Design Factors Surprise, surprise, surprise… Process Design Factors Example for extruded part design
Bralla Text section 3.6, and text:
Avoid deep narrow grooves, long thin legs, and undercuts
Avoid sharp corners, bevels, and chamfers
Avoid abrupt changes in section
Avoid unnecessary hollow shapes
Avoid knife edges – they tend to present a wavy appearance
Provide generous fillets and rounds for steel extrusions
Use uniform wall thickness in sections
Use webs for better dimensional control
Use symmetrical design for semi hollow area
Use rib stiffeners to reduce twisting Process Design Factors We have learned that we need to be good stewards of our environmental resources and be able to use them well and as many times as possible

In design for disassembly the designer is confronted with the matter of taking things apart easily for reuse or recycling purposes

Easier maintenance is usually a by product of this Design for Disassembly 5 features of design for disassembly in products Design for Disassembly 1. design a product so all components can be easily separated, handled, and cleaned Design for Disassembly 2. Use two-way snap fits or have break points on the snap fits that will simplify disassembly and assembly Design for Disassembly 3. Clearly define the separation points
Edges, different colors or materials etc. Design for Disassembly 4. use interlocking techniques to reduce fasteners and adhesives as much as possible Design for Disassembly Bluetooth Laser Virtual Keyboard Cool Product Design Pock-It Cool Product Design Finish The End
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