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#056 LCA Mechanism Planning Method - 5 : Check List Items for Mechanism Plans

Category : Hints on designing
September17, 2010

From simple jig fixtures to automated assembly machines and machine tools, all machines are based on the following three functionalities.

Three Functionalities of Machines Key Points to Consider
Creating intended motion
1. Converting human motion into mechanically inclined motion
2. Simplify with less mechanical elements
Support and transmit forces
1. Consider reaction and inertia forces
2. Structure of closed force flow
3. Rigidity of supporting structure
Spacial layout of mechanical elements and units
1. Compact overall layout
2. Work locating function
3. Ease of use

Check list items during the concept/design phase for the three functionalities above are as shown below.

Check List Items
During Concept/Design Phase		Item Details
Functionality
・Is the structure suited for the purpose?
・Is the design not overkill?
・Advantage over an alternative confirmed?
・Can the system adopt process changes?
・Ease of manufacture (Design can be complex)
Utility
・Is it reliable and safe?
・Is it easy to inspect, clean and repair?
・Any negative effects such as vibrations, noise and pollution on the environment
Simplification
・Can the mechanical elements be reduced?
・How about standardization by commercially available components, and part interchangeability?
・Can the structure be simplified by combining functionalities?
・Can the system configuration be simplified?
Economy (Cost Reduction)
・How to avoid specification overkill (parts, materials)?
・Are economical materials and processes selected?
・Considerations for time reduction of design/manufacture/deployment?

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