Notes

Outline

Review Definitions Machine A collection of components that effectively transmit or transform forces, energy, motion, or loads for a specific purpose Design Applying mathematical and scientific principles in order to produce useful devices and processes Machine Design Calculating motions, forces, and or energy in order to size, specify geometry and materials for a collection of interrelated components that work safely and effectively together for a specific purpose

The Design Process A need must exist for the machine Search for existing machines that may fulfill the need; search for information that may be useful in the design State the function and goals for the machine Outline the criteria and constraints of the design Begin ideation and invention stage (synthesis) Analyze the resulting design Select machine components Detail the design with drawings and specifications Build and test the prototype Produce the design

Establishing a need Design a pogo-stick for use by small children

Conduct a search for existing designs Name 5 Places that you would search for possible existing designs 1 2 3 4 5

Insert functions and goals for the page turning device Functions: Goals:

Criteria and constraints Constraints: Criteria:

Begin synthesis Work in groups of three or four and begin sketching your proposed design Include as many details as you have time Anticipate what types of analysis would be necessary to demonstrate that all design constraints are met. Iterate as you have time between now and our next meeting

Analyze design Look at critical loadings Make and clearly state important assumptions Size parts and establish geometry based on what loading analysis suggests Specify materials based on loadings

Select component parts Any parts from stock will greatly reduce cost Any required machining will increase cost

Detail the design parts drawings assembly drawings dimensions tolerances

Build, test and take into production Are there manufacturing concerns? What testing conditions should be set up? How much testing is warranted? How do we establish a factor of safety for this type of device?