2.008 Design AND MANUFACTURING II
Soot Sprite
Spirited Away,
Studio Ghibli
MIT 2.008 is a six-person team-based product design and manufacturing class focused on taking a part from CAD through full-scale production. The class centers around designing and manufacturing a custom yo-yo while learning CNC machining, injection molding, process planning, and design for manufacturing (DFM).
Inspiration
Design
Mold and Thermoform
DESIGN & Fabrication
Many iterations were required to reduce defects, ensuring proper shut-off tolerances to prevent flashing at the parting line.
Thermoforming Mold Iteration
CAD/CAM
Cavity and Core
for Injection Molding
Cavity and Core
CNC Machining
Injection Molding
Defects & Press Fits
Process Distribution
I.M. Optimization
Short-Shot at Shut-Off
increase shot size,
increase packing pressure
Shrinkage Calculations
CAD vs Experimental Values
Ejector Pin “Poke-Through”
increase cooling time,
decrease pin length
Flash at Parting Line
increase clamping pressure, decrease packing pressure
Majority of bodies and rings did not meet individual specification limits, but 97.78% (n=50) of Yo-Yo’s met press fit specifications!