Injection Molding

• The positive was designed first, paying special attention to where we could place parting lines, sprues, runners, and making sure that adequate draft was maintained

  • We ended up adjusting the original design to remove the holes, and moving them to post injection operation because they added too much complexity and time to the machining portion of the project. Namely, they would’ve required over 2 hours of active milling time with a 1/32nd end mill, and we opted to swap this for a quick post-inj op instead

• The part and mold were both designed in SolidWorks, and the gcode was generated in Mastercam

• The mold was machined in two halves, on a Haas Mini Mill

  • The stock was first squared up on a mill, and then the Mini Mill was used to create the cavity and registration pockets for the injection molding machine

• The injection mold was done with polypropylene and several dyes

• The final parts were pulled from the mold and then finished on the mill

  • The sprue was removed and a bolt hole pattern was used to add the through holes

• The final design was intended to mimic a classic cocktail shaker, but sized for a shot glass