ME317

Mini-Project 3 (Final Mini-Project)

Assigned: April 28, 2003

Due: Anytime before May 23, 2003

Assignment:

· Design and mold an interesting chocolate bar

Motivation/Objective:

· practice producing CAD drawings

· gain NC machining experience

· reinforce molding concepts: mold visualization, mold release, part ejection

· develop design for molding skills: draft, undercuts, minimum wall thickness

· practice working with skilled technicians

· exercise your creativity

Outline of Procedure:

· Sketch your chocolate bar design

· See Gary Burgess (technician in Myers Bldg)

o review the design for problems

o discuss acceptable CAD file formats

o schedule a meeting to create NC code

· Capture the design in an acceptable CAD system

· Meet with Mr. Burgess to create the NC code for the milling machine

· Create the mold using the milling machine in the Myers Bldg.

· Perform secondary operations:

o add draft where necessary (filing or sanding)

o add ejection system

o sand / polish the mold to remove tooling marks

· Mold the chocolate bar

Deliverables:

· a molded chocolate bar

· the mold used to create the chocolate bar

Grading Criteria:

· creative / interesting design (20%)

· quality of the molding (60%)

o removed from the mold in a single unbroken piece

o complete mold fill

o smooth finish

· ability to work with the technician (20%)

o respectful of the technician’s time

o respectful of the technician’s ability and advice

o positive attitude when something doesn’t work as you expected

o maintaining ownership of the project