Solved: MME 3380 Can Crusher Design Assignment

Individual Design Assignment
Task:
You are tasked with designing a link-based can crusher (see page 2) that is capable of crushing a standard pop can (height: 120mm, radius: 30mm, Force-to-Crush: 750N) to half of its normal height. Assume that the force
applied to crush the can at the handle cannot exceed 250N. There are several assumptions that you will have to make while you are designing this, including dimensions and materials of all of the parts that you design, etc.

Accordingly, you are in control of your design and the project is very open-ended. You may find it easier to start by sizing your components on paper (performing the FBD analysis, etc), then CAD your parts, but ultimately, how you proceed and iterate is up to you.

Deliverable: You must submit a printed report outlining the design of your can crusher to the course locker.
Due Date: February
Specific Requirements:

1. Outline:
   a. The purpose of the project.
   b. The constraints imposed on the can crusher design (e.g., crushing force, permissible hand force,
   etc).
   c. Any significant assumptions that you have made about the design.
2. Figures of the operating conditions of the can crusher.
   a. Show both the open and crushed positions so that we can see that the can would fit, and could be crushed.
3. A stand-alone table indicating all of the parts that you have designed, as well as the fasteners that must be used to assemble your can crusher. You must indicate where the fasteners are sourced from (including part numbers, etc.), how many of each part should be included, and the material of all parts and fasteners. Note: this is similar to a Bill of Materials, but should be separate.
4. Technical Free Body Diagram (FBD) analysis.
   a. Complete FBD for the top plate, the link, and the lever arm (Page 2 of this document should help).
   b. All parts that you design (except the handle) must be made of standard sized sheet metal.
   c. Calculations indicating how long the arm lever should be in order to provide an adequate crushing force for the can.
   d. Axial force, transverse force and bending moment diagrams are required for the link and the arm.
   e. Factor of safety calculations for the arm lever and the link. Assume the link will fail at the cross section of one of the holes, and that the lever arm will fail at the cross-section of the hole that connects to the link. You must use stress-concentration factors for the holes, and yield as your
   failure criteria.
   f. Provide a sample calculation of any hole fits, as required by your design (e.g., sliding fit for bearing-like surfaces between the link and lever arm).
5. Interpretation:
   a. Make sure that you include comments throughout your calculations, and that you provide a paragraph discussing your final design.
6. An engineering drawing for each part that you design.
   a. Make sure parts are properly dimensioned (see course notes for tips).
   b. Holes should be tolerance as ‘sliding fits’, with actual maximum-minimum numbers indicated.
7. Engineering drawings of the assembly.
   a. Isometric view with the assembly exploded, a bill of materials, and all parts and fasteners indicated with callout bubbles.
   b. Isometric view of the assembly (not exploded) with the overall volume dimensions indicated.