Molding and Casting

The goal of this week is to:
  • Create a Mold
  • Cast a Part

  • Plan

  • Make a tool for the final project.
  • I am going to cast a part to be used on the shelf. The shelf will hold tools, so I am going to cast a holder for pliers.
  • Trace a real pair of pliers using CorelDraw.
  • Use that sketch outline(SVG) to create a millable image.
  • Mill the pliers using CNC machine.
  • Choose a soft (semi-rigid) plastic to cast.
  • Process

    This is the starting image:

    These are the SVGs:

    The SVG were imported into Easel. Easel generated the gcode. I attached pink foam to the wasteboard of the CNC mill(Carvey) using the clamps and tape.
    I choose the correct material type and the correct size for the material.
    This is the milled mold:

    This mold was used to check the size.

    After confirming the size, the reverse mold was made.

    This is the cast plastic:

    To cast, I chose Smooth-Cast 326. It is a semi rigid material. I should have cast first with a silicone mold. This would have made a better mold. The mold is not very smooth.

    I tried several things as a releasing agent. Petroleum Jelly worked best. Universal Mold Release worked as well, but the rough parts of the mold still show up in the mold. No releasing agent left a bumpy surface.


    Needle Nose SVG
    Wire Stripper SVG
    Calipers SVG