Final answer:
The four methods that can be used to produce a mold without cutting tools are 3D printing, rotational molding, electroforming, and investment casting.
Step-by-step explanation:
Four methods that may be used to produce a mold where no cutting tools are involved are:
- 3D Printing: This method uses a computer-controlled process to create a three-dimensional object by layering material on top of each other.
- Rotational Molding: It involves heating a hollow mold and rotating it so that the material inside spreads evenly and forms the desired shape.
- Electroforming: This process uses an electric current to deposit a layer of metal onto a conductive surface, creating a mold.
- Investment Casting: It involves creating a wax replica of the desired object, which is then coated in a ceramic material and heated. The wax melts, leaving behind a mold that can be filled with molten metal.