Positive form mold Subject

The final result of my endeavors and the subject of this book is the machine shown in figure 1. It uses a 120 volt heating element and is capable of forming 12 x 15 sheets of plastic up to l/4 thick and uses both positive and negative molds. The machine shown in figure 1 is using an air venturi pump for the vacuum source, but the it is set up to easily operate with an electric vacuum pump if you so choose. The machine is built on wheels so it can be easily moved from place to place and anotlier nice feature is the adjustable platen table making it possible to form molds of different sizes. 

This is an excellent book for the beginner. Walsh does an excellent Job of covering the subject of vacuum forming using positive molds. Chapters include Types of plastics, mold materials, heat sources, vacuum sources and tips and examples. He also describes methods for building a simple machine. 

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