The vacuum former has different parts, there is the vacuum on and off switch and reverse lever. The toggle clamps hold the plastic sheet while the heating plastic and the platen,on which the mould sits on. The heater and its controls, the platen lifter,lowers and raises the platform.
To begin the process you must make sure the mould has smooth edges,the sides are tapered at 5 degrees and it has vent holes drilled in the middle.