The adapters are easy to put on the vise and to take off. They just slide over the jaws.
Step 1: Safety While Heating PVC
Vinyl Chloride, one of the components of PVC, is carcinogenic. When it is locked up in the polymer, however, it is much safer to be around. In my years of experience working with PVC, I have not noticed any adverse effects on my health from being around it.
Always work in areas with good ventilation. If you do get caught in a cloud of smoke, hold your breath and move to clean air.
When heating PVC with a gas stove or propane torch, try not to let it burn. Smoke from burning PVC is bad. With experience one burns it less and less. Don't panic the first time you do burn some. It scorches, but doesn't immediately burst into flame. Move the material away from the flame and try again. Don't breathe the smoke. Smoke avoidance comes naturally for most people.
While heating PVC over a gas flame, keep the plastic an appropriate distance from the flame to avoid scorching the surface before the inside can warm up. It takes time for heat to travel to the center of the material being heated.
Keep the plastic moving, and keep an eye on the state of the plastic. When heated, the PVC material is flexible, like leather. Beyond this stage, you risk scorching it.
A word from James, the plastic engineer -- "Just a word of warning, PVC can handle some high heats but if it catches fire, you wont be able to put it out, it does not need oxygen to burn so don't do this inside".
I do work inside, but my house is made of cement and has good ventilation. MAKE SURE THAT YOU HAVE GOOD VENTILATION. PLAY WITH FIRE -- CAREFULLY.
Step 2: Planning and Layout
Step 3: Preparing the Vise
Step 4: Cutting and Opening Up the PVC
Cut the pipe section down one side. Hold the material with pliers, and soften it over a gas stove. When it is floppy, like a piece of leather, it is ready for heat forming.
Step 5: First Heat Forming
The next step will be to fold down the tabs on the sides of the jaws. Pencil in where you need to cut and then make the saw cuts.
Step 6: Fold Down the Tabs
Round of sharp corners when the plastic cools. I used snips and a file to round the corners.