From Junk Jack Wiki
 Crafting Furniture
Crafting furniture are required to craft some items. To use them, Jack needs to be within one square from them. Then they are used automatically when crafting. In 1.1, the crafting background will differ depending on the addon used.
- Workbench is the most basic crafting furniture and it is required to build all furniture elements (doors, windows, etc)
- Forge is used to smelt ore into ingots and cook meat to heal you faster.
- Anvil is used to craft ingots into Metal Tools