To successfully make a chair, you would need the following:

1. Design or Plan: You would need a design or plan for the chair that outlines its dimensions, shape, materials, and construction details. This can be a professional blueprint, a detailed sketch, or a digital design using computer-aided design (CAD) software.
2. Tools: You would need a variety of tools to build the chair, depending on the design and materials used. Common tools include a saw (such as a circular saw or handsaw), drill, screwdriver, hammer, chisels, planes, measuring tools (such as a tape measure, square, and level), sandpaper, and clamps. Power tools such as a table saw, miter saw, and drill press can also be helpful.
3. Materials: You would need appropriate materials for the chair, based on the design and style you want to achieve. This can include wood (such as hardwood or plywood), metal, plastic, fabric, foam, and other materials for the seat and backrest.
4. Joinery Techniques: Depending on the design and materials used, you may need to use various joinery techniques to connect the chair parts together securely. This can include techniques such as doweling, mortise and tenon, dovetailing, and pocket hole joinery, among others.
5. Finishing Supplies: Once the chair is assembled, you would need finishing supplies to sand, stain, paint, or varnish the chair to protect the wood and enhance its appearance. Finishing supplies can include sandpaper, brushes, stains, paints, varnishes, and other appropriate finishing materials.
6. Safety Gear: It's important to prioritize safety when working on any woodworking project, including making a chair. Safety gear can include items such as safety glasses, gloves, hearing protection, and a dust mask to protect yourself from potential hazards associated with woodworking.
7. Skills and Knowledge: Finally, you would need the skills and knowledge to work with the tools, materials, and techniques required to build a chair. This can include woodworking skills, understanding of joinery techniques, ability to read and interpret plans or designs, and knowledge of finishing techniques.

Building a chair can be a rewarding and challenging woodworking project. It's important to have a good plan, the right tools and materials, knowledge of woodworking techniques, and a focus on safety to ensure a successful outcome. If you're new to woodworking or chair-making, it may be helpful to start with simpler projects and gradually work your way up to more complex designs as you gain experience and confidence in your skills.
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