Whether you're winding coils for an experiment, hobby or repair job, coil winding is usually a tedious process. Alleviate the chore of hand-winding coils by building your own simple coil-winding machine. These machines only have three basic parts -- the mandrel, the base and the upright supports. Luckily, you can make each of these parts with basic construction materials and assemble them to make a functioning coil-winding machine.
Cut the larger board to a length of 90 cm (3 feet). This will serve as the base for the coil-winding machine.
Cut the smaller board into two 20 cm (8 inch) pieces. These will serve as the upright supports for the coil winding machine.
Stand the smaller uprights you've made 15 cm (6 inches) from each end of the larger board. Mark around their perimeter with a pencil.
Drill two pilot holes where you will mount each upright. The pilot holes should be the same distance from each other and the edges of the marking you made. Use a drill bit with a diameter that is slightly smaller than the diameter of the screws you will use to mount the uprights.
Drill a hole with a diameter slightly larger than the diameter of the steel rod you will use for the mandrel 2.5 cm (1 inch) from the top of each upright piece.
Secure the uprights to the base with wood screws that are at least 7.5 cm (3 inches) long. The hole you drilled earlier should be at the top of each upright.
Insert the steel rod into the vice with 12.5 cm (5 inches) of the rod sticking up above the vice. Tighten the vice until the rod is held firmly in place.
Hammer the rod over until it bends at a 90-degree angle.
Loosen the vice and slide another 12.5 cm (5 inches) of the rod out so that a total of 25 cm (10 inches) of the rod -- including the bent section -- protrudes from the vice.
Hammer the rod over to create another 90-degree angle so that the end of the rod makes a "Z" shape. This will form the handle of your mandrel. Remove the rod from the vice.
Insert the steel rod into the hole you drilled in the uprights.
Clamp the wire for your coils to the mandrel with the vice grips. Rotate the mandrel handle with the wire clamped in place to begin forming your coil.