How are bobbins or coil forms made used in guitar and bass pickups?
A bobbin or coil form can be made from a variety of materials that are used to hold the coil and/ or magnets as it is wound. The bobbin can be injection molded for consistent parts made of specified plastics and color. The flatwork can be punched from a variety of materials such as vulcanized fibre and linen phenolic and when combined with rod magnets make the coil form. Bobbins can be machined out of a block of non-conductive material such as phenolic, plastics or even wood. Bobbins can be made from thermoformed plastics for a variety of shapes. Air coils are often wound without a bobbin and wound to a desired coil shape using a collapsible fixture. After the air coil is wound the winding fixtures is removed leaving the coil that is carefully placed into a silicone mold.. Once the air coil is carefully placed into the mold other components are added such as magnet, pole pieces and hookup wire are added. After everything is in place the mold is filled with epoxy or similar potting solu
