Machine is intended for wood. Plastic and composites are probably OK but watch for damage to abrasive. Do not use with metal (including, but not limited to iron, steel, aluminum, and copper) under any circumstances. If you are generating sparks, stop immediately. | Machine is intended for wood. Plastic and composites are probably OK but watch for damage to abrasive. Do not use with metal (including, but not limited to iron, steel, aluminum, and copper) under any circumstances. If you are generating sparks, stop immediately. |