Machines with a toothed cutter in the shape of a spur-gear or the like which is rotated to generate the thread profile as the work rotates specially adapted for making conical screws, e.g. wood-screws
Machines with a toothed cutter in the shape of a spur-gear or the like which is rotated to generate the thread profile as the work rotates specially adapted for making conical screws, e.g. wood-screws