forstner bit การใช้

• They have advantages over Forstner bits when boring into end grain.
• Forstner bits were invented and patented by Benjamin Forstner in 1874.
• Forstner bits have radial cutting edges to plane off the material at the bottom of the hole.
• Forstner bits can cut on the edge of a block of wood, and can cut overlapping holes.
• Forstner bits have no mechanism to clear chips from the hole, and therefore must be pulled out periodically.
• For example, a set of forstner bits may contain 10, 15, 20, 25 and 30 mm diameter cutters.
• The purpose of the drilling jig is to hold a Forstner bit in place, at a 90?angle while drilling 3 cm pit hole.
• Many types of specialised drill bits for boring clean holes in wood have been developed, including brad-point bits, Forstner bits and hole saws.
• A Forstner bit could bore the mounting hole for the hinge, but particle board and MDF are very abrasive materials, and steel cutting edges soon wear.
• Forstner bits, named after their inventor, Benjamin Forstner, bore precise, flat-bottomed holes in wood, in any orientation with respect to the wood grain.
• Forstner bits, also known as Forstner flange bits or webfoot augers, bore precise, flat-bottomed holes in wood, in any orientation with respect to the wood grain.
• A tungsten carbide cutter is needed, but the complex shape of a forstner bit is difficult to manufacture in carbide, so this special drill bit with a simpler shape is commonly used.
• The jig then has some means of placing the centre of the Forstner bit into to the centre of the marked hole, in a way that a 90?angle is maintained respect to the door surface.
• For most " concealed hinge " s to work properly, a pit hole must be created on the door at the point where it faces the static part of the hinge which is screwed to the inside wall of the wardrob . To create the pit hole, the jig must be fixed in place by means of the provided clamp, spin the Forstner bit by applying an electric hand-drill to its axle.