Forstner bits, flat-bottomed to drill holes in wood materials, they can cut on the edge of a block of wood, and can cut overlapping holes; for such applications they are normally used in drill presses or lathes rather than in hand-held electric drills. Because of the flat bottom of the hole, they are useful for drilling through veneer already glued to add an inlay.
The bit includes a center point which guides it throughout the cut (and incidentally spoils the otherwise flat bottom of the hole). The cylindrical cutter around the perimeter shears the wood fibers at the edge of the bore, and also helps guide the bit into the material more precisely.
Forstner bits have radial cutting edges to plane off the material at the bottom of the hole. The bits shown in the images have two radial edges; other designs may have more. Forstner bits have no mechanism to clear chips from the hole, and therefore must be pulled out periodically.
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"China's Tool industry during the 12th Five-Year Plan period will focus on the development of high-efficiency tools, the high-end market share of domestic high-efficiency tools will increase from the current 15% to 30% to 40%; at the same time in the aerospace, energy transportation, national defense military, etc. Modern manufacturing selects a number of typical parts production lines, provides a full range of services in processing technology and cutting tools, and enhances the ability to provide comprehensive solutions for manufacturing companies, thereby enhancing the competitiveness of China's tool companies as a whole." 8 On the 22nd to the 25th, Hao Ming, chairman of the China National Machinery Industry Metal Cutting Tool Technology Association, at the enlarged meeting of the Standing Directors of the Knife Association in 2011, represented the Association to the above-mentioned description of the “12th Five-Year†development goal of the tool industry. Focusing on how to achieve the "Twelfth Five-Year" development goals, Chairman Hao Ming introduced the planning ideas on the policy measures, system construction and technical measures for the development of domestically produced tools. When talking about technical measures, Hao Ming pointed out that it is necessary to achieve breakthroughs in three aspects: First, to achieve key breakthroughs in key technologies for high-speed steel, hard alloy, and super-hard tool materials; second, to establish key aspects in coating technology. Coating technology platform, research new coating method, realize breakthrough of coating material system with independent intellectual property rights; third, continue to promote the development of digital design and manufacturing technology, vigorously promote the application of modern tool manufacturing equipment, and establish effective Cutting database system, research and development of advanced CNC tool grinding, material forming equipment and cutting edge strengthening equipment.