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.
Forstner Bits,bosch forstner bits,colt forstner bits Behappy Crafts (suzhou)Co.,Ltd , https://www.craftsbehappy.com
The largest stone market in North China was put into use at the end of August
The largest and most complete stone market in North China will be completed and put into use in the Tianjin Binhai New Area Lingang Economic Zone at the end of August this year. According to Zhang Jiandong, the person in charge of the Binhai International Stone Port Project, Binhai International Stone Port covers an area of ​​1,300 mu and has a total construction area of ​​more than 540,000 square meters. It was completed in three phases. “There are only a few small-scale processing plants in North China, which can't meet the procurement needs of raw stone and large stone. In the past, the large-scale stone needed for construction projects in these areas had to go to the south to purchase, and ordered to run back and forth several times.†Zhang Jiandong said that More than 10 well-known stone enterprises at home and abroad have settled in this market, and the demand for stone materials for large-scale projects in Tianjin and surrounding areas will be met in the future. After the project is put into use, it will become a comprehensive stone market integrating stone trading, processing, design, construction, warehousing, logistics and supporting business services.