The masonry bit is a variation of the Twist Drill Bit, the bulk of the tool is a relatively soft steel, and is machined with a mill rather than ground. An insert of tungsten carbide is brazed into the steel to provide the cutting edges.
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On the 9th, it was learned from the Zhejiang Development and Reform Commission that after review and screening, Zhejiang Province plans to add 187 key provincial construction projects in 2010 with a total investment of 262.5 billion yuan and an annual planned investment of 58 billion yuan. After the addition, together with the continuous construction project, this year's Zhejiang Province key construction project investment plan is planned to be 135 billion yuan, an increase of 30 billion yuan over the previous year, an increase of 28.3%.
Among the key construction projects this year, the high-speed railway is still the main event, with an annual investment of 40 billion yuan, accounting for 69% of the annual investment plan. Investment in the service industry continued to expand. Among the new projects, 20 were modern service industries with a total investment of 17.5 billion yuan. The proportion of private investment has expanded in this year's key projects, with a total investment of 33 billion yuan in industrial projects. Investing about 1.5 billion yuan in the AkzoNobel vinylamine project, investing about 1.1 billion yuan in annual production of 150 sets (sets) CNC sleeper, CNC vertical car and other Qi 2 machine heavy machine tool production base project, etc., located in Lin'an, Zhejiang Province The successful implementation of a number of modern service industry projects, such as the scientific research institution innovation base and the Huzhou Multimedia Industrial Park, will play an important role in the province's economic growth and sustainable development in the future. In addition, a number of agricultural water projects, transportation projects, energy projects, social development projects, urban construction and infrastructure projects are also included in the plan.
Masonry bits typically are used with a Hammer Drill, which hammers the bit into the material being drilled as it rotates; the hammering breaks up the masonry at the Drill Bit tip, and the rotating flutes carry away the dust.
Hammer drill bits often use special shank shapes such as the SDS type, which allows the bit to slide within the chuck when hammering, without the whole heavy chuck executing the hammering motion.
Masonry bits of the style shown are commonly available in diameters from 3 mm to 40 mm. For larger diameters, core bits are used. Masonry bits up to 1,000 mm (39 in) long can be used with hand-portable power tools, and are very effective for installing wiring and plumbing in existing buildings.
Zhejiang's new machine tools and other key projects have a total investment of 262.5 billion yuan
In 2010, Zhejiang Province plans to add 187 key provincial construction projects with a total investment of 262.5 billion yuan and an annual planned investment of 58 billion yuan. Among them, the AkzoNobel vinylamine project with an investment of 1.5 billion yuan, the annual production of 150 sets (sets) of CNC sleepers, CNC vertical vehicles and other Qi 2 machine heavy-duty machine Tool production bases.