Corded Drill
The use of electric rigs. It is a tool of power in conventional products, but also increased demand for target = "_blank" title = "cordless drill batteries"> Drills products. Annual production and sales accounted for 35% of power tools in the specifications China.Main 4,6,8,10,13,16,19,23,32,38,49 mm drill and so on, refers to a tensile strength of steel drills 390N/mm2 diameter. Pairs of non-ferrous metals, plastics and other materials as the original diameter of the largest drilling large size of 30 ~ 50%
Cordless Drill works rotating magnetic or electromagnetic small piston engine rotor's ability to do the job of cutting operation of the magnetic field through transmission powered device by the operation, Turn the gear wheel to increase the electric drill so that the shaving surface drilling, better swept objects.
The birth of the world title = "electric drill tools"> Drilling tools is the result of feeding from the beginning – And in 1895, the German company has developed Fein first DC in the world drilling, which states that the weight of 14 kg drilling, casing is made of iron cast can only be drilled in a steel plate 4 hole mm. Subsequently, there were three-phase power frequency (50 Hz), electric drill, but the speed no engine to break 3000r/min.
In 1914, there has been a single phase series excited motor driven by drilling, the engine speed up 10000r/min up.
In 1927, there have been frequent power 150 ~ 200Hz IF drill, both with one set of phase excited advantages of high-speed motor, but also has three phase power frequency electric motor structure, simple, reliable benefits, but should be used for the IF current of electricity is limited use.
In 60 years, has been to use nickel-cadmium batteries for cordless power supply of battery power drill type. By mid to late 70s, the lowest prices due to the battery, charging time is shorter, the exercises in Europe and the United States, Japan, widely used.
Electric drill to make the first cast-iron shell, so use aluminum for housing. 60, thermoplastic engineering plastics in drilling applications gain, and had a double off exercise.
60 years have emerged drill electronic speed. This component of drilling, such as the use of thyristor composed of electronic circuits to change press the button has been pressed to depth to adjust the different speed, so that the use of exercise when the object to be processed by different (as the material is different orifice diameter, etc.), choose a different speed.
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A cordless drill can be an excellent tool for home improvement jobs or commercial jobs. Choose an appropriate cordless drill batteriesis very important to use it for Drills
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In the Shop tests corded drill
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