When performing electrical work have to drill a very large number of holes in the walls and partitions. In a brick or prefabricated houses not to dispense with carbide drills. However, such a tool is not enough for a long time: the working edges of the drill bits become dull and crumble and need to be sharpened. This is typically done using special “green” wheels, but they are expensive and wear out quickly. Faced with this problem, I started looking for alternative technology and stopped at electroerosion grinding devices.SPARK DRILL SHARPENING
When performing electrical work have to drill a very large number of holes in the walls and partitions. In a brick or prefabricated houses not to dispense with carbide drills. However, such a tool is not enough for a long time: the working edges of the drill bits become dull and crumble and need to be sharpened. This is typically done using special “green” wheels, but they are expensive and wear out quickly. Faced with this problem, I started looking for alternative technology and stopped at electroerosion grinding devices.
The model with the air screw 2.5 cm grade3 designed and manufactured in a self-similar circle of Penza city station of young technicians. It is inherent excellent ride quality, stability and reliability of running. At the VI all-Union winter competitions, this model has a top speed 171,428 km/h and won first place.
On the instructions of the enterprises of Dzerzhinsk-khimpromenergo in the design office of the school # 2 of Dzerzhinsk, Gorky region, the guys have designed and built a device for measuring the pressure of neutral media in the pipes — an electronic pressure gauge. One of its founders, a student of the tenth class Sergey Whalin, said that the installation or repair of compressors necessary to carry out Express-analysis of the condition of the equipment. Devices, testifying to the extent necessary for a specific production, yet.
I want to share with the readers of his instrument who successfully work for a long time. Similar design available to me in the literature I have not met.
In 1966, the Commission on space models of the International aeronautical Federation (FAI) has developed a code of sport in which raketoplana divided into four classes and assigned a so-called “bird” names “Sparrow”, “swift”, “eagle” and “Condor”. On the amended in 1975 and 1989 the FAI code partition models raketoplana into categories and classes depending on the total impulse of the engine and the starting mass was clarified requirements for each category, classes are five, and since 2001 to six. Today we will talk about the category of raketoplana S4 — models of gliders with the accelerator Category is subdivided into six classes the Most popular class S4A — promised.
When I needed a megaphone, I became acquainted with the prices of Chinese industrial products: as it turned out, they cost from 1500 to 8000 rubles., and found that such a device can collect a couple of hours with her hands. A megaphone (or loud speaker), an electrical circuit which recommend and bring forth, be useful for sports, in advertising, in conditions of constant excessive noise, playing games with the child and even in the minibus for broadcasting information to passengers in the rear seats.
In Amateur practice when developing or establishing a device is often required to connect to it a certain load and still it is necessary to measure its output parameters. This scheme allows you to connect your device to one of 22 different loads the Connection of a load is either a permutation of the jumper plug into the corresponding socket, or by using two app switches the type of the EGP on 12 position Device P1 allows you to control the load voltage in three ranges to increase the accuracy of the measurement Device P2 monitors the current flowing through the load Resistors is desirable to have a capacity of at least 10 watts, C5-16, etc.