Worm wheel on a lathe. Drawing, description

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Worm wheel on a lathe. home workshop

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We bring to your attention a simple device with which you can cut a worm wheel with any number of teeth on a lathe. As a cutting tool, a standard tap is used here, installed in the machine chuck and pressed by the tailstock.

The device is a mandrel installed in the tool holder. The workpiece of the worm wheel is pivotally fixed in the mandrel and fed to the rotating tap; he crashes into the workpiece and begins to cut grooves, while turning the future worm wheel. A few turns, and you can remove the finished part from the machine.

Worm wheel on a lathe

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The conductor will notice falsehood 07.02.2002

How does the conductor of a large symphony orchestra of a good hundred musicians manage to hear, among the roar of drums and timpani, which of the ten violins is slightly out of tune? It turns out that the conductor's brain is specially adapted for this difficult task.

A professional conductor is able to spatially localize sound in his surroundings better than any pianist or non-musician. German researchers from Magdeburg and Hannover offered seven classical music conductors, seven pianists and seven ordinary citizens a special acoustic test. They placed three speakers in front of the subjects and three around them. Randomly, the speakers played a series of standard tones, but sometimes the scientists added frequency-shifting noise to the sounds.

Listeners were asked to press a button if a false note came from one of the speakers. Measurements of brain activity and error rates showed that all three groups were equally good at picking up false sounds from the center speaker, but only the conductors could accurately detect false sounds from the side speakers. In all three groups of subjects, the same area of the brain was active, and no differences were found in the structure and sensitivity of the hearing organs of professionals and ordinary people.

The conductor is forced to constantly pay attention to the entire orchestra, located in front of him in a semicircle. This daily practice develops an amazing ability to localize sound.

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