Bevel Protractor.pptx
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1. The document discusses bevel protractors, which are instruments used to measure angles. 2. It defines key angle measurement terms like degrees, minutes, and seconds. 3. It describes the main parts of a bevel protractor including the body, base, blade, locking nut, adjusting screw, and eyepiece. It is used to measure angles by placing the blade against the workpiece.
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This document discusses various tools used to measure angles precisely in engineering workshops. It begins by explaining the sexagesimal system of defining angular units in degrees, minutes and seconds. It then describes the protractor as a basic tool that can measure angles to a least count of 1° or 1/2°. The document goes on to explain how a sine bar works by measuring the sine of an angle using the relationship of the height difference between two rollers to the distance between their centers. It notes guidelines for proper use of a sine bar such as only using it for angles under 45° and with a surface plate and slip gauges. Finally, it briefly introduces the sine center for measuring conical workpieces held between centers, and
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This document describes various instruments used to measure angles, including protractors, vernier bevel protractors, optical bevel protractors, sine bars, sine centers, angle gauges, and clinometers. It provides details on how each instrument works, its components, and advantages and disadvantages. For example, it explains that a vernier bevel protractor uses a main scale divided into degrees and a vernier scale divided into minutes to measure angles with precision down to minutes of an arc. A sine bar is used with slip gauges to measure angles but becomes less accurate above 15 degrees.
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This document discusses various instruments used to measure angles:
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5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
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