영어공부자료/Professional English in Use_Engineering12 12. Steel A. Carbon steels This extract from an article in an engineering journal is about different types of steel. Steel is the most widely used engineering material. Technically, though, this well-known alloy of iron and carbon is not as simple as one might think. Steel comes in a huge range of different grades, each with different characteristics. For the inexperienced, it can be difficult to know whe.. 2023. 3. 20. 11. Material types A. Metals and non-metals Engineering materials can be divided into: ■ metals - examples of metallic materials are iron (Fe) and copper (Cu). ■ non-metals - examples of non-metallic materials are carbon (C) and silicon (Si). As iron is such a widely used material, metals can be divided into: ■ ferrous metals - those that contain iron ■ non-ferrous metals - those that do not contain iron. *fer·rou.. 2023. 3. 13. 10. Measurable parameters A. Supply, demand and capacity The article below is from the technology section of a business magazine. Calculating the capacity of an electricity grid - the amount of energy it needs to supply to users - might seem simple. Just add up the power supplied over a given period of time to give the total amount consumed by users. Then, divide the cumulative amount of power used during the whole perio.. 2023. 3. 6. 9. Area, size and mass A. Area The textbook extract below looks at different aspects of area. Dimensions of wires and cables The sizes of electrical wires are specified by a number which gives an area in square millimetres. For example, in a home, a 6 mm² wire may be specified to supply an electric oven in a kitchen. This number gives the cross-sectional area of the conductor. Increasing the cross-sectional area allow.. 2023. 3. 6. 8. Numbers and calculations A. Decimals and fractions A manufacturer is thinking about giving both metric measurements (for example, millimetres) and imperial measurements (for example, inches) in its product specifications. One of the company's engineers is giving his opinion on the idea in a meeting. 'One problem is, when you convert from metric to imperial you no longer have whole numbers - you get long decimal numbers... 2023. 2. 20. 7. Dimensional accuracy A. Precision and tolerance It is impossible to produce components with dimensions that are absolutely precise, with sizes exactly the same as those specified in a design. This is because all production processes are imprecise to a certain extent. Therefore, the sizes of several components produced from the same design will vary (differ). Although the variation may only be a few hundredths of a m.. 2023. 2. 20. 6. Dimensions of circles A. Key dimensions of circles An engineer is giving a training course to a group of technical sales staff who work for a tyre manufacturer. During the talk, she mentions a number of dimensions relating to circles. 'Obviously, the outside edge of a tyre forms a circle, as you can see in this simple diagram. The outer circle in the diagram is the outside of the tyre, and the inner circle - the circ.. 2023. 2. 20. 5. Location and setting out A. Centrelines and offsets The drawing below shows the position of some holes for bolts. The distances between the holes can be shown as running dimensions or as chain dimensions. In both cases, the centerline (CL) - a line through the centre of the hole - is marked (drawn), and the distances between the centrelines are given. Distances between centrelines are called center-to-center (c/c) dimen.. 2023. 2. 19. 4. Horizontal and vertical measurements A. Linear dimensions The web page shows the key dimensions of the Airbus A380 in meters, and the explanations below it describe how they are measured. In the explanations, the word plane means an imaginary surface (not an aeroplane). On drawings, planes are shown as lines that indicate where dimensions are measured from and to, and are positioned to strike (touch) the faces (edges or surfaces) o.. 2023. 2. 19. 이전 1 2 다음
