| This is a chronic affection of the nervous system, characterized by muscular weakness, trembling and rigidity. Causes. It usually occurs after the fortieth year, and is more common in men than in women. The exciting causes are exposure to cold a... Read more of SHAKING PALSY. (Paralysis Agitans) at Home Medicine.ca |  Informational.caPrivacy |
Steel MakingCritical PointsOne of the most important means of investigating the properti... Double Annealing Water annealing consists in heating the piece, allowing it to... The Pyrometer And Its Use In the heat treatment of steel, it has become absolutely nece... Corrosion This steel like any other steel when distorted by cold worki... Heat Treatment Of Axles Parts of this general type should be heat-treated to show the... Air-hardening Steels These steels are recommended for boring, turning and planing... Annealing There is no mystery or secret about the proper annealing of d... Annealing Method Forgings which are too hard to machine are put in pots with ... Heat Treatment Of Steel Heat treatment consists in heating and cooling metal at defin... Quenching It is considered good practice to quench alloy steels from th... Cutting-off Steel From Bar To cut a piece from an annealed bar, cut off with a hack saw,... Calibration Of Pyrometer With Common Salt An easy and convenient method for standardization and one whi... Affinity Of Nickel Steel For Carbon The carbon- and nickel-steel gears are carburized separately... Phosphorus PHOSPHORUS is an element (symbol P) which enters the metal fr... Standard Analysis The selection of a standard analysis by the manufacturer is t... Vanadium Vanadium has a very marked effect upon alloy steels rich in c... Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer For extremely high temperature, the optical pyrometer is lar... Liberty Motor Connecting Rods The requirements for materials for the Liberty motor connecti... Effects Of Proper Annealing Proper annealing of low-carbon steels causes a complete solu... The Care Of Carburizing Compounds Of all the opportunities for practicing economy in the heat-t... |
Lathe And Planer ToolsCategory: HIGH-SPEED STEEL FORGING.--Gently warm the steel to remove any chill, is particularly desirable in the winter, then heat slowly and carefully to a scaling heat, that is a lemon heat (1,800 to 2,000 deg.F.), and forge uniformly. Reheat the tool for further forging directly the steel begins to stiffen under the hammer. Under no circumstances forge the steel when the temperature falls below a dark lemon to an orange color about 1,700 deg.F. Reheat as often as is necessary to finish forging the tool to shape. Allow the tool to cool after forging by burying the tool in dry ashes or lime. Do not place on the damp ground or in a draught of air. The heating for forging should be done preferably in a pipe or muffle furnace but if this is not convenient use a good clean fire with plenty of fuel between the blast pipe and the tool. Never allow the tool to soak after the desired forging heat has been reached. Do not heat the tool further back than is necessary to shape the tool, but give the tool sufficient heat. See that the back of the tool is flatly dressed to provide proper support under the nose of the tool. HARDENING HIGH-SPEED STEEL.--Slowly reheat the cutting edge of the tool to a cherry red, 1,400 deg.F., then force the blast so as to raise the temperature quickly to a full white heat, 2,200 to 2,250 deg.F., that is, until the tool starts to sweat at the cutting face. Cool the point of the tool in a dry air blast or preferably in oil, further cool in oil keeping the tool moving until the tool has become black hot. To remove hardening strains reheat the tool to from 500 to 1,100 deg.F. Cool in oil or atmosphere. This second heat treatment adds to the toughness of the tool and therefore to its life. GRINDING TOOLS.--Grind tools to remove all scale. Use a quick-cutting, dry, abrasive wheel. If using a wet wheel, be sure to use plenty of water. Do not under any circumstances force the tool against the wheel so as to draw the color, as this is likely to set up checks on the surface of the tool to its detriment. Next: For Milling Cutters And Formed Tools Previous: Cutting-off Steel From Bar
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