Gear cutters are selected based on the following conditions.ġ) Properties of materials for work piece and tools.ģ) Structure of gears such as spur gear, helical gears and so on. #HELICAL GEAR DESIGN CONSIDERATIONS PRO#Gear profile usually starts, from base circle and ends with tip teeth are made in such a way that their contact is along the pro the top surface of teeth is made, flat, the tip of the teeth of one gear dig I into the bottom flank of mating gear. What is interference in gears? How can you overcome it? Vi) Life of gears required, usually 10,000 hours.ĩ. Iv) Causes for gear failures and their preventing methods. Iii) Amount of gear ratio for single step. I) The amount of.power to be transmitted. Hence following factors should be considered for selecting a specific type of gear drive. See also : Basic Of Gears -Gear Terminology/ Gear nomenclatureĨ. What preliminary design considerations should be, adopted, When selecting gear drive?Īll kinds of gears can not be useful for all kinds of work. Usually, the gear ratio should always be greater than one. At is also defined as the ratio of high speed to the low speed in a gear drive. (i) is the ratio of number of teeth of larger gear to that of smaller gear. If we assume the tooth thickness as t, and space width as t2 then backlash = t2 – tl Non-metallic gears are employed ‘where we require silent operation and low power transmission.įor example, in instruments like pressure gauge and so on.Ī) Pressure angle (a) is the angle making by the line of action common- tangent to the pitch circles of mating pars.ī) Module m is the ratio of pitch circle diameter to the number d of gear teeth, and is usually represented in millimetres.Ī) Back lashis the difference between tooth thickness and the space into ‘which it meshes, measured along the pitch circle. At what occasions non-metallic gears are employed. Non-metals like phemolic resins nylon, bakelite etc.Īmong them steel with proper heat treatment is extensively, employed in many of ‘the engineering applications.Ī) Tooth breakage. Non-ferrous metals such as brass, bronze, etc.Ĥ. Ferrous metals such as carbon steels, alloy steels of nickel, chromium and vanadium.ģ. 3.Illustrate the materials for making gears.
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