Basic gear design
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At Marples Gears, we also use software in order to analysis the gear tooth profile of your part.
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Marples Gears specializes in high precision fine pitch gear manufacture up to Q13 quality standard on our gear products that we custom manufacture in house. While this method is able to generate the profile of the gear, the firm would still need some supplementary dimensions in order to accurately reverse engineer said part. This method is used in order to reverse engineer gears that may need to be replaced by the original part’s manufacture is no longer capable of manufacturing that part. Many gear manufacturing firms also have the ability to determine the gear profile from the geometry of the hobs that is used to generate the teeth on a gear. An advantage to making a rack form is strength obtained through the rack form. The gear tooth profile also varies by the number of teeth on the gear such that the larger the amount of teeth the straighter the profile of the gear eventually forming what is called a rack gear. These factors are determined by the desired contact ratio between mating parts of the gear. The tooth thickness, diametral pitch and pressure angle all go into determining the gear tooth profile. The tangent line of the base circle of the gear and the base circle of the pinion form the line of action for the gear set. The involute gear tooth profile also helps with smooth rotation even with variations in the center distances between the gear and the pinion. The contact point of the gear and pinion goes along the involute curves of the gears. The base circle of the involute curve is also important because it helps to determine the pressure angle of the gear, another fundamental of gear design. The curve is produced by wrapping a string around a cylinder, the base circle, and as it is unwrapped from this cylinder traces the involute curve. This involute curve helps the gears transmit power smoothly during the rolling action. There are other types of gear profiles, but they are mainly utilized in specialty applications such as cycloidal gears in clocks and watches. Gears generally have an involute curve tooth profile. One of the fundamental s of gear design is the profile of the gear tooth.