In general, gears with an accuracy of 8 or higher require centering accuracy. Therefore, the flat key should be used to connect the shaft. Select the double flat head common flat key (type A) [17]. According to the diameter of the shaft end, according to the reference [17], the section size of the key is: width b = 5mm, height h = 5mm, because the width of the gear is only 5mm, the length of the flat key selected is 10 mm.<br>
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