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In the milling operation, most of the indexing can be solved by the simple indexing method. When the number of teeth Z and 40 of the workpiece are not met, or the phase of the 40 is about the same, there is no required hole on the indexing plate. For example: 61, 63, When 79, 101, 109, 126, 127, etc. are used, the differential indexing method must be used. However, the differential indexing method also has its limitations. When it comes to machining helical gears or straight bevel gears of the number 61, 63, 79, etc., due to the indexing head side shaft and the table longitudinal screw Having been installed
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