In machining, it often encounters the processing of a small lead helical cam, as shown in Figure 1, a double helix cam with a lead of 3 mm. In the absence of special equipment, according to the usual processing method, the workpiece needs to be clamped on the indexing head on a common milling machine, and the rotary motion of the indexing head spindle is linked with the linear motion of the table by the hanging wheel. . In this way, a two-degree head is required, the indexing head II is used for speed increasing, the indexing head I is used for clamping and indexing, and a pair of teeth are used between the two indexing heads.
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