Ensuring the accuracy of the split is one of the important factors to improve the accuracy of the worm machining. Experience has shown that the use of the exchange gear splitting method can achieve higher split accuracy. In single or small batch production, this method can save special tools and is easy to operate. C620-1 lathe exchange gear transmission ratio l=Z_1/Z_3=32/97 (Fig. 1), when the lathe spindle rotates one turn, the gear z_1 rotation number n is 1, 2, 8, 32 (this number depends on the worm
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