It is often encountered in machining, such as machining sub-holes, slots and racks. It is more troublesome to use the block gauge to select the stacking method. Therefore, we use the universal indexing head with the hanging wheel to index and control the pitch of the rack. If the long rack with m=2 is processed, the indexing of the indexing head is used, and the theoretical pitch error can be less than 0.00001mm.
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