| 摘要 |
A thread-cutting machine, of the type which includes a longitudinal carriage whose reciprocal movements are obtained from a first cam, called pitch cam, a transverse carriage carrying a tool and whose reciprocal movements are obtained from a second cam, called forward and backward movement cam, and means for ensuring the progression of the tool towards the work piece during successive threading cuts is characterized in that the tool progression means are formed by a numerical control motor capable of ensuring the transverse movement of the forward and backward movement cam and a third cam is operatively connected between the pitch cam and forward and backward movement cam for synchronizing the reciprocal movement of the forward and backward movement cam with the pitch cam.
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