Importance

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Abstract

A CNC lathe comprising two opposed spindle stocks (2a, 2b) and two turret type tool rests (3a, 3b), in which a base (1) is of a slant type, the first spindle stock (2a) is secured to the base (1), the second spindle stock (2b) is provided to be capable of being moved and located only in a direction to the spindle, and both the tool rests (3a, 3b) are arranged in the deep side of the spindle stocks (2a, 2b). The CNC lathe having said construction in which both spindle stocks include an independent spindle motor (21), a spindle indexing and driving device (23) capable of mechanically releasing connection, and encoders (27, 26) on the side of the spindle, and the indexing and driving device wherein an index motor (40) is rotated on the basis of a phase difference detected by the encoder to match a phase when the spindle indexing and driving device (23) is connected to the spindle 11), so when a work (16) is delivered between both the spindles (2a, 2b). The CNC lathe having said construction comprising a synchronous control device (53) for cutting the output pulses of the encoders 27 mounted on both the spindles through a fine time unit to correct a speed command according to large and small relation therebetween. This invention provides a CNC lathe in the rigidity of the first spindle stock is high, a bar feeder having a conventional construction can be used, and efficiency for working the work including indexing working by both the spindles and efficiency for working a bar material which requires cutting-off when the work is delivered between both the spindles are enhanced much.

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First Claim