| 摘要 |
PCT No. PCT/JP81/00288 Sec. 371 Date Jun. 14, 1982 Sec. 102(e) Date Jun. 14, 1982 PCT Filed Oct. 16, 1981 PCT Pub. No. WO82/01336 PCT Pub. Date Apr. 29, 1982.The present invention increases screw cutting accuracy and simplifies the control of a screw cutting control system which performs screw cutting through the use of a numerically-controlled machine tool. A tapper (TPP) connected to a spindle, holds a tap (TAP) in a manner to be movable in the axial direction of the spindle, transmits the rotation of the spindle to the tap (TAP) for a predetermined range of forward axial movement of the tap (TAP) and transmits the rotation of the spindle to the tap (TAP) when the spindle is reversed. During screw cutting, feed by a feed motor (SZ) stops after the tap (TAP) enters a workpiece and the screw cutting is effected by the thrust of the tap itself resulting from the rotation of the spindle. The sequence of screw cutting is commanded by one block of command data.
|
