Screw cutting control system
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United States of America Patent
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-
Feb 18, 1986
Grant Date -
N/A
app pub date -
Jun 14, 1982
filing date -
Oct 17, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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