Machine tool with tapping function
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United States of America Patent
Stats
-
Jul 23, 1996
Grant Date -
N/A
app pub date -
Feb 15, 1995
filing date -
Feb 17, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a machine tool equipped with a numerical control unit for digitally controlling a spindle motor, the number of revolutions and feed speed of a spindle for rigid tapping are obtained by designating the number of revolutions and the tapping pitch from an input device and calculating the feed speed of the spindle by an arithmetic device based on the designated number of revolutions and tapping pitch. Alternatively, they are obtained by designating the tapping pitch from the input device, changing the number of revolutions by a number-of-revolutions changing device and calculating the feed speed of the spindle by the arithmetic device based on the designated pitch and the changed number of revolutions. The numerical control unit controls the number of rotations of the spindle motor based on the obtained number of revolutions and also controls the axial feed of the spindle based on the obtained feed speed, thus synchronizing the number of revolutions of the tap with the feed speed of the tap with respect to the work during the tapping operation.
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