Machine tool with tapping function

Details Machine tool with tapping function Machine tool with tapping function

1995-02-15

1996-07-23

Howell, Daniel W.

Cutting by use of rotating axially moving tool

With means to regulate operation by use of templet, tape,...

36447402, 36447412, 408 10, 470 96, B23G 118

Patent

active

055383696

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.

REFERENCES:
patent: 4692071 (1987-09-01), Hirota
patent: 5062744 (1991-11-01), Nakamura et al.

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