GSK GSK983Ma, Руководство пользователя

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GSK983Ma Milling Machine Center CNC System User Manual
136
Part 1 Programming
Fig. Initial position and point R
3.7.4 Rigid tapping cycle (G180, G184)
3.7.4.1 Brief
The rotation of the spindle and the feedrate of the Z axis are separately controlled in the general
tapping cycle G74/G84, and the acceleration/deceleration of the spindle and feed axis are also
treated individually, so, it is hard to content the abovementioned conditions strictly, especially when
the tapping has been reached to the bottom of the hole. It hardly meets the above conditions when
the spindle and feed axis are decelerated to stop, and then accelerated to the reverse rotation.
Generally, the accuracy of the tapping can be improved by the feed of which the flexible spring
compensation feed axis is installed inside the tool chuck. The rotation of the spindle and the feed of
the feed axis are always held when the rigid tapping is cycled. That is to say, the rotation of the
spindle is carried out not only speed control, but also position control. The rotation of the spindle and
the feed of the tapping axis should be performed the straight-line interpolation. The
acceleration/deceleration machined at the bottom of the hole must be met the following conditions to
enhanced the accuracy of the rigid tapping.
The rigid tapping does not use the floating screw-tap chuck which in the tapping cycle mode
(G84/G74), which is machined by the rigid connection screw-tap. In this case, the faster and the more
accuracy tapping can be gained.
3.7.4.2 Command format
G98/G99 G90/G91 G184 X Y Z R Q F M3/M4 S___
G98: Returning to the initial position after tapping (It should be defined before the G184)
G99: Returning to the point R after tapping (It should be defined before the G184)
G90: Programming with the absolute coordinate (It should be defined before the G184)
G91: Programming with the incremental coor