15 Special Transformations
15 Special Transformations
15.1 Coordinate System Rotation (G68, G69)
A programmed shape can be rotated in the plane selected by G17, G18, G19 by the use of command
G68 p q R
The coordinates of the center of rotation will be specified at address p and q. The system will only interpret the data written at coordinates p and q of the selected plane.
The entered p and q coordinate data are also interpreted as rectangular coordinate data even when polar coordinate data specifications are set up. Using G90, G91 or operator I, the p and q coordinates of the center of rotation can be specified as absolute or incremental data.
Unless one or both of p and q are assigned values, the instantaneous axis position will be taken for the center of rotation.
Fig.
The angle of rotation is specified at address R. A positive or |
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negative value written at the address R represents a counter- |
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clockwise or a clockwise direction of rotation, respectively. |
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The value of R can be specified in 8 decimal digits. The |
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accuracy of rotation can be selected with reference to |
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parameter ANG.ACCU. If its value is 0 or 1, the accuracy |
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of calculating the rotation will be 0.001° or 0.00001°, |
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respectively. |
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The value specified for R may be absolute or incremental. |
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When the angle of rotation is specified as an incremental | Fig. |
data, the value of R will be added to the previously |
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programmed angles. |
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The rotation can be canceled with command G69.
The coordinates of the center of rotation and the angle will be deleted. That instruction may accompany other commands as well.
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