Fagor 8025 T CNC, Operating Manual

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8025/8030 CNC PROGRAMMING MANUAL 105
b) Setting of max. spindle S value when working at Constant Surface Speed (G96).
By means of the block N4 G92 S4 the max. spindle speed is limited to the value set
by S4 (in rpm).
The CNC calculates at all times the spindle rpm required to achieve the programmed
constant surface speed in meters/minute or feet/minute.
If the calculated spindle rpm is greater than the maximum set by G92 S4, the CNC will
limit it to this maximum value.
6.30. G93. Polar origin preset
Function G93 can be used to preselect any point in a plane (XY,XZ,YZ) as the origin of
polar coordinates.
There are two ways of preselecting an origin of polar coordinates:
a) G93 I+/-4.3 K+/-4.3 (always absolute coordinate values).
or, G93 I+/-3.4 K+/-3.4
I+/-4.3: Indicates the value of the abscissa
I+/-3.4: of the polar coordinate origin; i.e. the value of X.
K+/-4.3:Indicates the value of the ordinate
K+/-3.4:of the polar coordinate origin; i.e. the value of Z
No more information can be programmed in this block, when programming the
presetting of polar origin in this way.
b) The programming of G93 in a block determines that, prior to the movement program-
med, the actual position of the tool becomes the polar origin.
Atention:
When a circular interpolation is programmed with G02,G03, the CNC
assumes the arc’s center as the new polar origin.
On power-up or after M02,M30,EMERGENCY or RESET, the CNC
takes the point (X0,Z0) as the polar origin.