Fagor CNC 8070, Programming Manual, Page: 141 / 556

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Programming manual
CNC 8070
TOOL PAT
H
CONTROL
Ci
rc
ul
ar
i
n
te
rp
ol
a
ti
on
(G
02
/G
03)
6.
(S
OFT
V02.0
X
)
107
6.3.6 Arc center correction (G264/G265)
In order to execute the programmed arc, the CNC calculates the radii
of the initial and final points which must be the same. When this is not
the case, using center correction it is possible to execute the
programmed arc by correcting its its center.
The tolerance allowed for the difference between both radii or for
locating the corrected arc center is set by the machine manufacturer
[G.M.P. "CIRINERR" and "CIRINFACT"].
Programming
Arc center correction may be turned on and off using the following
functions:
G264 Cancellation of arc center correction.
G265 Activation of arc center correction.
G264 Cancellation of arc center correction
When the difference between the initial and final radii is within the
allowed tolerance, it executes the arc with the radius calculated using
the initial point. The center position stays the same.
If the difference between both radii exceeds the allowed tolerance, the
relevant error message will be issued.
G265 Activation of arc center correction.
If the initial and final arc radii are not the same, the CNC tries to
calculate a new center within the set tolerance so as to be able to
execute and arc between the programmed points as close as possible
to the defined arc.
To calculate whether the error margin is within tolerance or not, the
CNC considers two values:
• The absolute error (radius difference).
• The relative error (% over the radius).
If any of these values is within the tolerance set by the OEM, the CNC
corrects the center position.
If the CNC cannot the center within those limits, it will issue the
pertinent error message.
Properties of the functions
Functions G264 and G265 are modal and incompatible with each
other.
O n p ower-up, after executing an M02 or M 30, and after a n
EMERGENCY or RESET, the CNC assumes function G265.