Programming manual
CNC 8055
CNC 8055i
PATH CONTROL
6.
·M· & ·EN· MODELS
SOFT: V02.2X
·89·
Circular interpolation (G02, G03)
If P0 is the starting point and P1 the endpoint, there are 4 arcs which have the same value passing
through both points.
Depending on the circular interpolation G02 or G03, and on the radius sign, the relevant arc is
defined. Thus the programming format of the sample arcs is as follows:
Arc 1 G02 X.. Y.. R- ..
Arc 2 G02 X.. Y.. R+..
Arc 3 G03 X.. Y.. R+..
Arc 4 G03 X.. Y.. R- ..
Execution of the circular interpolation
The CNC calculates, depending on the programmed arc, the radii of the starting point and endpoint.
Although both of them should be "exactly" the same, general parameter "CIRINERR" allows a
certain calculation tolerance by establishing the maximum difference between these two radii. When
exceeding this value, the CNC will issue the corresponding error message.
In all these programming cases, the CNC checks that the center or radius coordinates do not exceed
214748.3647mm. Otherwise, the CNC will display the corresponding error.
The programmed feedrate "F" may vary between 0% and 120% via the switch located on the Control
Panel of the CNC, or by selecting between 0% and 255% from the PLC, or via the DNC or the
program.
The CNC, however, is equipped with the general machine parameter "MAXFOVR" to limit maximum
feedrate variation.
If the general machine parameter "PORGMOVE" has been selected and a circular interpolation
(G02 or G03) is programmed, the CNC assumes the center of the arc to be a new polar origin.
Functions G02 and G03 are modal and incompatible both among themselves and with G00, G01,
G33 and G34. Functions G02 and G03 can be programmed as G2 and G3.
Also, function G74 (home search) and G75 (probing) cancel the G02 and G03 functions.
On power-up, after executing M02, M30 or after EMERGENCY or RESET, the CNC assumes code
G00 or G01, depending on how general machine parameter "IMOVE" has been set.
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