·118·
Programming manual
CNC 8055
CNC 8055i
7.
ADDITIONAL PREPARATORY FUNCTIONS
·M· & ·EN· MODELS
SOFT: V02.2X
Look-ahead (G51)
7.4.1 Advanced look-ahead algorithm (integrating Fagor filters)
This mode is indicated when machining accuracy is required, especially if Fagor filters have been
set for the axes by machine parameters.
The advanced look-ahead algorithm calculates the feedrates at the corners so as to take the effect
of those filters into consideration. When programming G51 E, the contouring errors when machining
corners will be closer to the value programmed in that G51 function depending on the filters.
To activate the advanced look-ahead algorithm, use bit 15 of g.m.p. LOOKATYP (P160).
Considerations
• If there are no Fagor filters set by machine parameters in the axes of the main channel, activating
the advanced look-ahead algorithm will internally activate FIR filters of the 5th order and a
frequency of 30 Hz in all the axes of the channel.
• If there are Fagor filters set by machine parameters, activating the advanced look-ahead
algorithm will keep the values of those filters as long as their frequency is not higher than 30Hz
If their frequency is higher than 30 Hz, it will assume the values of 5th order and a frequency
of 30 Hz.
If there are several filters defined in the axes of the channel, the one with the lowest frequency
will be assumed as long as it is not higher than 30Hz.
• Even if the advanced look-ahead algorithm (using Fagor filters) is active with bit 15 of g.m.p.
LOOKATYP (P160), it will not start working in the following cases:
If g.m.p. IPOTIME (P73) = 1.
If any of the axes of the main channel has a.m.p. SMOTIME (P58) not equal to 0.
If any of the axes of the main channel has defined by parameter a non-Fagor type filter, a.m.p.
TYPE (P71) not equal to 2.
In these cases, when activating G51, the CNC will issue the corresponding error message.
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