Fagor CNC 8055i, Installation Manual

Page: 193 / 732

Installation manual
CNC 8055
CNC 8055i
MA
CHINE PARA
METERS
6.
S
OFT
: V02.2
X
·193·
Genera
l ma
chine
p
a
rameters
2. Advanced jerk control algorithm: use bit 0 of general parameter LOOKATYP (P160) to activate it.
Recommended for large and/or slightly rigid machines. When using this algorithm, machining
smoothness is more important than speed.
Other bits of general parameter LOOKATYP (P160) compatible with the algorithm with jerk
control are:
Bit 12: speed control in arcs made up of linear blocks. Recommended for accurately machining
small radius arcs made up of small linear blocks.
Bit 13: using FAGOR filters during look-ahead.
The value of general parameter LOOKATYP (P160) recommended when using the algorithm
with jerk control is: 0001 0000 0000 0001.
3. Standard algorithm: bits 0 and 15 of general parameter LOOKATYP (P160) to 0.
With the standard algorithm, the machining result is intermediate. The standard algorithm is
slightly slower than the advanced one and less accurate, but smoother.
When compared to the algorithm with jerk control, it is faster but less smooth.
Other bits of general parameter LOOKATYP (P160) compatible with the standard algorithm are:
Bit 12: speed control in arcs made up of linear blocks. Recommended for accurately machining
small radius arcs made up of small linear blocks.
Bit 13: using FAGOR filters during look-ahead.
Bit 14: Smoothing while machining.
The value of general machine parameter LOOKATYP (P160) recommended when using the
standard algorithm is: 0101 0000 0000 0000.
Here is a description of each bit of general parameter LOOKATYP (P160) and the compatibility
between them.
This parameter has 16 bits counted from right to left.
Each bit has a function or work mode associated with it. By default, all the bits will be assigned the
value of ·0·, except bits 12, 14 and 15 that will be assigned a value of ·1·. Assigning the value of
·1· activates the corresponding function.
Bit 0. It activates the algorithm with jerk control during look-ahead.
Using jerk in look-ahead, a trapezoidal acceleration profile is applied with a ramp slope calculated
using the maximum jerk of the axes involved in the programmed path. Maximum jerk depends on
the value given to the axis parameter JERKLIM (P67) of those axes.
For the axes whose axis parameter JERKLIM (P67) has been set to 0, the CNC assumes the jerk
value recommended for that parameter.
Bit 12. It enables the speed control in arcs with linear blocks in look-ahead.
This provides more accurate and smoother machining when machining arcs of a small radius
programmed with linear blocks (G1).
This function could extend machining time slightly.
This speed control may be applied with the standard look-ahead algorithm, with the advanced look-
ahead algorithm or with Jerk control. Plus, it takes into account the limitation set by axis parameters
JERKLIM (P67) in arcs formed by linear blocks when using the jerk control algorithm.
Bit Meaning
0 It may be used to apply jerk control in look-ahead.
1...11 Not used.
12 It activates/deactivates the speed control in arcs with linear blocks in look-ahead.
13 It makes it possible to use Fagor filters with Look-ahead (standard look-ahead algorithm
and with jerk control).
14 Activates/deactivates smoother machining.
15 It activates/deactivates the advanced look-ahead algorithm (integrating Fagor filters).
bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0