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Installation manual
CNC 8055
CNC 8055i
CONC
EPTS
7.
S
OFT
: V02.2
X
·421·
Compen
sati
on of the
e
lastic deformation in
the
cou
p
lin
g of
a
n
a
x
is
Conclusions:
The elastic deformation on the axis of a machine is directly proportional to the acceleration and when
its dynamics is a circular path, it is also directly proportional to the square of the feedrate.
Therefore, the higher the relative feedrate between the tool tip and the table, the more significant
the elastic deformation will be.
Machining a part following a circular path at low feedrate considering the elastic deformation only
on one axis or on both implies practically getting the desired circular path because the path deviation
suffered on the axes will be very small. It will not be a perfect circle, but, in practice, it will not be
necessary to compensate for elastic deformation.
Machining a part following a circular path at high feedrate considering the elastic deformation only
on one axis or on both implies getting an elliptic path because the path deviation suffered on the
axes will be considerable. The other main radius of the ellipse will be the same as the radius of the
circular path when assuming that there was no elastic deformation on the other axis. Considering
elastic deformation on both axes will also result in an elliptic path where none of the two main radii
coincides with the radius of the programmed circular path.
To offset these deformations, set machine axis parameter DYNDEFRQ (P103) for each axis with
the value of the resonance frequency of its elastic coupling.
Remarks:
Before compensating the elastic deformation, the CNC will always display a circular path, not
elliptical as could be expected because there is elastic deformation.. The motor feedback is placed
before the elastic coupling and does not register the path deviation due to elastic deformation at all.
After compensating the elastic deformation, the CNC will always display an elliptical path, not
circular as could be expected after compensating the elastic deformation..
Resonance frequency of the elastic coupling
From the formula of the oscillation frequency of a simple harmonic movement (s.h.m.) it is possible
to obtain its relationship with acceleration and deformation through this equation:
For a circular path, the
x deviation with respect to R may be obtained directly by measuring the
part that has been previously machined.
The acceleration of the system is calculated from the formula shown earlier:
With these values, now determined, the formula of the frequency provides the value for setting
machine axis parameter DYNDEFRQ (P103) to offset the elastic deformation caused on that axis.
f
1
2
------
k
m
----
1
2
------
a
x
------
=
=
a
F
60
2
R
---------------------
=
Summary of Contents for CNC 8055i
Page 1: ...CNC 8055 Installation manual Ref 1705 Soft V02 2x...
Page 8: ...8 Installation manual CNC 8055 CNC 8055i SOFT V02 2X...
Page 12: ...18 CNC 8055 CNC 8055i Declaration of conformity and Warranty conditions...
Page 16: ...10 CNC 8055 CNC 8055i Version history...
Page 22: ...16 CNC 8055 CNC 8055i Returning conditions...
Page 24: ...20 CNC 8055 CNC 8055i Additional notes...
Page 26: ...22 CNC 8055 CNC 8055i Fagor documentation...
Page 72: ...72 Installation manual CNC 8055 CNC 8055i 1 8055 CNC CONFIGURATION SOFT V02 2X Operator panel...
Page 227: ...Installation manual CNC 8055 CNC 8055i MACHINE PARAMETERS 6 SOFT V02 2X 227 Axis parameters...
Page 290: ...290 Installation manual CNC 8055 CNC 8055i 6 MACHINE PARAMETERS SOFT V02 2X Tables...
Page 474: ...474 Installation manual CNC 8055 CNC 8055i 10 PLC PROGRAMMING SOFT V02 2X PLC library...
Page 644: ......
Page 652: ...652 Installation manual CNC 8055 CNC 8055i B SOFT V02 2X Central unit of the 8055 CNC...
Page 654: ...654 Installation manual CNC 8055 CNC 8055i C SOFT V02 2X 11 LCD Monitor...
Page 656: ...656 Installation manual CNC 8055 CNC 8055i D SOFT V02 2X Probe connection at the 8055i...
Page 658: ...658 Installation manual CNC 8055 CNC 8055i E SOFT V02 2X Probe connection at the 8055 CNC...
Page 681: ...Installation manual CNC 8055 CNC 8055i J SOFT V02 2X 681 Key code MC operator panel...
Page 682: ...682 Installation manual CNC 8055 CNC 8055i J SOFT V02 2X Key code...
Page 683: ...Installation manual CNC 8055 CNC 8055i J SOFT V02 2X 683 Key code TC operator panel...
Page 684: ...684 Installation manual CNC 8055 CNC 8055i J SOFT V02 2X Key code...
Page 685: ...Installation manual CNC 8055 CNC 8055i J SOFT V02 2X 685 Key code MCO TCO operator panel...
Page 686: ...686 Installation manual CNC 8055 CNC 8055i J SOFT V02 2X Key code Alphanumeric keyboard...
Page 687: ...Installation manual CNC 8055 CNC 8055i J SOFT V02 2X 687 Key code 11 LCD Monitor...
Page 688: ...688 Installation manual CNC 8055 CNC 8055i J SOFT V02 2X Key code...
Page 692: ...692 Installation manual CNC 8055 CNC 8055i K SOFT V02 2X Logic outputs of key status...
Page 694: ...694 Installation manual CNC 8055 CNC 8055i K SOFT V02 2X Logic outputs of key status...
Page 698: ...698 Installation manual CNC 8055 CNC 8055i K SOFT V02 2X Logic outputs of key status...
Page 702: ...702 Installation manual CNC 8055 CNC 8055i L SOFT V02 2X Key inhibiting codes...
Page 704: ...704 Installation manual CNC 8055 CNC 8055i L SOFT V02 2X Key inhibiting codes...
Page 707: ...Installation manual CNC 8055 CNC 8055i L SOFT V02 2X 707 Key inhibiting codes 11 LCD Monitor...
Page 708: ...708 Installation manual CNC 8055 CNC 8055i L SOFT V02 2X Key inhibiting codes...
Page 722: ...722 Installation manual CNC 8055 CNC 8055i N SOFT V02 2X M functions setting chart...
Page 728: ...728 Installation manual CNC 8055 CNC 8055i Q SOFT V02 2X Maintenance...
Page 729: ...Installation manual CNC 8055 CNC 8055i Q SOFT V02 2X 729...
Page 730: ...730 Installation manual CNC 8055 CNC 8055i Q SOFT V02 2X...
Page 731: ......