Fagor CNC 8055i, Installation Manual

Page: 261 / 732

Installation manual
CNC 8055
CNC 8055i
MA
CHINE PARA
METERS
6.
S
OFT
: V02.2
X
·261·
Spindle parameters
THREAOVR (P85)
When beginning to machine long threads on large lathes, the part usually "bends". To prevent this,
it is possible to change the spindle override in the first passes. This parameter affects canned cycles
G86 and G87 while machining the thread.
A value of 30 means that the override may be varied between 70% and 130%.
In spite of this, the limits set for the spindle with spindle machine parameters MINSOVR (P10) and
MAXSOVR (P11), can never be exceeded. On the other hand, it will not be possible to vary the
override in the last threading pass, it will be set to the value imposed in the previous threading pass.
Spindle machine parameter M19TYPE (P43) must be set to "1" in order for the override to work while
threading.
OPLDECTI (P86)
Indicates the duration of the spindle deceleration ramp in open loop.
The spindle parameter OPLDECTI (P86) works on the first and second spindle.
If OPLDECTI (P86) = 0, spindle parameter OPLACETI (P45) will be applied both for acceleration
and deceleration.
If spindle parameter JERKLIM (P80) other than 0 and spindle parameter OPLDECTI (P86) other
than 0, parameter JERKLIM will be applied for deceleration.
Possible values Meaning
0% - 50% Maximum increment allowed via override switch.
Default value: 0 (the override cannot be varied while threading)
In order not to damage the thread when varying the override, the feed-forward value of the axes must
be close to 100% so as to work with a near-zero following error.
Possible values
Integers between 0 and 65535 ms.
Default value: 0.
P45=0
P86 P45