Installation manual
CNC 8035
MACHINE PARAMETERS
Spindle parameters
4.
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·159·
JERKLIM (P80)
Square-sine (bell shape) ramp acceleration. This type of ramp is used to gain in smoothness. This
spindle parameter becomes effective with RESET in machine parameters.
A JERKLIM value other than zero activates the square-sine ramp.
It comes in degrees/s
3
, in other words, a parameter value of 20 means a jerk of 20000 degrees/s
3
.
This parameter only affects the spindle acceleration in open loop (M3, M4, M5).
The parameter value so maximum acceleration (resulting from OPLACETI) is reached in half the
acceleration time up to MAXGEAR1 is calculated as follows:
JERKLIM = 6000 · MAXGEAR1 / OPLACETI
2
In this case, the spindle will take twice as long to reach the MAXGEAR1 speed than it would without
jerk.
The JERKLIM value depends on the dynamics of the machine.
ACCTIMET (P81) PROGAINT (P82) DERGAINT (P83)
FFGAINT (P84)
These parameters define the third set of gains and accelerations. They must be set like the
parameters that define the first set.
To select the third set of gains and accelerations, set g.m.p. ACTGAINT (P185) correctly or activate
the CNC’s general logic input ACTGAINT (M5063).
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.
Value Meaning
JERKLIM = 0 Linear acceleration ramp
Default value: 0
First set Second set Third set
ACCTIME (P18) ACCTIME2 (P47) ACCTIMET (P81)
PROGAIN (P23) PROGAIN2 (P48) PROGAINT (P82)
DERGAIN (P24) DERGAIN2 (P49) DERGAINT (P83)
FFGAIN (P25) FFGAIN2 (P50) FFGAINT (P84)
Possible values Meaning
0% - 30% Maximum override increment.
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.
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