
B-63323EN-1/03 9.SPINDLE FUNCTION
- 881 -
- Backlash compensation
In rigid tapping mode, backlash compensation is performed to
compensate for lost motion upon forward and reverse spindle rotation.
Set the amount of backlash compensation in parameter Nos. 5853 to
5874. For the tapping axis, backlash compensation is always
performed.
- Orientation
When the orientation function is used, the orientation stop position can
be shifted using the grid shift function. For analog spindles, the
position can be shifted within a range of 180 degrees depending on the
setting made in parameter No. 5980. For serial spindles, the position
can be shifted within the range 0 to 360 degrees depending on the
setting made in parameter No. 3073.
- Orientation speed
When an analog spindle is used, movement is made at a rapid traverse
rate set in parameter No. 5977 until a speed that allows orientation is
reached. After a one-rotation signal is detected, orientation is
performed at the FL feedrate set in parameter No. 5979.
* Speed that allows orientation
Set the speed so that the following condition is satisfied:
F: Feedrate (deg/min)
G: Position gain (1/sec)
P: Gear ratio between the spindle and position coder
If the above condition is not satisfied, the one-rotation signal cannot be
detected, so the spindle continues moving at the rapid traverse rate.
* FL feedrate
Set the FL feedrate so that the following condition is satisfied:
FL: Feedrate (deg/min)
G: Position gain (1/sec)
P: Gear ratio between the spindle and position coder
If the above condition is not satisfied, an accurate stop position cannot
be detected, so orientation is performed again starting from the rapid
traverse operation.
When a serial spindle is used, the orientation speed is determined by
the spindle.
When orientation is specified, a serial spindle stops immediately at the
orientation position; while an analog spindle first moves at a rapid
traverse rate then at the FL feedrate, then stops at the orientation
position. With serial spindles, therefore, the restriction imposed on the
lower limit of the rapid traverse rate setting to achieve the speed for
orientation, imposed when an analog spindle is used, is eliminated.
)pulses( area effective Spindle
088.0G60
PFL
1024 ≥
××
×
≥
088.060
1024 pulses
G
PF
≥
××
×
≥