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6. Axis Specifications Parameters
6.2 Zero Point Return Parameters
73
6.2 Zero Point Return Parameters
After setting up the parameter (PR) listed in the table, turn off the NC power. To validate the
parameter, turn on the power again.
# Items Details
Setting range (unit)
2025 G28rap G28 rapid
traverse
feedrate
Set up a rapid traverse feedrate for dog type reference
point return command.
1 to 1000000
(mm/min)
2026 G28crp G28
approach
speed
Set up the speed of approach to the reference point in
the reference point return command. This speed is
attained after the system stops with deceleration by dog
detection.
(Note) The G28 approach speed unit is 10°/min only
when using the spindle/C-axis with the Z-phase
type encoder for the reference point return type
("#1226 aux10" bit3 = 1).
Note that this unit is applied to both micrometric
and sub-micrometric specifications.
1 to 60000
(mm/min)
2027 G28sft Reference
point shift
distance
Set up the distance from the electrical zero-point
detection position to the actual machine reference point
during reference point return.
0 to 65535 (µm)
2028 grmask Grid mask
amount
Set up a distance where the grid point is ignored when
near-point dog OFF signals are close to that grid point
during reference point return.
Near-point dog
Grid mask setup distance
The grid mask is valid by one grid.
0 to 65535 (µm)
Even for the
specifications in
sub-micrometric
system, set up the
value in units of
µ
m.
2029 grspc Grid interval Set up a detector grid interval.
Generally, set up the value equal to the ball screw pitch.
However, if the detector grid interval is not equal to the
screw pitch when measured with a linear scale, set up
the detector grid interval.
To reduce the grid interval, use its divisors.
To use 0.001 mm as minimum setup units, set up the
negative value.
Example) Setup value
−1 → 1.000 mm (°)
−1 → 0.001 mm (°)
Even when the specifications in sub-micrometrics are
used, 0.001 mm is specified for the minimum setup
units.
−32767 to 999
(mm)