
B–63522EN/02
6. REFERENCE POSITION
NC FUNCTION
93
For reference position return using the grid method, you can shift the
reference position without having to move the deceleration dog, simply
by setting the amount of shift in a parameter.
The time required to adjust the reference position is thus greatly reduced
because the deceleration dog need not be adjusted.
Deceleration dog
L
DEC
L
SFT
Grid point
Machine
zero point
L
SFT
: Reference position shift
L
DEC
: Distance the tool moves between the deceleration dog being
turned off and the first grid point encountered subsequently
(grid point when the reference position shift is 0)
(L
DEC
is displayed on the diagnostic screen.)
Direction of reference
position return
The butt–type reference position setting function automates the setting of
a reference position by butting the tool against a mechanical stopper on
an axis. This function is provided to eliminate the variations in reference
position setting that arise when the procedure is performed by different
operators, and to minimize the amount of work involved in making fine
adjustments after reference position setting.
Select the axis for which the reference position is to be set, then perform
cycle start. The following operations are performed automatically:
1. The torque (force) of the selected axis is reduced so that the butting
feedrate is constant. The tool is butted against the mechanical stopper.
Then, the tool is drawn back a parameter–set amount from the
mechanical stopper.
2. Again, the torque (force) of the selected axis is reduced, then the tool
is butted against the mechanical stopper. Then, the tool is drawn back
a parameter–set amount from the mechanical stopper.
3. The point on the axis to which the tool is drawn back is set as the
reference position.
6.7
REFERENCE
POSITION SHIFT
6.8
BUTT–TYPE
REFERENCE
POSITION SETTING