
4. REFERENCE POSITION ESTABLISHMENT
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This function moves the tool near around the reference position set for
each axis in the manual continuous feed mode. Then it sets the reference
position in the reference position return mode without the deceleration
signal for reference position return by turning the feed axis and direction
select signal to “1”. With this function, the machine reference position can
be set at a given position without installing the limit switch for
deceleration for reference position return.
Also, if the absolute-position detector is provided, the set reference
position is retained after the power is turned off. In this case, when the
power is turned on again, there is no need for setting the reference position
again.
(1)Feed the tool, along the axis for which the reference position is to be
set, by manual continuous feed in the reference position return
direction. Stop the tool near the reference position, but do not exceed
the reference position.
(2)Enter manual reference position return mode, then set 1 for the feed
axis direction selection signal (for the positive or negative direction)
for the axis or reference position setting signal without DOG.
(3)The CNC positions the tool to the nearest grid line (based on
one–rotation signals from the position detector) in the reference
position return direction specified with bit 5 (ZMIx) of parameter No.
1006. The point to which the tool is thus positioned becomes the
reference position.
(4)The CNC checks that the tool is positioned to within the in–position
area, then sets the completion signal for reference position return and
the reference position establishment signal to 1.
The timing chart for the basic elements constituting steps (2) to (4) is
shown below.
4.2
SETTING THE
REFERENCE
POSITION WITHOUT
DOGS
General
Basic Procedure for Setting
the Reference P osition
Without Dogs