
14. MEASUREMENT
B–63523EN–1/02
1672
Determine a specific point on the machine tool as the measuring reference
position. In advance, set the distance from this point to the measuring
position (contact face of the touch sensor) as a reference value, using
parameter No. 5015 to 5018. Select the tool whose offset value is to be
measured, and bring it to touch the sensor, receiving a contact detection
signal (tool compensation value write signal). The mechanical coordinate
value is the distance from the tool nose position of the measuring tool at
the mechanical reference (home) position to the measuring position; set
the difference between this value and the reference value (parameter
setting) into the tool offset value memory as the tool geometry offset
value. The corresponding tool wear offset value becomes 0.
(Tool offset value to be set)
=
(Mechanical coordinate value when tool compensation value write
signal has become “1”) – (Reference value (parameter value)
corresponding to the tool compensation value write signal)
The tool offset value to be set differs according to the method of
determining the measuring reference position.
If touch sensor contact detection is based on a one–contact input (the TS1
parameter (bit 3 of parameter No. 5004) is 1), when a contact detected
signal (tool compensation amount write signal +MIT1) is received from
the touch sensor, which of the two directions of each axis is involved is
automatically determined according to several pulses stored as a result of
the axis movement that was made before the signal reception. So the
number of interpolation cycles related to the stored pulses must
previously be set in parameter No. 5021.
Once which of the two directions of each axis is involved is automatically
determined, the corresponding axis direction is subjected to axis interlock
to stop feeding, and the obtained tool compensation amount is stored in
tool compensation memory.
If the directions of stored pulses are not unified, or no pulse has been
stored, for example, because the servo power has been shut off (servo off)
or no axis movement occurred, a P/S alarm (No. 5195) is issued.
A P/S alarm is issued also if the tool moves along two axes (X–axis and
Z–axis) simultaneously; move the tool along one axis at a time.
If a P/S alarm is issued, no tool compensation amount will be set up,
resulting in the four directions (two axes) being subjected to interlock.
D Setting tool offset value
If touch sensor contact
detection is based on a
one–contact input