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Probe moves
Probe trigger
A probe trigger signal is generated when the
probe’s stylus is driven against a surface. The
machine’s control records the contact position and
instructs machine motion to stop.
To ensure a trigger signal, drive the probe against
the workpiece to a target beyond the expected
surface, but within the limits of stylus overtravel.
After the probe’s stylus touches the surface,
reverse clear of the surface.
Single and double touch probing
If the probe operating sequence is based on a
single touch, then the probe is returned to its start
point following a measuring move.
On some types of controller, it is desirable to
use a two touch method, as poor accuracy and
repeatability can result at higher feed rates.
With a double touch sequence, the first move finds
the surface quickly. The probe is then backed off to
a position clear of the surface before making the
second touch at a slower feed rate. This records
the surface position at a higher resolution.
Probe measuring speed
The probe system’s transmission delay time is
small and constant. Normally, it does not limit the
probing speed because it is cancelled out during
calibration of the probe on the machine tool.
High probing speeds are desirable. However, if
used, a probing velocity must be chosen which
allows the machine to stop within the limits of
stylus overtravel and the measuring capabilities of
the machine.
Probe moves
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