7
LP2 probe moves
With a double touch sequence, the rst move
nds the surface quickly, then the probe is
reversed to a position clear of the surface before
making the second touch at a slower feedrate,
thereby recording the surface position at a higher
resolution.
Probe trigger
A probe trigger signal is generated when the
probe’s stylus is driven against a surface. The
machine control records the contact position and
instructs the machine motion to stop.
Although high probing speeds are desirable, it is
essential to choose a probing velocity which allows
the machine to stop within the limits of stylus
overtravel and machine measuring capability.
Follow feedrate guidelines given by the supplier.
To ensure a trigger signal is generated, drive the
probe against the workpiece to a target beyond
the expected surface, but within the limits of stylus
overtravel.
After the probe stylus touches the surface, reverse
clear of the surface.
Single and double touch
If the probe operating sequence is based on a
single touch, then, following a gauging move, the
probe may be returned to its start point.
With some types of controllers, it is an advantage
to use a double touch method as poor repeatability
can result from using higher feedrates.
Z
1
Start position
Overtravel limits (see page 10)
2
X/Y
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