Probe Moves - Renishaw MP12 Manuel D'installation Et D'utilisation

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PROBE TRIGGER
A probe trigger signal is generated when the
probe stylus is driven against a surface. The
machine control records the contact position
and instructs machine motion to stop.
To ensure a trigger signal is given, 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 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
reversed to a position clear of the surface,
before making the second touch at a slower
feed rate, thereby recording the surface
position at a higher resolution.
PROBE MEASURING SPEED
The probe system transmission delay time is
small and constant and does not normally
limit the probing speed, because it is
cancelled out during calibration of the probe
on the machine tool.
High probing speeds are desirable, however,

PROBE MOVES

Probing cycles are available from Renishaw
a probing velocity must be chosen which allows the machine
to stop within the limits of stylus overtravel and measuring
capability of the machine.
CALIBRATING A SYSTEM
Calibration should be done in the following circumstances:
1. Before the system is used
2. When a new stylus is used.
3. If the stylus is bent.
4. To allow for machine thermal growth.
5. Poor relocation repeatability of the probe holder.
It is important that calibration cycles are run at the
measuring cycle feed rate to cancel out system errors.
Make measurements in every measuring direction to provide
complete calibration data for the measuring cycles.
X/Y X/Y