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2.6
Description
Getting Started
Adjusting Working Offsets during Production
As with stringline guidance, during operation the machine will require periodic adjustment
of elevation and/or position due to external influences such as material characteristic
changes, (e.g. wet or dry concrete with varying slump or mix design, asphalt temperature
change), or milling/trimming drum wear. It is also very important to take into account slight
errors within the project coordinate system – due to survey fixpoint errors, instrument cali-
bration age, length of time an instrument is setup at one location, measurement range and
atmospheric effects (e.g. temperature-cycling during the working period, pressure,
humidity).
The importance of as-built checks (see "2.9 Taking As-Built Measurements") and good
survey practice cannot be overstated; these will ensure any subtle errors and/or external
influences do not impact on the accuracy and quality of the paving/milling process.
Adjustments to Working Offsets should only be made gradually, and after noticing
a trend in one direction (e.g. a gradually increasing elevation error) over a number
of measurements.
As with stringline guidance, it is strongly recommended any adjustments to Elevation
Working Offsets be by only 1mm (0.003') per 1 metre (3ft) of travel, to avoid undesired
"steps" in the concrete, or the machine to "sit" on the fresh material. Smooth adjustment
is the key to a quality finished product.
PaveSmart 3D UM 49
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