not the intended result either.
By correcting the combination of bead gun mechanical delay time plus bead drop
time with a time factor, the vehicle speed is no longer part of the equation, and
bead registration will be much more reliable at varying vehicle speeds. Typically
at this point, the only remaining variable* is wind speed, which can be corrected
for using the Bead Offset parameter on the main screen during striping
operations.
* Some bead gun styles may also be affected by variations in pneumatic air pressure
systems.
5.2.2 Datum Point Correction
When striping first starts, there is no time for the skip timer to turn on the bead
guns before the paint guns to ensure proper registration. This means that the
first few feet of markings are not covered with beads.
By enabling Datum Point and setting the Datum Offset to some distance in front
of the guns, this provides the skip timer with enough time to accurately account
for required paint and bead timings.
It is recommended to attach a flag or identifier to the vehicle at the desired
datum point. Then, measure from the datum point to the front material gun, as
shown in the illustration below:
SC-12 Road Marking Control System - Installation and Operation Manual
55
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