HAMAR LASER STEALTH Series, General Training Manual

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58
13. Since the laser generates a plane,
rolls at any elevation in that
section that are within 2 ft. (610
mm) horizontally of the laser
plane can be measured for
parallelism without changing the
setup of the laser.
Remote Buck-in Formula
Often in Roll Alignment, the laser has to be far from the edge of the machine. In this case, the normal
buck-in process does not work very well. To circumvent this, we use the Remote Buck-in Formula:
Set Point = -1 * (D1/D2) * Far Reading, where:
D1 = distance from laser base to Near Point target location on the roll.
D2 = distance from the Near Point target location to the Far Point target location on the roll.
Far Reading = the value in the PDA with the target zeroed at the Near Point and moved to the
Far Point.
After calculating the Set Point, put the target back on the Far Point. Then adjust the L-742 Yaw Axis
until the target value equals the Set Point. When you move the target back to the Near Point, you will see
the reading is the same as the Set Point. This means it’s bucked in. Taking care with the dimension
measurements will result in doing the buck-in in one pass.