HAMAR LASER STEALTH Series, General Training Manual

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(rotate the fixture/roll to put the target as close to the laser as you can and then sweep it through the arc to
the other side).
First, zero the target in the near position. Then rotate the roll so the target/fixture are as far away from the
laser as possible (far position). Any deviation from zero is a measure of how far out of square the roll is.
For example, if you take a tape measure and measure how far the target moves when you sweep it and then
divide the alignment value at the far location, you have an angular measurement expressed in inches/inch.
Therefore, if the sweep distance is 20 in. and you get .030 in. at the far location, the angle is = .030/20 =
.0015 in/in. If the roll is 24 in. long, move it 24*.0015 in. = .036 in. to correct the error.
Checking Saw-Blade Squareness
When checking the squareness of a saw blade to the travel of
the log carriage, the laser must be moved along the centerline
(down the machine) from the initial setup location to within 12
to 18 in. (305 mm to 483 mm) of the blade. Here is how:
1. After roughly aligning the laser to the references, it is then
“bucked in” as before to put the laser plane on the machine
centerline.
2. Recall that the L-743/L-733 has three laser planes (two
vertical and one horizontal) and they are all square to each
other. This means that with the first vertical laser (yellow
plane in the graphic) plane aligned to the machine’s
centerline, the second vertical laser plane (green) is
perpendicular to it, so to measure squareness of a saw blade,
mount a target horizontally on the closest point on the blade
and zero it.
3. Rotate the blade 180 degrees and any deviation is how far out of square the blade is to the machine
centerline.
4. If the blade is mounted on a carriage where the travel is supposed to be perpendicular to the
centerline, you can simply zero the target in a close position and then move the blade carriage to the
other end of its travel and any deviation noted in the value is a measure of the squareness error of the
travel of the blade carriage.
5. Since the readings update in real time, the blade (or carriage) can be adjusted so that the reading is
zero, which means it is perpendicular to the travel of the carriage.
Figure 22 – L-743 Laser showing three mutually
perpendicular laser planes