HAMAR LASER STEALTH Series, General Training Manual

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Roll Alignment Buck-in and Laser Transfer Procedure
When aligning rolls, be they paper mill, printing presses or film lines, the most difficult alignment is the
horizontal parallelism. The vertical parallelism or levelness can easily be checked using a machinist level.
Hamar Laser provides two systems for roll alignment: The L-742W Ultra-Precision Roll Alignment
System for printing presses and paper machines, and the L-732W Precision Roll Alignment System for
lower-accuracy roll alignment applications, such as rubber mills and textiles.
Conventional methods of roll
alignment usually use floor
benchmarks (monuments) at the
side of the machine as references.
The L-742W (or L-732W) offers
the versatility of using these
benchmarks or of picking up a
reference roll, such as a cooch
roll on paper mills. We strongly
believe that using a reference roll
provides the most accurate
reference and results in better
alignments.
Benchmarks are usually set in a
thin concrete floor, are rarely
covered, and are routinely run
over and nicked. More importantly, they move with the slab of concrete and rarely hold their position
relative to the mill itself. Most floors in a typical plant have multiple slabs and are usually cracked
throughout, creating instability of the monuments. Unless checked each time they are used, using the
benchmarks probably will result in significant alignment errors.
Figure 24 – Dimensional View of Roll Alignment