HAMAR LASER STEALTH Series, General Training Manual

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52
The L-742 Alignment Procedure
Horizontal Roll Parallelism
When aligning rolls for paper
mills, printing presses or film
lines, the most difficult
alignment is the horizontal
parallelism (vertical parallelism
or levelness can easily be
checked using a machinist
level). The following section
provides suggestions for
choosing a reference and step-
by-step procedures for equip-
ment setup and performing an
alignment.
Choosing a Reference for Roll Alignment
Conventional methods of
roll alignment usually use
floor benchmarks (monu-
ments) at the side of the
machine as references. The
L-742/L-732 offer 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.
L-742 Roll Alignment System Showing Laser Transfer Method