PRÜFTECHNIK ROTALIGN ALI 3.500, Operating Instructions And Alignment Handbook

Page: 130 / 164

6-9
ROTALIGN 01.2000
Shims
Proper shims must be used for satisfactory alignment results based
upon ROTALIGN shimming corrections.
What constitutes a "proper" shim? First, its thickness must match the
correction values (within 0.025 mm, [1 mil] since shimming stock is
not made thinner than this). The thickness must be consistent over
the whole shim area, without any thick or thin spots. The shim must
be flat, without seams or folds from bending. Burred edges must be
removed or the shim will act as a spring, compressing a bit each time
the foot bolt is tightened, especially when several burred shims are
stacked upon one another. The shim material must be dimensionally
stable, without appreciable cold flow effects when subjected to high
compression over long periods of time. It must also withstand the
demands of the service environment without corroding, since rusty
shims can also act as springs.
Commercial precut shims fill these requirements best, while saving a
major portion of alignment time compared with shims hand cut from
rolls of sheet stock. PRÜFTECHNIK offers two different types of
shims in a wide range of metric thicknesses and sizes to fit most
machine feet. Check with your ROTALIGN dealer for inch thicknesses
and other custom shims.
Complete set of shims PERMABLOC ® LAMIBLOC ®
Shaft alignment in theory and in practice
PERMABLOC
®
individual stainless steel shims are obtainable in
single thicknesses or as complete sets in their own carrying case. Each
shim is permanently etched (not printed or stamped) with its
thickness. By simply pulling the single shims from the case, the
proper thickness can be achieved in just a few seconds.
LAMIBLOC
®
shims are laminated from 12 layers to give a total
thickness of 1 mm; the correct shimming amount is obtained simply
by peeling off the excess layers. Only a handful of shims are,
therefore, needed at the job site. They may also be ordered as a
complete set in their own case and are available in brass or stainless
steel.