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 TM 55-1905-222-14
6-24
ALIGN PROPELLER AND PROPELLER SHAFT (Continued).
just clear of the end of the outer
bearings of the set to be aligned. A
length of piano wire is stretched
between the supports. The supports
must be rigid and not subject to
deflection when the wire is put under
tension. The wire should be attached
to the supports. In such a way that it
can be accurately centered in the end
bearings. After the wire has been
centered in the end bearings, the wire
forms the line of reference (when
corrected for sag) for all the intervening
bearings.
(2) Alignment of shafting by the optical
method makes use of the line of sight,
which for all practical purposes is a
true line. This method consists of
boring a large hole in the end of two
boards. One board is fitted at each end
bearing of the set to be aligned. A
small hole (about 1/16 to 1/8 inch) is
drilled in two pieces of thin sheet metal.
The sheet metal is placed on the
boards and the small holes are
adjusted so that they are aligned with
the center of the end bearings. A light
is placed behind the board on one end
and observed through the hole in the
board at
the other end.
The
intermediate boards are adjusted so
that the light can be seen through all
the holes. The center of these holes
serves to establish the reference line.
(3) When it is suspected that the shaft is
out of alignment, it should be checked
by slacking the coupling bolts at a
coupling.
6-132
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