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 TM 55-1905-221-14-3
6-16.
PROPELLER, PROPELLER SHAFT, AND STUFFING BOX (Continued).
LOCATION/ITEM
ACTION
REMARKS
ALIGNMENT (Cont)
(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.
6-193
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