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(Figure 2.12-C) extends from the outer face of the mount.
A lug
(Figure 2.12-B) extends from the inner face and matches a boss in the
face of the front frame mounting pads at the 3, 6, and 9 o'clock positions.
c.
Shim plates are provided to adjust the position of the scroll
end mounts.
The shim is manufactured from 321 stainless steel in two
thicknesses:
0.025" and 0.050".
2.36
Center Mounts
a.
Each scroll has two center mounts; one at the top (Figure 2.13-A)
which connects the scroll to the front frame and one at the bottom
(Figure 2.14-A) which connects the scroll to the rear frame.
b.
The body of the top center scroll to front frame mount
(Figure 2.13-B) is machined from Inconel X bar stock.
The base has four
holes and a lug which match a mounting pad on the front frame (at 4:30
and 7:30 o'clock): the arm contains a uniball which fastens to the clevis
at the top center of the scroll.
c.
Shim plates are provided to adjust the top scroll center mount.
The shims are manufactured from 321 stainless steel in two thicknesses:
0.025" and 0.050".
d.
The bottom center (scroll to rear frame) mount (Figure 2.14-B)
is made of Hastelloy X material.
The base plate is 0.032" thick, the top
plate and gussets of 0.040" material are pinned to the lug.
The doubler
washers welded to the tabs are 0.063".
The lug is machined from bar stock.
e.
A thermo gasket, consisting of an insulating gasket and a shim is
assembled between the center mount and the front frame to minimize the heat
flow to the front frame.
2.37
SCROLL END COVERS
a. The scroll end covers (Figure 2.15) provide a seal at the ends of
the scroll arms yet permit "growth" of the arms because of thermal
expansion.
Each pitch control fan has three scroll end covers; one each
11-2.17
R-1
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