Ten-Tec 4229 - Variable Capacitor Assembly; End Plate and Insulator Assembly; Rotor Section Assembly

VARIABLE CAPACITOR ASSEMBLY #80962
I. Assemble end plates and ceramic stator insulators. REFER TO FIGURE l.
( ) 1. Using 6-32 x 1/2" machine screws, hex nuts and lockwashers, attach the
stator insulators to the front and rear aluminum end plates. The in-
sulators mount on the inside surfaces of the end plates (two screws
each). The slotted mounting feet point to the outside of the capacitor
assembly.
( ) 2. The long straight side of the insulators should be flush with the top
edges of the end plates. CAUTION: The raised surfaces of the insulators
must be in contact with the end plates.
( ) 3. Do not tighten the screws more than necessary to hold insulators to front
and rear plates. Excessive torque on these screws will fracture the in-
sulators.
STRAIGHT
INSULATOR
6-3e xe"
SCREWS
#6 WASHER 3
RAISED SURFACE
BUSHING
FRONT END PLATE
SLOTED MOUNTING FOOT
FIGURIE |
II. Assembly of rotor section. REFER TO FIGURE 2.
( ) 1. Stack alternately the 25 semicircular rotor plates and 25 rotor spacers
on the rotor shaft assembly. Begin stack with a plate against the bush-
ing that is installed on the shaft. The last item in this stack will be
the 25th spacer.
( ) 2. Using one 1/4-32 hex nut, tighten the assembly while keeping the plates
aligned. (It might help to align the plates if you can use a couple of
blocks -- books of equal thickness -- to support the flat edges on either
side of the center.) Now tighten the stack so that the plates are held
firmly
in
place.
The
shaft
may
be
held
with
pliers
on
the
fixed
bushing,
but
DO
NOT
hold
the
smooth
front
end
of
the
shaft
with
pliers
as
this
may
damage the shaft.