< Bogie Truck 2 >
Four wheels for the bogie truck were painted
with stove enamel which was used for the
William. Before painting, whole job was scrubbed
by wire brush and degreased by acetone. Then,
roughly masking bosses and rims with card
boards, I sprayed twice for each side.
After that, the rim and the boss were sanded
in the lathe, so as to define boundary of
the paint.
O.D. of the axle blank is 20 mm, which is
bigger than the lathe headstock's I.D. Therefore
I employed 'fixed steady' to turn the axles.
The wheels were glued onto the axles with
Loctite.
The photo shows laser-cut equalizers put
back to back. Note subtle swells at the middle.
The bends were done as follows.
I prepared a bending jig from round and rectangle
rods. The jig is put between large vise jaws.
As I squeeze the vise, first the rectangle
and inner two round rods catch the job and
bend to V-shape, then the outer two round
rods push the outer area to opposite side.
When the both ends become straight again,
the process is completed.
The equalizer and leaf springs are assembled
with eye bolts, pins and nuts, same as the
main chassis' springs.
The photo shows side control assy. The sliding
pedestal is made from gunmetal casting, which
is secured in rectangle cavity of the bogie
center casting and can move right and left.
Four coil springs push the pedestal from
both sides.
The coil springs are made of hard stainless
wire, coiled in the lathe. Note the start
diameter is smaller than the rest, for the
following reason.
So as to keep the springs from coming off,
left and right coils are combined with screw,
nut and rings. The sliding pedestal is drilled
to a desired depth from both sides, then
small hole for the screw is opened through
the block.
All of components for the bogie truck were
assembled.
The bogie truck is engaged with the stretcher
casting of the main chassis. The center pin
is only for keeping the bogie truck from
drop. I inserted a spacer between the sliding
pedestal and the stretcher, for adjusting
the bogie truck's height. The thickness of
the spacer will be optimized when I finish
the loco.
