< Chassis Painting >
All of components on the chassis were completed,
so now is the time to paint chassis. I chose
black variety of aerosol stove paint for
my loco. I tested some of major suppliers'
so as to get nice half-gloss finish. It needs
stoving of 1.5 hour at 150 centigrade.
For stoving, I obtained a far-infrared heater
(485mm, 100V-500W), and fixed it in a structure
made of aluminum angle.
The main frames were painted without disassemble
(except buffer beams). Removing the rust
and dirt with emery cloth, wiping with alcohol,
I painted twice in each side. The stoving
was done as the photo shows. The heater can
move forward and aft in order to heat all
of the long frames.
I employed infrared-thermometer to control
stoving temperature. Care must be taken to
ensure that the heater's infrared light doesn't
come into the detector. Also it cannot measure
reflective metal surface temperature well.
As the cylinder blocks were assembled with
Loctite 510, I must stove them at less than
100 centigrade so as not to spoil the sealing.
The photo shows cylinder blocks after painting.
Note the masking paper on all of holes in
the blocks.
The piston rods had been fixed in the crossheads
only with lock nuts. I added taper pins for
security. The both parts were drilled and
taper-reamed together, then fixed with stainless
steel taper pins.
After painting and stoving all of parts,
they are assembled again. Non painted parts
(rods and valve gear parts) were washed with
paraffin and polished with oil again. For
assembly, I employed Loctite 222 to all of
screws.
The return cranks were also fixed to the
crank pins with taper pins. The method is
same as the crossheads.
In a stretcher, a pair of countersunk holes
were cut, so as to ease lubrication to the
funnels on the eccentric straps.
Finished chassis. Note the buffer beams have
not mounted yet, because I plan to add some
details to them.
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