< 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.