< Status of the Castings >
As a reference, the foundry engineer sent
me castings with runners. The right hand
photo shows face down view. You can see a
round column 'downsprue' in which molten
metal is poured.
They have many burrs because the engineer left a slight gap between parting line so as to release air from the cavity.
The photo shows iron castings of expansion link bracket, the most complicated one. I introduced patterns and coreboxes for them in August 2006 report.
The sand mold for the expansion link brackets. You can see different color 'cores' to form slits in the castings.
To complete chassis of the loco, some gunmetal castings are necessary, too. I asked another foundry to prepare them. They include axleboxes, brake cylinder, side control cylinder, etc.
The engineer asked me to prepare pattern plates (410x360mm) to secure casting patterns, because my patterns are so small and thin that it is difficult to remove them from sand mold.
The left hand photo shows lower plate with dowels and detachable liner. The right hand photo shows upper plate with dowel holes and downsprue. Typical single pattern will be glued onto the lower plate. The plates are made from MDF (Medium-Density Fiberboard).
I prepared handmade cutter to cut dowel hole of truncated cone shape. Only the cone side face has the edge. So it is necessary to open straight hole before using the cutter.
The dowels were turned from round wood bar and parted off. Insert them into the dowel holes of the upper plate, spread adhesive onto the parted face, lay the lower plate onto them and secure whole job with clamps.
I visited Oigawa railway in this month. Oigawa is a full size railway company in Shizuoka, Japan. The railway keeps four kinds of Japanese steam locomotives, C10 C11 C12 and C56. They work every day with old style passenger cars.
Famous Japanese tank locomotive C11 was coming into Senzu station.
Passenger cars lined up along both sides of a platform. Such old style cars cannot be seen in any other railway in Japan.
Cab inside of C10. Note the pressure gauges are replaced with Pascal unit type.
'Coal feeding training' This is Japanese one-handed style with (imaginary) small shovel.
Steam shed by Shinkanaya station.