Kozo K27 Cylinders
This is the start of the second part
of the cylinder assembly construction. The holes have been drilled and
tapped for the cylinder and steam chest covers as seen on the left. The
right shot shows the two sight holes at the top, the snifting valve and
lube holes in the middle and the steam inlet hole from the prior
section at the bottom. Next will be the drilling of the exhaust
passages which will require an interesting setup on the milling table.
January 3, 2020.
Today was spent drilling the exhaust
passages that run from the outside grove of the steam chest to the
center of the backplate. This involved mounting the assembly rotated 36
degrees on a 90 degree angle plate to orient the piece for drilling.
One of the more complicated steps in the machining of the cylinders.
January 4, 2020.
Here is the view of the exhaust
passage from the backplate side of the assembly. There is a second
exhaust passage heading out to the other end of the steam chest. These
passages will run through a T-pipe between the frame rails and then up
through the bottom of the smoke box to exit at the stack. Next up will
be another set of passages that will require a slightly easier setup
for machining. January 4, 2020.
The project today was cutting various
angles on the end plates. This will assist with drilling the steam
passages between the steam chest and the cylinder and also brings the
end plates closer to the final shape. The steam inlet, snifting valve
hole and lube holes are visible at the top. The drain hole for the
cylinder drain cock can be seen at the bottom. January 5, 2020.
The operation today was to drill the steam passages between the
cylinder and the steam chest. This was performed with the cylinder
assembly rotated 37 degrees on while mounted on a 90 degree angle
plate. One assembly has been completed and the second still needs to be
drilled. January 12, 2020.
The steam passages have been drilled
at the ends of both cylinders. A rotary tool was used to round all of
the edges inside the cylinders to prevent the O-rings from being cut as
they are installed. January 20, 2020.
One of the end plates has been rounded
and angles cut to the final profile. Only three more end plates to trim
up. January 20, 2020.
Both assemblies now have the end
plates finished to the final shape. Next I'll be working on the caps
for the steam chests. February 8, 2020.
The front heads for the steam chests have been completed and the front outer covers are also done. February 15, 2020.
The outer covers for the back of the
steam chests are completed. Work has started on the steam chest back
heads which are fairly complicated due to having the support for some
of the valve gear. February 16, 2020.
The lathe work for one of the steam
chest backheads has been completed and milling has been started.
Another flat will need to be cut on the bottom side and then some angle
cuts to taper from the large end to the flats. Then there will be some
hole drilling for the mounting holes and covers. February 17, 2020.
One of the front steam chest covers
has had most of the major milling with both flats and angle cuts. A
small triangle will be cut in the angled portion and then the bolt
holes will need to be drilled. March 15, 2020.
The pair of steam chest rear covers
have been machined and drilled. The front one is shown without the
decorative outer cover and the rear one has it set in place. There is
one more machining step that will cut a small triangle in the sides
near the cylinder assembly. March 21, 2020.
The steam chest rear covers have been completed with the machining of the triangle openings in the sides. March 22, 2020.