Shay Cab - Floor & Roof
Nelson Riedel Nelson@NelsonsLocomotive.com
Initial: 1/20/04 Last
|Cab Floor: A cab floor was made at the same time as
the tender floor. I was unhappy with some of the cutouts and
the way the floor fit around the boiler so I
made this second cab floor. The material is 1/8" thick hot
rolled sheet. The floor is fastened to the frame I beams
with four 6-32 flat socket head screws. The cutout
is for the fuel tank output hose and drain
|This is a view of the floor from the other direction. The
floor is designed so that it can be removed without removing the
shelf support by sliding the floor an inch or so to the
|Walkways: This shows the left walkway. The walkway is
fastened to the I beam and the supports with #1-72 button head cap
|This is the right side walkway with the whistle mounted to the
walkway. This side is also secured with #1-72 button
head cap screws into the supports and the frame I beam.
|Finishing strip: The floor and walkways all have a
1/8" square CRS finishing strip soldered (550 degree soft solder)
to the under side of
the outer edge. The
oxide coating was sanded off the plates before the strip was clamped
in place. The corner between the plate and strip was coated
several times with Ruby Flux and heated. Some solder was then
melted into the corner and spread with the flux brush after it was
dipped again in flux. This type solder doesn't flow as
readily as the 50-50 lower temperature solder. However, a
really nice joint can be made using this
technique. It helps to practice a little on a
couple scrap pieces.
Roof: Kenneth used a roof with a hole cut in the
center to access the controls. I liked the look of a
design shown in So You Want to Build A Live Steam Locomotive
that has the rear of the roof propped up to access the
controls. I wanted a design that:
Had a flat position for photos.
Had an elevated position for viewing the gauges and accessing
Permitted the roof to be easily removed
for access to the plumbing in the cab.
The photo shows the underside of the partially completed
roof. The frame sides and ribs were made of
1/8" X 1/2" CFS strips and the ends were cut from ~0.100"
sheet. The frame was silver soldered together. The props
are 1/8" X 1/4" CFS with 4-40 screws into the frame side
serving as pivots. The roof sheet is 18 gauge steel and
is soldered to the sides and ends of the frame using 550
degree soft solder.
|This shows the roof before the vent and gutters were installed.
Several schemes to raise the rear of the roof were considered
- An RF or IR controlled firmware based servo system
(recall, I'm an electrical engineer).
- A steam cylinder on each side to raise the rear
|After much thought a very simple roof control system was selected.
CFS 1/8" X 1/2" stiffener strips were riveted to the cab
sides just in front of the door openings. U shaped retainers
were made from 3/16" X 1/2" CFS stock by milling a
1/4" wide 1/8" deep slot. The retainers were screwed
to the stiffener strips using #0 button head cap screws. The roof
props slide through the retainers when the roof is in the lowered
position as shown in the photo.
When the rear of the roof is raised the L shaped clip slides
under the end of the prop to hold the roof in the elevated position.
There is no hinge at the front of the roof. The front of
the roof frame is held in position by the cab front and sides.
The props are held vertical by the retainers and keep the roof from sliding frontward or
backwards. The roof can be removed by merely
lifting it vertically.
|Gutters of 3/16" brass angle were screwed to roof using #0
button head cap screws.
|Roof Vent: The vent frame was made from 1/8" X
3/8" CFS. Slots for the ends were milled in the
sides. The sides were screwed to the ends using #0 flat head
brass screws through the slots. The corners were then silver
soldered. The photo shows the frame after the silver
soldering. The excess ends of sides were then sawed off and
the stub filed flush with the
|This shows one end of the frame. The notches are
for the top hinges. Note the offset that was milled in the
sides before the soldering process. The resulting lip of the sides
sets on top the roof while the ends fit inside the hole cut in the
|This shows the under side of the roof with the vent frame in
position. This design where the ends side through the roof avoids the
need to machine curved edges in the underside of the
|Vent Prop: The vent prop is made from two pieces of
1/8" square rod with pivots at the ends and
middle. The photo shows the vent in the raised
position. The position is stable because the upper rod is
pushing the lower rod against the frame.
|This shows the underside of the lowered vent. The prop
simply folds to achieve this position. The hinges
are from the local hardware store and cut down
|Finished Roof: This shows the finished roof in the lowered
|The roof with the rear elevated
|The operator's view of the cab gauges and controls.
The only things remaining to be done on the cab is to install the
window frames in the front and sides and then paint it.