Live steam model on 7¼" gauge of the Württembergische T3 no 924

Welcome to this blog. It will inform you about the progress of designing and building miniature live steam, coal fired locomotives for passenger hauling. Currently I'm working on a 7¼" gauge, scale 1:8, German T3 steam locomotive.

In 2006 I started this new project. This is a small 0-6-0 branch line locomotive of the German KWStE (Königlich Württembergischen Staatseisenbahnen) origin with outside cylinders and Walschaerts valve gear. The loco is about 1.10 metre long and will weigh approx. 100 kg.

On the left you'll find the index where you can browse through the different articles and on the right you'll find all the extra's. On the top tabs you'll find a brief description of my other locos.

Enjoy this site. Erik-Jan Stroetinga. The Netherlands. Europe.

Sunday, 30 December 2018

Güterwagen Omk (part 4) brakeman's cabin doors (Bremserhaustüren)

To continue with the brakeman's cabin I've started in making the doors. 
The first versions of these wagons the cabin was closed on one side and open on the other without a  door. The later versions had wooden doors with windows on both sides. 

Pine wood strips of 4 mm thickness and 18 mm wide are ready available from the DIY-store, and suitable for the job. The ends are reduced to half their thickness in the milling machine. This is done on both parts; so the created overlap is used to glue them together. 

 From paint stirring sticks the lower panel of the door is made. The recess is also cut in the milling machine.

The inside of the door

The outside (without the window frame)

An old hinge of a wooden toolbox was adapted to make the hinges for the doors.

 After sawing out of the old hinge, they were cut to size on the angle shear. 
 Bending them to fit the door....

.... and drill the holes for fixing.

With glue and nails they are secured to the door.

With small M1.2 screws they are fixed to the cabin.

From a modelshop some very fine grain wood (sapele mahogany) was bought for making the edge of the door. These were cut to size with a small saw and directly glued on the door. A pencil and a ruler, a pair of small clamps is all that is needed for this job. The surplus of glue, pressed out of the seam, is removed straight away with a small scraper. 

The window frames were made of coffee stir sticks.

 Steel strips, previously forged in shape when red hot, ready for silver soldering. This will make the balustrade.  

A protective coat of primer to protect the wood. 

 I still have to think about how to make the door locking mechanism for these doors. Even in 7¼" gauge (1:8) this is a small and fiddly thing. 

Cap for brake handle

Tuesday, 18 December 2018

Güterwagen Omk (part 3) door closing mechanism and brakeman's cabin (Bremserhaus)

Finishing the door closing mechanism and making the brakeman's cabin were the next thing on the list.
A lot of  details are shown on the original work drawings of these wagons. Most of it can be directly scaled down from these drawings, but some parts have to be made a bit sturdier, if they want to survive on a 7¼" gauge working model steam railway. 

The doors are operated with a lever, that lifts the lower and upper part of the closing mechanism. It is fabricated from 3mm mild steel and filed to the required shape. The small pin to the right is the support for the door handle, that will be silver soldered to it.

Bending was done with a large adjustable wrench.

The bended angle was checked on the drawing. The handle is turned from 5 mm steel.

The hinge for the lever is fitted on the outside of the door. 

Catches for the locking mechanism are riveted in position; the hole location is taken from the catch. A movable crossbar is be used to close the top of the door. 

With the aid of a small home made bending tool the door grips are bended.  They are made of 2,5 mm welding rod. The ends are flattened and drilled, so the grip can be riveted to the left hand door.  

The doors almost completed.

When the door handle is lifted, the lower part is moved upwards (a catch on the bar below the doors has still to be fixed) and at the same time the top crossbar is lifted.

The brakeman's cabin (Bremserhaus) is made of wood. 

A plywood back plate is used for glueing the side and cross planks on. This way there is some more strength in the construction and it is easier to get the assembly to the correct dimensions.  

The back side is made in the same way. Of course I could have used the same material as was used for the side boards of the wagon (9 mm plywood), but than the grain of the wood would all be in the same direction. As to be seen in the picture, the planks were mounted in different directions on the real wagon and I tried to copy this in the model. Each plank was glued in separately. 

The door opening was sawn out with a jigsaw.

The assembly of the cabin. With the small clamps a square is held in place during the curing of the glue. I found it more difficult to keep things square and straight in wood than in metal.

A test fitting on the end platform.

Again a primer coat was applied by brush. This to prevent stains on the wood during the further production process.  

U-shaped profiles are needed on the back of the cabin. Alas the correct dimension was not available, but by milling a standard 10 x 10 x 2 mm aluminium profile to size, it was possible to make them. 
The profile is clamped to a thick steel bar, so they could be machined over a relatively long length in one set-up.

These were also glued, and as an extra,2 mm rivets were used to fix them. These rivets were glued with super-glue in pre-drilled holes. 

A general view of the wagon behind the locomotive. Although not on the correct height, it gives an impression of how the driving truck will look. 

Because the driver will sit on the wagon to operate the engine, there is the possibility that the brakeman's cabin will get some knocks during usage.  
Therefore on the top side steel girders are inserted, to give the construction some extra strength and hopefully some resistant to impact. 

These girder plates give also extra surface for glueing the roof to the cabin.

The roof is made of 0.7mm zinc-plated steel. The front side of the cabin consists only 4 mm pine wood planks (ready available from the DIY-store)