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The side view of the MÁV Class 327 engine. This drawing served to design the model. It was drawn by scanning the old design drawing, scaling it to H0 size in both dimensions and regenerating all its lines. Later all details were compared to photos and checked against common sense. This picture shows all details needed for modeling and even a few parts more. |
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The assembly drawing of the model. The large building blocks are shown with different colours. The cab and frame are black, the cylinder block brown, the boiler and its parts red, the motor and drive green. |
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The assembly drawing top view. The drawing was also used to find out the minimal wheel radius the model can negotiate. The curved blue lines correspond to a 22" (559mm) radius rail. In the right bottom corner the pony wheels almost touch the piston rod cover tube, thus this is approximately the minimal radius the model can negotiate. |
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The main frame drawing. All holes and openings are indicated, also those for the rivets. This drawing was used to generate the drill position file for the CNC machine. The large cutouts determine the mounting position for the main construction blocks, like cylinder block, gearbox and cab. |
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The gearbox drawing. The worm
does not drive directly the
idling gear. Actually the axle of the idling
gear contains two gears. The wormgear
has slanted cogs and the idling
gear with the same diameter has
straight ones. As you can easily
calculate tha overall reduction ratio
from the motor down to the wheel is 1:30.
The drawing also shows the equalization bar between the first and second drivers. |
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The main and connection rods and the valvegear are indicated red in this drawing. The main and connection rods are from 1mm (0.04") nickel silver while the valvegear parts from 0.4mm (0.16") nickel silver. |
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The front view of the cylinder block.
Left side shows the cylinder block itself,
the right side shows the yoke. The whole
structure is fixed on a T-shape nickel silver plate.
This block also contains the valvegear
and crosshead guides. It can be removed
as a single unit, just the crosshead pin
and the eccentric rod pin in the reverse link
should be pulled out.
A similar solution can be found in the earlier Class 342 and Class 325 models as well. |
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Design of the brake rods. The drawbars and equalization parts can only be made by etching. The structure can not move, it will be soldered. This structure will be hooked into the brake imitations soldered to the main frame of the model. |
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Cab, top view. This drawing shows the cab bottom plate with all its cutouts. The center cutout is for the gearbox, the slots at its both sides are for the rear drivers. The drivers of this loco have large diameter, their top is higher than the cab bottom plate. |
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The side view of the cab. Some of the boiler backhead details are also visible. |
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The design of the boiler backhead. It is equipped with an old type firebox door. Most of the backhead equipment visible on the prototype will be built for the model, too. |
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The tender side view. Here all rivets are indicated. The sidewall rivers are made by etching, the truck rivets by drilling. |
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Front view of the tender box structure. This box is a single self containing unit that can be fixed on the tender baseplate with four screws. |
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The tender back view. The buffers and buffer beam do not cover the internal details. This helps to find out if the truck and wheels correctly clear the frame components. |
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The tender truckside setup drawing. The model shows all rivets, these are brass wires soldered into holes. The leaf spring assembly will also contain single leafs that |
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This page was last modified on February 18th 2009
© János Erô