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With our Samhongsa steamers the springs have all been removed when we rebuild the chassis. Most of te Samhongsa steamers (with the bearing springs) were bad running engines and needed a new chassis inserted between the old one. In most cases the springs are also useless while they were either too stiff or too soft. Springs too stiff are useless and springs too soft have an impact on the running quality while the drivers could move too much upwards due to the force in the coupling rods. Using no springs has resulted in very good running engines Marc
I have never encountered a brass steam loco where the bearing springs (is this a new term?) were too soft. Wouldn't that be equivalent to not having the springs at all (since they would be constantly fully-compressed)? But I also do not have as much experience with brass models. Usually those springs are too stiff which also results of them not functioning as desired, resulting in the drivers being solidly suspended in the frame (not being able to travel upwards when needed).From both examples, the soft springs would be a better alternative, allowing the drivers to drop down into dips in the tracks, keeping electrical contact.Best springs would be ones which would allow the drivers to sit half-way between the top and bottom limits of the bearing travel. But that would be difficult to achieve. They would have to be custom-made for each specific model (their stiffness would depend on the number of drivers, loco mass and by how much weight the leading/trailing trucks support But as I mentioned, I think that soft springs would be a good compromise.
This is very interesting info-- what are you using in place of the springs-?Thanks,Wolf