csb springing on a 240 chassis

[philpill]

not used csb before but have seen several articles on it ,however most of these articles dealt with 060 chassis but i want to build a small metro tank how would csb used here would there be one for the two main driving wheels and a 2nd wire solderat one end to spring the leading 2mm axle and boxes also what is the best type of wire and diameter for this job

[grovenor-2685]

i would expect to treat it exactly the same as an 0-6-0, on the KISS principle.
Use guitar string as usual, diameter unknown till you know the weight, usually just trial and error till you get approx 0.5mm deflection.
Regards

[philpill]

Hi Keith can you explain KISS principle

[grovenor-2685]

See https://en.wikipedia.org/wiki/KISS_principle
In this case one single spring wire each side, no added complications.
Regards

[dal-t]

There's a 7mm 0-4-2 in CLAG's CSB Gallery here (scroll down to just after the Pannier). Must admit it's the first time I've heard of a 'modified Bradwell' - sound a bit like an illegal cricket delivery!

[Paul Willis]

Hi Phil,

The starting point for understanding CSBs is Will Litchfield's invaluable "CSB Source Book". It's a thread that you will find at http://www.scalefour.org/forum/viewtopic.php?f=96&t=3605

There is also a huge amount of information on the CLAG website at http://www.clag.org.uk/beam-annex3.html.

For a Metro tank, I would treat it as an 0-6-0 chassis, but use an extender to keep the wire in line. You'll find a particular discussion of 2-4-0 options at http://www.clag.org.uk/beam-annex3.html#0-4-2-options and what I am suggesting is the fourth listed option. I have a GER 2-4-0 to build, and it will use this technique.

Cheers
Flymo

[MarkS]

There was also this discussion from a few years back here - including useful tangents on pickups, torque reaction & gearboxes.
viewtopic.php?f=19&t=1277