Trevor Grout wrote:..I think you may be able to get away without them, the outer fulcrums that is ..
dcockling wrote:The CLAG website shows Ted Scannell's arrangement for the bogie of a 2P 4-4-0...
Jol Wilkinson wrote:I agree that Trevor's idea could provide the answer. It provides what is effectively the same idea as the sprung bogie in several London Road Models kits, which customer feedback indicates does work (even in OO).
There is already a Bill Bedford solution?
grovenor-2685 wrote:There is already a Bill Bedford solution?
Quite, which is the main subject of this topic, try reading this post
Armchair Modeller wrote:Sorry - perhaps I didn't explain myself very well - in the current diagram on Bill Bedford's web site the CSB arrangement seems a little different to that drawn in the original post on this thread - particularly the bogie, where the ends of the springy beam seem to be loose on the BB diagram.
Will L wrote:but based on things you can really only discover once you've climb out of the armchair.
Will L wrote:Armchair Modeller wrote:Sorry - perhaps I didn't explain myself very well - in the current diagram on Bill Bedford's web site the CSB arrangement seems a little different to that drawn in the original post on this thread - particularly the bogie, where the ends of the springy beam seem to be loose on the BB diagram.
I noticed that too Richard, but if you look at the image of the etch, also given in Bill's instructions, it has the fulcrum "eyes" etched into the ends of the bogie side frames, and you'd need to fold them up to get the end cross members on. The bogie as etched also has tabs, onto which these end cross members are soldered,which are etched higher than the isomeric drawings suggest. I assumed this is because it would have been impossible to slide the suspension wire into the outer fulcrums points if these tabs were placed as in the isometric diagram. So the diagrams and etch don't agree. My conclusion was that Bill wasn't actually suggestion a single central fulcrum point but had just left the outer fulcrum points off his diagram, but based on things you can really only discover once you've climb out of the armchair.
craig_whilding wrote:Will have you tried emailing Bill to see what he states is the correct way of building this and possibly also a mail to Ted as well about his 2P?
Trevor Grout wrote:I have been asked to post this on Behalf of Bill Bedford.
"The thing about CSBs is that they are so mind bogglingly simple that people can easily miss how simple they are, and tie themselves in knots thinking up 'solution' to non-existing problems.
Will L wrote:.. is I'm not trying to have a go at Bill, nor am I terribly concerned about any perceived problems with the kit, some of which may prove to be as much to do with the way I put it together as the kit design. Also if you read back to the top you will be reminded that I didn't start this thread until I was happy I now have a good working version of the chassis. So obviously there is more to come on this.
.Trevor Grout on Behalf of Bill Bedford wrote:The basic principle is that the weight taken on a set of axles can be varied by replacing the wire with one of a different size. So WillL's problems with his C12 can be cured simple by using thinner wire on the bogie and pony truck. I suggest that he starts with 14 thou on the drivers and 10 thou everywhere else.
Will L wrote:... The whole thing typifies the basic problem of implementing a sprung chassis with a number of separate springs. It may well be possible to get it to work, but only with a considerable amount of work getting the various springs adjusted correctly. This is of course a problem we share with the prototype, but without benefit of a weigh bridge to tell you just how much weight you have got on each wheel.
Trevor Grout on Behalf of Bill Bedford wrote:Getting a 4-4-2 to balance is a bit of a juggling act but not that difficult.
Trevor Grout on Behalf of Bill Bedford wrote:If You want to object that softer springs on the bogie and pony truck will cause proposing, well that seems to be entirely prototypical see http://www.lner.info/forums/viewtopic.p ... nky#p29688"
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