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N15class

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I have actually got on and cut some metal. As usual I started with the chassis. After a bit of cleaning up, it was time to see how we are going to do things.

 

Firstly there are no holes for the brakes so these are marked and drilled. I also noticed that the bottom of the chassis is straight but the outside frames are shaped. I decided to loosly fold up the frames and see how it looked. I do not think it was a problem, but decided to shape the bottom of the inner chassis, just make sure it is almost invisible.

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I then cut out the to side beams for the compensation.

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The coupling rods are made up from 3 layers. These went together very nicely. Once cleaned up we are ready to fit the beams and bushes.

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Here is the inner chassis set up on my JPL jig. I find this works really well. As you can see, the middle and rear bushes are already soldered, and the front is ready to go. The pivot for the side beams will be done once the bushes are finished. I need to look at space for the motor and gear on the rear axle.

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Edited by N15class
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Are the rods jointed on the crankpin, or on the knuckle? Wasn't sure when looking at the last photo.

They are joined on the crankpin, they were designed that way. I do like them hinged on the knuckle, but I have a feeling there will be lots of other alterations to do with out adding any.

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Guest Simon Dunkley

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You seem to have 4-point suspension in mind. With twin side-beams, as you have, the more usual arrangement is to provide a fulcrum for the third axle: either via a beam resting on top of the bearings, or a simple bar above the middle of the axle. Drive would be to either of the other two axles, via a simple gearbox or fold-up mount.

 

Pictures below show what I mean, I hope:

 

100_1492.jpg?w=584&h=440

 

100_1494.jpg?w=584&h=440

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You seem to have 4-point suspension in mind. With twin side-beams, as you have, the more usual arrangement is to provide a fulcrum for the third axle: either via a beam resting on top of the bearings, or a simple bar above the middle of the axle. Drive would be to either of the other two axles, via a simple gearbox or fold-up mount.

 

Pictures below show what I mean, I hope:

 

100_1492.jpg?w=584&h=440

 

100_1494.jpg?w=584&h=440

Yep I like the way that will work. I will look into that on the next loco. This one will stay as it is, I know it is not ideal but it works within reason.

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