Danny252
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Posts posted by Danny252
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I've taken on a number of older N Gauge Coronations as a maintenance project, and while I've got all running to some extent, am looking for some advice on making them run smoother.
All exhibit some amount of rocking motion while running, with the worst example looking like it's ready to throw itself off the rails when running at speed! At low speed, all locomotives struggle to run smoothly due to the rocking, almost as if something were catching or rubbing.
Is this more likely to be the valve gear (e.g. having been bent out of shape), an issue with the internal gearing (if they were diesel models of the same era, I might suspect split gears), or something else? Any tips on remedial action?
Catering for 7mm scale axles in a 3D print
in Modelling Questions, Help and Tips
Posted
I am working on modifying a CAD design for a 3D printed wagon, so far produced at 2mm and 4mm, for 7mm scale. My background is firmly 2mm, with 4mm "by exposure" - for 7mm, all I have is a collection of part-assembled kits donated to my local club, of varying age and completeness.
Those requesting the wagon in 7mm gave the suggestion of "make it work with Slater's" -there isn't much standardisation in 7mm axle fittings, it seems - and so I've been working with those.
Setting up the wagon such that the Slater's top hat bearings sat flush with the inside faces of the W irons (41.7mm apart), I found this leaves a surprising amount of sideways play in the axles - perhaps as much as 2mm. Although the wagon runs well on a test track, the ~2mm of sideways play feels excessive. Comparing to some other 7mm wagons, found that:
On attempting to match that, the axles are a tighter fit, but the issue becomes that it's very challenging to insert the axles. The W irons need to be bent out by nearly 3mm to fit - the distance from the outside face of one wheel to the opposite end of the axle being ~43mm, fitting into a ~40mm gap. This is not an amount of bending that a 3D printed resin takes kindly to, and it didn't take me long to cause damage by repeated insertion and removal.
So, my query for 7mm modellers - what do you expect from a kit?