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... ; I prefer not to take chances. And yes, the top part of the rail is filed pretty thin, but not to a knife edge. Cheers Nigel posted: 2 Jan 2011 16:59 from: Judi R Martin Wynne wrote: Only the extreme top corner needs to be a knife edge. The rest of the switch blade can be quite robust at the tip. This is a simple model approximation to undercut planing for use with a plain set: 2_010801_470000000.png As an alternative, you could try this profile: 1932_021155_110000000.gif... which maintains full web thickness for both stock and switch rails and minimises the gauge narrowing problems. Judi posted: 2 Jan 2011 17:10 from: Martin Wynne Hi Judi, Thanks for that. The problem with the chamfered style of planing which you show there is that it is very difficult to do in model form. Almost all model rail section has a significantly over-scale web thickness, which limits the scope for tucking the switch rail under the head of the stock rail. And it is ...
2. Joggles
... usually made in flat-bottom rail because the rail section is too stiff. Most flat-bottom switches use the chamfered style of planing in which the stock rail is machined: 1679_261348_250000001.jpg The above pic from the excellent collection of Michael Davies in the Image Gallery, the large hi-res version is at: gallery/1679/original/1679_261348_250000001.jpg Lots more pics at: http://85a.co.uk/forum/gallery_view.php?user=1679#gallery_top Chamfered planing looks like this (this diagram is for bullhead rail): 1932_021155_110000000.gif The problem with chamfered planing is that it is very difficult to do in model form. Almost all model rail section has a significantly over-scale web thickness, which limits the scope for tucking the switch rail under the head of the stock rail. And it is very difficult to make the undercut planed angle on the stock rail head using only hand tools. The angle on the switch rail top, and its height, also need to be precisely matched to the stock rail. I have never seen a model version ...
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