I have started a new bridge which is bridge number 3 ? I will have 3 bridges, all different on my railroad; two I will have made myself and one in Aluminum was made for me as a kit from Frank Neher in Germany, and is very good: this one is the same size as Frank's.
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The first is a pony truss and has a slight mistake (which I won?t be correcting, as you have to be very knowledgable, and it does not affect the bridge ), and is made from wood strip; thus it is removeable and stays out of theweather. The present bridge is being made out of PVC solid foam and some scrap plastic called Altuglass which is very hard and quite rigid. The bridge is a 4 foot long Howe Truss bridge, which is 4 foot long, just over a foot high and will be 9 inches wide ? nothing like variety!
The first attempt foundered on my lack of bridge knowledge ? and it is not mentioned in Kalmbachs book on bridges etc either; they have to have an odd number of side panels (shaped like a ?X?) otherwise they will not work! Mark 2 is much better, one side has been made, and still needs the tension rods adding (those need some nuts fixing to them ? they have not yet been ordered! But I can now make the other side to a viable pattern: then the cross pieces top & bottom are due to be made, needless to say they are both different.
Here are a couple of photos of the side panel; most things are in threes; so plenty of work has been done on the big circular saw ? still more to do, but I am getting there!
More to follow ---
f
The first is a pony truss and has a slight mistake (which I won?t be correcting, as you have to be very knowledgable, and it does not affect the bridge ), and is made from wood strip; thus it is removeable and stays out of theweather. The present bridge is being made out of PVC solid foam and some scrap plastic called Altuglass which is very hard and quite rigid. The bridge is a 4 foot long Howe Truss bridge, which is 4 foot long, just over a foot high and will be 9 inches wide ? nothing like variety!
The first attempt foundered on my lack of bridge knowledge ? and it is not mentioned in Kalmbachs book on bridges etc either; they have to have an odd number of side panels (shaped like a ?X?) otherwise they will not work! Mark 2 is much better, one side has been made, and still needs the tension rods adding (those need some nuts fixing to them ? they have not yet been ordered! But I can now make the other side to a viable pattern: then the cross pieces top & bottom are due to be made, needless to say they are both different.
Here are a couple of photos of the side panel; most things are in threes; so plenty of work has been done on the big circular saw ? still more to do, but I am getting there!
More to follow ---
