Dog Star
Western Thunderer
I am building a road over rail bridge from 5mm foamboard (as sold by Hobbycraft) - this product is some form of extruded foam interior with a thick paper layer on each side of the foam. As the bridge is skew to the line of the railway the bridge features "helicoidal" arches and therein lies the root of this question. The front face and rear face of the bridge are parallel, the vertical faces of the arches are parallel - the curved, underneath, surface of each arch is (roughly) a parallelogram with the long sides as drawn-out 'S' curves.
To get the underneath layer of each arch I have made a template for use in cutting foam parts. As the shape of the piece is dependent upon the "skew" angle and the radii of the arch I have gaps of up to 2mm between the underneath piece and the front / back of the bridge.
What can I use as a filler of the gaps where the arch piece joins the front / back faces of the bridge?
thank you, Graham
To get the underneath layer of each arch I have made a template for use in cutting foam parts. As the shape of the piece is dependent upon the "skew" angle and the radii of the arch I have gaps of up to 2mm between the underneath piece and the front / back of the bridge.
What can I use as a filler of the gaps where the arch piece joins the front / back faces of the bridge?
thank you, Graham