Cutting curves with a router, like round arches and free curling forms, is a real job and needs a fair amount of preparation. It is particularly difficult when you cannot derive a complex shape you want using a compass, and must rely on a series of only more-or-less suitable curves. Different radii are combined skillfully, the shape is drawn and roughed out with a jigsaw, and then further shaped with all kinds of other tools, perhaps best with a table spindle sander, to produce the desired template. The preparatory work is enormous and so often hardly worth while for single pieces.
So the Kurvenlinfix from FISCH, in Austria, represents a real innovation. It is made of a very elastic plastic, unbreakable, tough, flexible and produces a nice fair curve. With this curve template, you can quickly produce precise and clean individual pieces. It is designed for round, segmental or elliptical arch shapes, any kind of curve, and cutouts in different shapes. It mounts simply with screws on the stock you want to use for a pattern, and then you cut the curve with the routerís copy ring riding against the plastic. So there is no difference if you use a shaper, a table router or just cut freehand.
If screw holes on one side of the workpiece present no problem, and you are working on a one-off piece, then the Kurvenlinflex can be mounted directly on the workpiece. Otherwise you must take the intermediate step of creating a pattern, which in any case allows the shape to be cut repeatedly with excellent precision. The smaller the cross-section of the Kurvenlinflex, the smaller the radius of the curve you can use it for. For larger pieces and shapes with flat sections, the bigger sizes are needed to provide enough support for accurate cutting.
The smaller the cross-section of the Kurvenflex, the smaller the radius of the curve you can use it for. For larger pieces and shapes with flat sections, the bigger sizes are needed to provide enough support for accurate cutting.