Guiding a flush trim router bit along a good template allows you to accurately cut a single piece or many identical parts. Ready-made templates are available for certain applications, but you can also make your own. If you have ever had difficulty making your own router template, then a tool like the Kurvenlinfix flexible router guide might be the answer you are looking for.
To use the Kurvenlinfix, roughly cut out your template out of plywood, MDF, or whatever you are using as your template material, but leave the cut line visible. Then, screw the Kurvenlinfix guide on top of your template-to-be, and align it along your template guideline.
Finally, you just follow the resulting guide with your router to complete the template. The bearing of a trim router bit tracks against the Kurvenlinfix edge and leaves your template with a precise and clean edge.
Fisch Tools, an Austrian company, doesn’t elaborate on what material they use to manufacture the Kurvenlinfix; they just say they it is a “highly elastic” plastic. But, since the guide is meant to be reused to help make multiple router templates, it should be durable too.
Reinforced mounting holes are equally spaced and span the entire length of each Kurvenlinfix guide. This, and the guide’s flexible nature allows you to make slight positional tweaks incrementally so that the guide follows your template guideline as closely as possible.
Fisch Tools sells two models of the Kurvenlinfix in several different lengths. Around 1/2″ wide, the red “mini” is the thinner model. It is used to fit tighter curves and comes in lengths of 600mm (nearly 24″), 1200mm (nearly 48″), 1800mm (nearly 72″) and 2400mm (nearly 96″). My German is a bit rusty, but I believe the last two are special order.
The blue models are thicker, measuring about 3/4″ wide, and are made to fit more sweeping curves. They sell the blue models in 1, 2, and 3 meter lengths (~3, 6, 9 ft).
The Kurvenlinfix isn’t cheap. The shortest red “mini” will run you about $45 before shipping while the shortest blue model runs $85.
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Besides making templates, I wonder if a product like this might be useful for scribing cabinets, counter tops, trim work, etc as long as you had access to the under/back side where screw holes would not show. You’d just scribe your line, attach the Kurvenlinfix along the line, and take off the excess with a router.
Here’s a video demo that shows how the Kurvenlinfix are used: