Generally speaking of thumb, the burr is rolled at an angle between 80 and 85 degrees on a flat-edged scraper. Bevel-edged scrapers, such as those used in cabinet scrapers and scraper planes, are thrown at 35 to forty five degrees. Over the years, I’ve seen a great deal of woodworkers struggle with sharpening a scraper. In the event you follow the simple method shown here, the same that I’ve used to train numerous classes, I am just confident you’ll be creating whisper-thin shavings in no time. roller burnishing tool
Filing the Scraper Flat
The first step in sharpening a scraper is to file the edges properly flat. Merely clamp the scraper in your bench vise (with wood liners, of course) and take a few strokes across the top edge with an easy mill file.
Honing the Edge
After the corners of the scraper are flat, the next thing to do is hone them smooth. NOTE: My spouse and i have successfully skipped this task on occasion; but if you wish an uniform burr, particularly if you are thinking about super-fine bits, it’s definitely worth the hard work to hone the benefit. Since holding a scraper on edge vertically therefore it is correctly perpendicular is almost impossible, I use a trick I learned from master chairmaker Brian Boggs.
Brian sandwiches the scraper between two wood obstructions to support the scraper in perfect position and then rubs this “sandwich” on the stone. Note that it’s important to alter the sandwich to prevent the thin edge of the scraper from credit scoring a groove in your stone.
Burnishing at 80 Certifications
Once you’ve perfected the edges of the scraper smooth, it’s time to get the actual burnisher. I get started burnishing with the burnisher held verticle with respect to the face of the scraper. I take several strokes with medium downward pressure along the complete edge of the scraper. This will compress the metal and actually create a tiny burr, which you should be able to feel by making your thumb up from under the edge. In some cases, this can be the complete burr you need. For anyone who is planning on removing a whole lot of material, you’ll want a larger burr and you’ll need to burnish the edge at an angle.
Burnishing into the angle
Hold the burnisher at 80 to 95 degrees for a flat-edged scraper and around forty five degrees for an angle-edged scraper. Apply light pressure and have a few strokes. Check the burr and repeat if it’s not large enough. You might be surprised how little pressure is typically had to create a burr. We have seen guys pressing down very hard they were bending the scraper. This should not be necessary. Whether it is, really likely that your burnisher isn’t hard enough to roll the burr.