Sharpening Incanel (inside the curve) Curved Edges
Posted: Sun Nov 01, 2020 1:40 pm
I recently purchased an adze that has the bevel on the inside of the curve, (incanel). I also have some carving gouges that are incanel type. These present special sharpening challenges. I have yet to find any manufacturer's type sharpening tool that fits all diameters and curve radii that will also put a razor edge on them. Grinding points for drill or dremel are available in quite a few diameters which are good for reshaping the bevels if for example you want more slope on them but I haven't come across any that are extremely fine grained. Luckily the solution is simple and cheap. Automotive wet/dry sandpaper does an excellent job and comes in some pretty fine grits.
To sharpen my adze I purchased one sheet each of 320, 800, and 2000 grit Klingspor sandpaper. Wet/dry sandpaper has silicon carbide grit on it so it cuts tool steel easily. I cut off three pieces of the paper about 2 to 2 1/2" long by 1 1/4 to 1 1/2" wide and wrapped them around a magic marker starting with the 320 grit one. A few minutes each of stroking them back and forth at the correct angle on the bevel had the edge sharp enough to cleanly cut some test wood. On incanel gouges you can usually find something that is close to right radius between wooden dowels, pens, markers, pencils, or anything else that is tubular in shape. It's also a good method for removing the burr on outcanel gouges. One photo shows some test cuts with the adze and it is cutting very cleanly sharpened to 2000 grit. If you want even smoother you can get felt bobs for drill or dremel and charge them with green honing compound. The green compound is 8000 grit and will polish the bevels.
To sharpen my adze I purchased one sheet each of 320, 800, and 2000 grit Klingspor sandpaper. Wet/dry sandpaper has silicon carbide grit on it so it cuts tool steel easily. I cut off three pieces of the paper about 2 to 2 1/2" long by 1 1/4 to 1 1/2" wide and wrapped them around a magic marker starting with the 320 grit one. A few minutes each of stroking them back and forth at the correct angle on the bevel had the edge sharp enough to cleanly cut some test wood. On incanel gouges you can usually find something that is close to right radius between wooden dowels, pens, markers, pencils, or anything else that is tubular in shape. It's also a good method for removing the burr on outcanel gouges. One photo shows some test cuts with the adze and it is cutting very cleanly sharpened to 2000 grit. If you want even smoother you can get felt bobs for drill or dremel and charge them with green honing compound. The green compound is 8000 grit and will polish the bevels.