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1. 
   ErnieConover | Dec 13, 2005 10:33pm | #1

   Router planes are handy for cutting dados, inlays, hinge mortises to depth and even cleaning up the cheeks of a tenon. Known for centuries they were first made in wood and often referred to a “Witches Tooth” due to the hag tooth nature of the cutter. This hag tooth is, however, a bit tricky to sharpen. I like a set of three ceramic stones (coarse medium and fine) for this job as they are very durable—virtually immune to wear. Gripping the shank of the cutter in a vice I dress the top of the cutting edge (the bevel) with each of my three stones in turn. I hold the stone in both hands and use them much like I would use a file. Removing the cutter from the vice I then set the bottom flat on the stones and bring it to a polish. The bottom of the cutter is on an upward slope of about 10° to provide clearance during cutting. Only putting the bottom edge down flat insures that this critical angle is maintained.