Watch the video first to see how effectively it works. Go here:
After a class, most times, I notice that two or three (some times more) of my cabinet scrapers have been filed and honed incorrectly and end up out of square, often with the bevels are far from 45-degrees, often to a bull-nosed camber. In developing the highly refined cutting edge to a scraper there is no doubt that starting out as near to flat on the 45-degree bevel is important. It’s not so much the angle of the bevel as the straightness and flatness that’s important. Here is my answer to inaccurate filing.
Most people including woodworkers fail to get the edge they need for a couple of basic misunderstandings. On the one hand they misunderstand the use of the term burr, which, as I explain at length in my book Essential Woodworking Hand Tools, is not at all a burr but a highly refined and developed turned edge. The second issue is that because the edge is bevelled in similar fashion a bevel down bench plane iron they think that the blade is indeed loaded bevel down because they don’t realise that the bevel is drawn out with a steel burnisher and then subsequently turned along the edge so that the cutting edge engage the grain along the ‘hooked’ cutting edge. If you can at least start refining the bevel with a dead-on bevel filed and honed to 45-degrees you are well on your way to developing the final edge. Making and using the guide takes but a few minutes and takes out any guesswork; once you have made it you have it for life.
See how the turn button helps keep the two opposing inclines aligned under clamping pressure.
The filing and honing will result in a burr but this is not the cutting edge we are creating. To remove the burr place the steel blade flat face down on the honing plate and slide it along back and forth to weaken the attachment to the cutting edge.
Don’t raise it too much as this results in the edge not cutting. The blade is now ready to install back in the body of the holder.