Reply To: Expensive Chisels
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Flat backs is an interesting topic. I was always taught that the leading edge and two outer edges should be on a plane. The rest can have a slight hollow. I haven’t yet purchased a chisel that was otherwise, although I know they exist.
I can’t tell, most of the time, if people expect a uniform plane across back. I’ve never used such a beast but doubt that it matters. The difference between the edge and the hollow is so very small, and wood is such a highly variable material in comparison, that I can’t see the benefit of a uniformly flat back.
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It’s not that they want a flat plane over a hollow grind, but that most of the cheaper chisels are not properly ground to begin with. They come with a slightly convex back that will push the chisel off the path and create inaccuracy in the work. Most Japanese chisels and some quality, expensive chisels are hollow ground. Hollow ground is preferred due to the very low coefficient of friction, but if you lack the funds to purchase hollow ground chisels or the tools to create the hollow grind yourself, then flattening the back lets you create a more precise tool. Most individuals can flatten a chisel with a piece of MDF and some sandpaper.