Do You Flatten the Backs of Your Chisels?
One of the fundamental definitions of a sharp edge is the intersection of two flat surfaces that meet at some angle. Whether it’s a chisel or plane iron, if one of the surfaces isn’t flat, you can’t expect to get a sharp edge.
There’s a running discussion over on WoodNet about if, when, and how you flatten the backs of your chisels. Then there’s the question of what “flat” really means.
Personally, when I buy a new chisel, I’ll use wet/dry sandpaper on a granite tile and work through the grits until the back is polished. Then I’ll work on the bevel to get a sharp edge. After that, the only time I work on the back is to remove any burr after I’ve honed the edge. I’ve had good success with that method and my chisels seem to be plenty sharp. The same holds true with my plane irons.
With western chisels, I only worry about polishing the last ½” or so of the back. Japanese chisels are hollowed out on the back side, making them easier to flatten.
Head over to WoodNet and leave your 2¢ worth.
Jason Luis said,
I’m a long time subscriber to Shopnotes and Workbench (and soon Shopsmith).
I just wanted to say thanks for giving users access to the archives. Your competitors charge all sorts of fees to read their articles and here you are giving it away for free! It’s good to see that the spirit of sharing ideas, (i.e. what makes us all enjoy wood working so much) is alive and well.
Keep up the good work and ensuring that the passing of teachings continue in an age where apprenticeships are long gone in this buy it don’t make it world.
Jason
(posted on August 20th, 2007 at 2:33 am)