How to flatten the back of a chisel or plane iron.
To work properly a chisel must have a perfectly flat back. This also applies to plane blades to some degree. Very few new chisels are ready to use straight from the box, the back need flattening (known as lapping) and machining marks from manufacture need to be removed. Second hand chisels and plane irons usually need working on.
In this video we look at techniques for flattening and the problems that can be associated with it.
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