Few things are more frustrating than a blunt knife. It takes skill and practice to sharpen knifes correctly
There are a number of different ways to sharpen knifes. An understanding of the basics is important regardless which method is used.
An understanding of the sharpening angle is important. When a knife has been sharpened before, it is generally best to continue with the same angle.
Most people would start on a rough grit and then move to the finer grit.
Some people use pull through knife sharpeners but more experienced users will use either a sharpening steel, waterstone or other types of sharpening stones.
The following video demonstrates the use of electrically operated sharpening wheels.
Warning: Although this guy new what he was doing, he ended up cutting himself.
Image Source – From the same video