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All woodworking tools need to be kept razor sharp. It really does make a difference. Not only is woodworking easier when cutting tools are sharp, the outcomes are better with less tear-out, less fuzzy edges and sharper cleaner cuts. All of which often means less sanding (at least for some things).
I have always found chisels to be the one tool in the shop that you can instantly tell if they are sharp or not, just by how they work. If you are a carver, you will really know the meaning of sharp tools because to carvers, trying to work with tools that are dull is exceedingly frustrating. I know carvers, and woodturners as always sharpening their chisels. They very quickly get to know the condition of the sharpness of their tools and are constantly "tuning them up" which really means adding the fine razor edge sharpness to what many of us would consider a sharp tool.
There are a few different methods, jigs and tools for sharpening, either by hand or with some sort of a machine. One of the sharpening machines is called a Tormek Grinder and is produced by a Swedish Company.
The Tormek Grinder development started around 1973, but long before that, around the world, large grinding machines were quite common. Often the wheels were 24" in diameter and were driven by a foot pedal or a crank, and some of them even had water cooling troughs attached to them. What Tormek did was bring this old concept and adapt it to more modern electric motors and make an amazingly accurate and efficient sharpening tool.