- The most obvious is that a sharp tool will cut the wood cleaner. The wood fibers are more likely to be cleanly sliced by a keen edge than a dull one.
- A sharp edge can pick up a fine cut. A section through a sharp edge looks like two surfaces coming together at a fine point which is capable of removing fine shavings. When the tool becomes dull, that fine point becomes rounded off, and can only pick up a cut that is thicker than the rounded edge.
- A smaller force is needed to push a sharp tool through wood. There is an equal and opposite reaction, the rotating wood trying all the time to throw the tool backwards. A dull tool will see a larger backwards force, and will be harder to control.
Sunday, June 14, 2009
It seems fairly obvious that sharp tools are necessary to be successful at woodturning, and very often a dull tool, or at least one that is not as sharp as it should be, is the reason for bad experiences. But have you ever considered why? I would like to suggest three reasons, though there may be others that I haven't identified yet.