Improper store

Clean flooring

Improper maintenance

Dim lighting

Wear loose clothing

Secure the work piece rigidly before cutting

Hold sharpening tools in hand loosely

Avoid safety goggles

Endogenous tree

Conifers tree

Exogenous tree

Narrow leaves tree

Soft wood

Hard wood

True wood

Duramen wood

Pith

Bark

Annular ring

Medullary rays