### Wood Moisture Content
Wood moisture content (MC) is a critical factor that influences the properties and behavior of wood, particularly during turning. Moisture content refers to the amount of water present within the wood fibers, typically expressed as a percentage of the wood’s oven-dry weight.
### How Dry Should Wood Be Before Turning?
The optimal moisture content for turning wood depends on several factors, including the species of wood and the intended use of the turned object.
– **General Rule:** For most turning projects, wood with an MC between 7% and 10% is recommended. This range provides a balance between stability and workability.
– **Hardwoods:** Hardwoods typically require a lower MC than softwoods, as they contain more dense fibers which hold moisture more tightly. For hardwoods, an MC of 6-8% may be appropriate.
– **Softwoods:** Softwoods can tolerate a higher MC, as their fibers are less dense and can release moisture more easily. For softwoods, an MC of 8-12% may be acceptable.
– **Thin or Small Objects:** Thinner or smaller turned objects require a lower MC, as they are more prone to cracking and warping due to moisture loss during turning. For these objects, an MC of 5-7% may be advisable.
– **Finishing Considerations:** If the turned object will be painted or finished with a film-forming finish, a lower MC (6-8%) is recommended to minimize the risk of cracking or blistering due to moisture trapped within the wood.