Quarter Sawing (Junior Cert Wood Technology): Revision Notes
📚 Revision Notes
Quarter Sawing
Quarter sawing, also known as radial sawing, is a timber conversion method. It involves cutting logs into boards by first dividing them into quarters and then sawing across the growth rings. This technique creates a unique grain pattern.
Definitions
- Quarter Sawing: A method where logs are quartered and cut across the growth rings, giving the wood a distinct grain pattern.
Process of Quarter Sawing
- Initial Log Quartering: Cut the log into four parts to allow sawing across the growth rings.
- Radial Sawing: Cut each quarter through the growth rings, creating planks with a bisected grain pattern, offering symmetry.
- Resulting Board Characteristics: The boards have a strong, appealing grain pattern with minimised shrinkage and warping.
Advantages of Quarter Sawing
- Increased Strength: Produces strong, durable boards suitable for flooring.
- Attractive Grain Patterns: Perfect for decorative furniture due to their beautiful grain patterns.
- Reduced Warping: The stable board structure makes them less likely to twist or shrink due to moisture.
infoNote
Quarter sawing is essential for creating durable and attractive timber products due to its unique method.
Disadvantages of Quarter Sawing
- Higher Cost: This labour-intensive process increases the overall cost.
- Waste Production: Generates more sawdust and offcuts than plain sawing, leading to more waste.
- Longer Processing Time: Handling and rotating logs takes more time.
chatImportant
Common pitfalls include the higher cost and waste production associated with quarter sawing, which could affect budgeting and resource management.
Diagrams
The diagram below shows the cut patterns and the orientation of growth rings in quarter sawing:
Summary
infoNote
- Quarter sawing involves cutting logs into boards by quartering them and sawing perpendicularly to the growth rings.
- This process results in stronger boards, appealing grain patterns, and less warping.
- Downsides include higher costs, more waste, and longer processing times due to the required labour and handling.