ZIMSEC · Form 5 · Lower 6
Wood Technology and Design
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- Wood science: structure, moisture and properties MC (%) = (wet mass − oven-dry mass) ÷ oven-dry mass × 100.
- Conversion, seasoning, preservation and forestry Through-and-through (plain) sawing – economical, more figure but more distortion; quarter sawing – stable boards, attractive ray figure, more waste; tangential sawing.
- Manufactured boards and adhesives Advantages: large sizes, stability, use of waste wood, uniform properties. Disadvantages: edges need lipping or banding, some are weak in moisture, formaldehyde emissions.
- Woodworking machinery and cutting theory Circular saw bench, band saw, surface planer, thicknesser, spindle moulder, router, mortiser, lathe, CNC router and panel saw.