| 摘要 |
<p>A cylindrical hollow blank 1 is separated longitudinally from inside an elongate block of wood by axial boring, the blank is dried and its outer and inner surfaces finished, eg by milling, turning and sanding, and a bottom piece (2, FIG. 2) and, if required, a lid (3, FIG. 2) are then added to form a container. A plurality of cylindrical blanks of different diameters may be produced from a single block. Two concentric core bits of different diameters may be used to bore a blank.</p> |
