Statistical Quality Control and Veneering Research on Semul

The objectives of this research were to provide knowledge of the technical factors necessary to satisfactorily peel semul, a species of the genera of Bombacaceae, and simultaneously to demonstrate the usefulness of statistical quality control in producing veneer for research purposes on a commercial scale rotary lathe. The over-all study was split into two phases: 1) to determine the proper knife angle, and 2) to determine proper nosebar settings for a Coe lathe and acceptable temperature levels in the wood. This work demonstrated that uniform light-weight but strong veneer can be made from these woods. These species of cotton (or kapok) trees range throughout the tropical world. Many are fast- growing with large clear stems of light-colored wood that could be valuable as core material, or even panelling if figure is not desired. The value of using Shewart’s X and R charts in selecting proper peeling conditions is illustrated by showing that direct comparison of mean thicknesses and data variation alone could be misleading without the information observed on the Shewart charts.

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