Machining (planing and turning) characteristics of four Ghanaian lesser used wood species

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The project sought to determine the planning and turning characteristics of four lesser-used species which are found to be among the most abundant timber species by volume in Ghanaian Forests (Forest Inventory Report, 1989). The test species were Stronthosia glaucescens. (Afena), Ceitis rniidbraedii (Esa), Petersianthus macrocarpus (Essia) and Ceiba pentandra (Onyina). Factorial experiment was used to investigate the effect of the moisture content of the wood, the knife cutting an1e and the feed speed on the surface quality of the planning and also the effect of moisture content and turning speed on the surface quality of turning. The results indicated that the effect of moisture content, cutting angle and feed on surface quality speed were all significant at 1% and 5% probability levels. At the same probability levels species-moisture content interaction showed no significance. In the turning test, moisture content and turning speed were significant at 1% and 5% probability levels.. Afena (Strombosia glaucescens) was outstanding in surface quality both in planning and turning. Onyina (Ceiba pentandra) planed well but showed poor surface quality in turning. Essia (Petersianthus macrocarpus,) also planed and turned well but Esa (Ceitis n2iidbraedii) planed well when the cutting angle was as low as 15o the turning of Esa was not very satisfactory. Afena and Asia are recommended for use for any work where high surface smoothness is needed. Even though Ceiba planes well, it should be ignored for any turning work. Celtis should be planned at a moisture content below 20% and a cutting angle below 15° for good surface quality.
A thesis submitted to the Board of Postgraduate Studies, Kwame Nkrumah University of Science and Technology, Kumasi, in partial fulfilment of the requirement for the award of the Degree of Master of Science in Wood Technology and Industrial Management, 1997