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Sawing, Planing and Shaping Characteristics of Five Mangrove Species.

M. Obaidullah Hannan*
Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh.

A.K. Fazlul Hoque
Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh.

Md. Anisul Islam
Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh.

Abstract/ Executive Summary:

Sawing, planing and shaping characteristics of five mangrove species, viz., baen (Avicennia officinalis), gewa (Excoecaria agallocha), kankra (Bruguiera spp.), passur (Xylocarpus mekongensis) and sundri (Heritiera fomes) were studied. Three types of band saw blades, viz., spring set, swage set and stellite tipped, were used for sawing operation. Of these saws, stellite tipped blades showed excellent ripping performance in sawing sundri, passur and kankra whereas swaged set saws performed better in ripping gewa, baen and passur. In planing test the performance of kankra was average and others were average to poor in quality. In shaping test kankra showed good shaping quality, baen and gewa were fair, and sundri and passur were poor.

Keywords: Sawing; Planing; Shaping; Mangrove wood; Wood Technology.

Location: In Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Vegetation

Objectives:

This evaluation of sawing, planing and shaping characteristics of sundri, gewa, passur, baen and kankra was undertaken as a part of exploring the timber potential of mangrove forest resources.

Methodology:

Logs of sundri, gewa, passur, baen and kankra were procured from the Sundarbans. Three types of saw blades, viz., spring set, swaged set and stellite tipped, were used in conducting sawing test. Saw blades were 10 cm in width. A total of 15 logs of each species, five logs for each of the three types of saw blades, were converted to 2.54 cm (1 inch) thick planks by plain sawing at Bangladesh Forest Research Institute’s saw mill. During sawing feed rate was maintained constant at 100 cm per minute. Smoothness of cut was considered the critical factor in judging the machinabilty of the species. Frequency and severity of cutting defects were graded on numerical scale as per ASTM standard: Grade 4 was considered excellent (defect free), Grade 3 – good, Grade 2 – fair and Grade 1 – poor.

Converted green planks were kiln dried to 12% moisture content and 10 samples of each species were dressed to 2 cm x 10 cm x 122 cm in sizes. These samples were further converted to 2 cm x 10 cm x 90 cm and 2 cm x 7.5 cm x 30 cm planks for planing and shaping tests respectively. Planing, the peripheral milling to smooth surface(s) of wooden work piece or to bring it to a prescribed thickness (Koch, 1964), was tested by a Whitney 105 single surface planer with four knive that operates at 3000 revolution per minute (rpm). The cutting angle was 25°. Shaping, the peripheral milling to cut an edge profile or edge pattern on a workpiece, was tested with a belt drive, single spindle shaper with a 6.4 cm diameter cutter operated at 6380 rpm. To ensure sharpness of the machine during all tests, knives were changed frequently.

These tests were carried out according to ASTM standard: D-1666-64 (Anon, 1969). Defects in the planing and shaping test were evaluated following Davis (1962).

Source of Information: Khulna University Studies, June 1999, 1(1): 19 -21

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Stellite tipped blades were found to be the most suitable for sawing mangrove timbers. Except kankra, other mangrove species were found to be below average standard in planing test. Among the species tested kankra showed best shaping quality. However, the scope of this study does not include any recommendation for particular species for end-use. Results of this study are of indicative values. Further investigation is recommended to help in the selection of a species for a specific use.

Knowledge Management: Journal