Machinability of Hardboard

Briefly describes sawing, drilling, dye cutting, routing or shaping, and machine bending tests for hardboard. Hardboards should be machinable without plugging the cutting equipment, or causing surface defects or edge defects in the hardboards. For sawing, a table saw equipped with an 8-inch or 10-inch blade, operated at 9000 fpm is recommended. It should be a cut-off type with three or four points per inch, set to about 0.007-inch clearance on each side. Adjust the saw 1-1/2 inches above the table and feed the board at approximately 50 feet per minute. For test of drilling, use 1/4-inch twist drill ground with clearance at a 120? point angle. Operate the drill at 2,000 rpm and drill against a wood block. As a test make 5 holes 1/4 inch from the edge of the test specimen. For die cutting, it is suggested that a hole punch be made for a 1/2-inch hole. For a test of routing or shaping, the use of the home workshop type of shaper or router, operating a spindle at about 8,000 rpm is proposed. The procedures outlined are proposed on the basis of equipment simplicity and availability. They are suggested for preliminary hardboard machinability testing evaluation.

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