Abstract
It seems that, nowadays, a theoretically accurate method of making a screw surface of a board is not known yet.Applying the character of a involute helicoid, the author has derived the theory on making a screw surface of a board, and made a very accurate one by using this theory. This method has following advantageous points in comparison with some other approximate methods.(1) The outside diameter, the pitch and the flank angle can be made as designed. In other words, the theoretically accurate screw surface can be made.(2) The flank angle can be made into any angle that satisfies its purpose within the limit decided by the outside diameter, minor diameter and the pitch, on the basis of the character of a involute helicoid.(3) The number of winding of a screw surface which is made of one board can be calculated.Furthermore, the author thinks that this is the only method of making the theoretically accurate screw surface of a board, since it is theoretically impossible to make it of a triangular thread and the like of a board.
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