Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . Fig. 55. Diagram of Right-Hand Triple Helix diameter of the wire, and either one of the dimensions A, B, or CIf A is given, we subtract from A the diameter of the wire to findB; and if C is given, we add to C the diameter of the wire to get B;then, knowing B and the pitch, we can draw the helix (which is shownin dotted lines) exactly as the helix was drawn in Fig. 52. This isthe helix formed by a line in the
Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . Fig. 55. Diagram of Right-Hand Triple Helix diameter of the wire, and either one of the dimensions A, B, or CIf A is given, we subtract from A the diameter of the wire to findB; and if C is given, we add to C the diameter of the wire to get B;then, knowing B and the pitch, we can draw the helix (which is shownin dotted lines) exactly as the helix was drawn in Fig. 52. This isthe helix formed by a line in the center of the wire. Now draw aseries of circles with centers on this helix and of a diameter equalto the diameter of the wire. Smooth curves drawn tangent to thesecircles, as shown in the figure, will give the projection of the 57 shows a helical spring of square wire. The drawing ofthis is simply the drawing of four helices, starting from each ofthe corners of the square ACML; this square being the cross sectionof the wire of which the spring is made. All four of the helices. Fig. 56. Accurate Diagram for Helical Spring of Round Wire have the same pitch, equal to AB for, since the square BDP N isthe same as ACML, the distance CD is the same as AB; and sincethe points L, M, N, and P are vertically under A, C, B, and D, 74 MACHINE DRAWING respectively, the distance LN is equal to AB, and MP is equal toCD. The helix AFB has a diameter equal to that of the circle IE,and is drawn by dividing the circle IE and the pitch AB, as in Fig.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublis, booksubjectmachinery
