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Aviation History
1918
1918 - 0208.PDF
FEBRUARY 21, 1918. 4P1.—Specifications forTurnbuckles. Fig. 1.—Eye fork type.The eye shall have left- hand threads and thefork right-hand threads; for double-eye type oneend shall have left-hand threads and the otherright-hand threads. ...^ L »• (101.6 at I for Innj turnkuetla J I J' ( SO 8 «) for tnoft turnnuelU ~* f/_. tola:- TlllitD -4- » -4— ' —J Jkrga ma poa.lfcla. t —+-J»-4— » such strands twisted concentrically around a central strand of the same construction forming a cable. (b) The general specifications, 1G1, shall form, according to their applicability, a part of these specifications. MATERIAL.—2. The wire shall be manufactured of either I.A.S.B. standard steel No. 1065, No. 1070, or No. 1080, the compositions of which are listed below. MANUFACTURE.—3. (a) The steel wires composing the individual strands of cable shall be laid concentrically around the centre wire in one layer of 6 wires and another, or outer layer of 12 wires with a left-hand (counter clockwise) pitch, the lay or pitch of both layers being of the same length ; the cable itself shall be constructed by twisting 6 of these strands composed of 19 wires each around a seventh strand of the same construction and material with a right-hand (clock- wise) pitch or lay of 6 to 8 times the diameter of the whole. It is not to be understood that the strand composing this cable must necessarily be composed of wires of the same diameter. (b) The steel from which the wires composing the cable are drawn shall be manufactured by the acid open-hearth process. (c) Wires composing the cable shall be uniformly coated with pure tin to solder readily. d) Joints in wires in cable having a diameter of 0.187 (3 16 in. (4.76 mm.) and larger shall be brazed in a gas fire. In cable having a diameter of 0.156 (5/32) in. (3.97 mm.) or less, wires maybe joined either by brazing or twisting at the manufacturer's convenience. Tucked in or welded joints are not permitted. No two joints in individual wires shall be closer to one another in the completed cable than 30 ft. (9.14 m.). WORKMANSHIP AND FINISH.—4. Each length of cable is to be evenly laid and free from kinks, loose wires, or other irregularities. The cable shall remain in this condition when unwound from the reel or bent around a standard thimble proper precautions being taken to secure the ends. PHYSICAL PROPERTIES AND TESTS.—Tensile Test.—5. (a) A tensile test shall be made upon each individual reel of cabls purchased of a size. (b) Samples of cable for testing for tensile strength shall be no less than 24 in. (610 mm.) in length. In making tensile tests the distance between jaws of testing machine with sample in place and before test shall be not less than 10 in. (254 mm.), (Continued on page 205.) CHEMICAL COMPOSITION OF STANDARD CARBON STEELS. Number. 1065 1070 1080 Carbon. 0.60-0.70.65- .75 0 .75- .90 Manganese. o. 50-0.70 •50- .70 .25- -50 Phosphorus,maximum. 0.040 .040 .040 Sulphurmaximum, o .045 . •O45 .045 TABLE OF WEIGHTS, SIZES AND STRENGTH OFCABLE. ENGLISH UNITS. Diameter,inches. Minimum Approximate 0.375 (3/8).344 («/3») .312 (5/16) .281 (9/32) •250 (1/4) .218 (7/32) .187 (3/16) .156 (5/32) .125 (1/8) breakingstrength, pounds. 14,400 X2i5OO 9,800 8,000 7,000 5,600 4,200 2,800 2,000 weight,pounds per 100 feet. 26.45 82-53 17.71 14-56 12.00 9-50 6.47 Diameter,millimetres. 8.7317.938 7-144 6.3505.556 4-7633.969 3-175 METRIC UNITS. Minimum Approximate breakingstrength, kilograms. 6,53* weight, 4.445 3,629 3,175 2,540 1.905 1,270 907 per 100 metres. 39-36 33-53 26.35 21.67 17.86 14.14 9-63 6.61 4.29 Ins. 1/321/16 5/64 3/32 7/64 1/8 3/64 5/32 3/16 7/32 i/4 5/16 11/32 3/8 REELS FOR CABLE. ENGLISH UNITS. P5° Ins. 12 12 12 12 16 16 16 16 18 18 18 18 18 18 Isis 3X~ S-s 6' nun> 0.794 1.588 1.984 2.381 2.778 3-1753-572 3-969 5-556 ' 6-35O 7.938 8.731 9-525 i,000 feet. Ins. 44 44 44 77 77 10 10 10 10 Ins. 8 10 10 12 12 12 12 10 IO Ins. *:• 2r 2* i METRIC UNITS. 305 metres. mm.28.58 28.5828.58 28.5828.58 28.5828.58 28.5853-98 53-9853-98 53 9853.98 53-98 METRIC UNITS. 1,524 metres. mm. 305 406 406 406 406 406 610 610 610 610 813 813 813 813 mm. 102 102 178 178 254 254 254 254 254 254 457 457 508 508 mm. 203 254 305 305 203 203 254 254 254 254 406 406 406 .406 mm. 28.58 28.58 28.58 28.58 28.58 28.58 28.58 28.58 53.08 53.98 53.9853-9f 79.38 8 914 metres. mm. 102 102 102 102 178 178 254 254 254 2542 54 *54 406 406 mm. 203 203 254 254 305 305 203 203 203 203 254 254 406 406 nun.28.58 28.5828.58 28.5828.58 28.6828.58 28.5853.98 53.9853.98 539853.98 8 10,000 feet. SiI1 Ins.4 7 10 10 10 10 16 16 16 20 22 22 16 16 Ins. 10 128 8 8 10 10 10 10 16 18 18 26 26 3,048 metres. Ins. 1 2 2 2 3;3; 31 In making racks for the above reels allow a 4the traverse specified above. 406 406 406 406 457 610 610 610 610 813 914 914 1,270 1,270 in. or 102 102 178 254 254 254 254 406 406 406 508 560 560 406 406 -mm. ere 254 305 203 203 203 254 254 254 254406 457457 660 660 jater wit 48.5828.58 28.5828.58 28.5828.58 53-953.98 53 9879-38 79.3879-38 79-3879.38 1th thai 2O4
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