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Aviation History
1918
1918 - 0028.PDF
JANUARY 3, 1918. 3S13—Specifications for 19 Nonflexible Steel-Wire Cables. GENERAL.—1. (a) This specification covers the finish, material, and construction of high strength steel-wire cable composed of steel wires twisted concentrically about a steel wire as centre. (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 cable shall be laid around the centre wire in one or two layers as required by the number of wires in the cable with a left- hand (counter-clockwise) pitch and with a length of lay not to exceed 11 times the diameter of the cable or not lesf than 9 time? the diameter of the cable. (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 readity. (d) Joints in wires composing the cable shall be brazed in a gas fire. Tucked in, welded, or twisted joints will not be per- mitted. No two brazed joints in individual wires shall be closer to one another in the completed cable than 150 feet (45.72 m.). All brazed joints in wires shall be tinned. Exposed brass at joints shall not constitute cause for rejection. 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 reel of cable purchased of a size. (b) Samples of cable for testing tensile strength shall be not less than 24 ins. (610 mm.) in length. In making tensile tests the distance between jaws of testing machine, with sample in place and before set, shall be not less than 10 ine. (254 mm.). ,. (c) Samples for tensile test may be clamped in the jawB of the testing machine in the usual manner to facilitate testing, but in case of failure or dispute on individual tests, and at the request of the manufacturer, check tests shall be made by socketing the samples with pure zinc. (d) Cable for use in the construction of aircraft shall meet the required breaking strength specified in the table. Bend Test.—(e) One bend test is to be made on a sample cut from each reel of cable of a given size. Each sample must be bent once around its own diameter and straightened again at least 20 times in succession in the same direction of bending without any of the wires breaking. Torsion Test.—(/) A torsion test is to be made on one wire from each sample of cable taken for tensile test. The wire is to be gripped by two vices 8 ins. (203 mm.) apart. One vice shall be turned uniformly at as high a rate of speed as possible without perceptibly heating the wire ; one vice shall have free axial movement in either direction. (g) The number of complete turns which the wire shall stand is determined by the formula : 2.2Number of turns = •,.- , • • • ,- — diameter in inches 55-9 diameter in millimetres. (h) Failure of one piece of wire to show full number of turns specified in the above torsion test shall not be consideied cause for rejection, but in such case two additional tests shall be made on two more wires from the same sample of cable, and if both samples meet the requirements of the specification the cable shall be accepted in this respect. DIMENSIONS AND TOLERANCES.—6. There shall be no permissible variation in gauge below size. Cable having a diameter of 0.031 (J2) to 0.156 (&) inch (0.79 to 3.97 mm.), inclusive, shall have a permissible variation of 10 per cent, above size, and cable having a diameter of 0.187 (&) to °-375 (|) inch 4.76 to 9.53 mm.); inclusive, shall have a permissible variation of 7 per cent, above size. DELIVERY, PACKING, AND SHIPPING.—7. (a) All cable shall be shipped on reels in lengths and sizes as specified on orders. (b) The dimensions of reels for different lengths and sizes of cable shall conform to the table attached to this specification. (c) A tinned or galvanised steel seal wire of approved design shall pass around no less than three convolutions of the cable on the reel and shall pass through a linen tag showing the name of the manufacturer, the size and length of cable on the reel, the order number or other distinguishing marks, and a record of the test for tensile strength. A lead seal impressed with the official stamp of the representative of the Government making the inspection shall secure the ends of this seal wire and furnish evidence of inspection and acceptance. (if) The outer layers of cable on a reel ready for shipment shall be protected from mechanical injury in handling and transportation by an efficient covering of burlap. CHEMICAL COMPOSITION OF STANDARD CARBON* Number.1065 1070 1080 Carbon.0.60—0.70 0.65-0.75 0.75-0-90 STEELS. Manganese.0.50-0.70 0.50—0.70 0.25-0.50 LABLE OF WEIGHTS, SIZES, English Units. Diameter, 0 0 0 0 0 0 0 0 0 0 ao inches..312 (5/16) .250 (1/4) .218 (7(32) .187 (3/16) • 156 (5/32) .125 (i/8) .109 (7 64) •094 (3/32) .078 (5/64).062 (i/ib) •031 (1/32) CABLE. Approxi- mate weight,Breaking strength,pounds. 12,500 8,000 6,100 4,600 3,200 2,100 1,600 1,100 780 500 185 poundsper 100 ft. 20.65 13-50 10.00 7.70 5-5O 3-5o 2 .60 i-75 1.21 0.78 c.30 Phosphorus, maximum. 0 0 0 AND .040 .040 .040 Sulphur, maximum.0.045 0.045 0.045 STRENGTHS OI Metric Units. Diameter,millimetres 76 5 43 3 2 2 1 938 35o556 763 .969 .175 • 778 .381 .9841958S ao •794 Breakingstrength, kilograms 5,6703,629 2,767 2,087 i,45i 953726 498.9353-8 226.8 83.9 Approxi- mate weight,k ilograms per 100 metres. 30.72 20.09 14.88 11.46 8.18 5.21 3-872.60 1.80 1.16 0-45 «7 wire. = 3 Ins. 1/32 1 /16 5/64 3/32 7<<M 1/8 9/64 5:32 3,i6 7/3* 1/4 5/i6 11 32 3/8 Mm. 0.794 1.588 1.984 2.381 2.778 3-175 3-572 3.969 4-763 5-556 6 3507.938 8.7319.525 Ins. 1616 1616 1818 1818 1818 Mm.305 305305 305406 406406 406457 457457 457457 457 Ins.1 /3a 1/16 5/64 3/32 7/64 1/8 9/64 5/32 3/i6 7/32 i/45/i6 11/32 3/8 Ins 12 16 16 16 16 16 24 24 24 24 32 32 32 32 REELS FOR CABLE. ENGLISH UNITS. .28 •o •3 § ? g B C2 "is 2 £~ ft i.ooo feet.Ins. Ins. 4 8 4 84 8 4 8 4 lo 4 10 7 12 77 7 io IO 10 10 Ins. 12 12 12 10 10 3 Ins. 12 12 16 16 16 16 16 16 18 18 24 24 32 32 METRIC UNITS. 305 metres.Mm. 203 Mm 102 102 102 102 102 102 178 178 178 178 254 254 254 254 203 203 203 254 254 3053°5 3053O5 254254 203203 Mm. 28.58 28.58 28.58 28.58 28.58 28.58 28.58 28.58 53-98 53-9853.98 53-9853-98 53-98 Mm. 305 305 406 406 406 406 406 406 457 457 610 610 813 813 ENGLISH UNITS. T-5 'O ?? 5,000 feet. Ins. 44 7 7zo 10 10 10 10 10 18 18 20 20 Ins. 8 10 12 12 10 10 16 16 16 16 a Ins. Q Ins. 16 16 16 16 18 24 24 24 24 32 36 36 5O 50 °j= « re ^ 3,Ins. 4 44 47 7 10 10 10 10 10 10 16 16 914 miMm. 102 102 102 102 178 178 254 254 254 254 254 254 406 406 5 3,000 feet.Ins. 8 8 10 10 12 12 IO 10 16 16 jtres.Mm. 203 203 254 254 305 305 203 203 203 203 254 254 406 406 "3 § J-..G lo.ooo feet. Ins. 47 io IO IO 10 16 16 16 20 22 22 16 16 Ins. 10 10 10 10 16 18 18 26 26 o rt s Ins. Mm. 28.53 28.58 28.58 28.58 28.5828.58 28.5828.5S 53-98 53 -98 53.98 53-9S 53-98 53-98 Q Ins. 4 j 2j l\
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