How an aeroplane is built . on. On the sides of thisshort piece of ash two chocks, each 9 by 3^ in. by 2 in., will be glued andbolted. And further, through the edge ofthis piece of ash, which is 3 in. thick, willbe drilled a f-in. hole. This is for the to pass through, to which thecable which has to be stretched is attached. At the other end of the 16-ft. timberswill be fixed a 10 to 1 bell crank-lever, orcombination of levers. The short end willproject upwards between the two 9 in. by2 in. timbers, and to this will be fixed asuitable swivel link to which to attach th
How an aeroplane is built . on. On the sides of thisshort piece of ash two chocks, each 9 by 3^ in. by 2 in., will be glued andbolted. And further, through the edge ofthis piece of ash, which is 3 in. thick, willbe drilled a f-in. hole. This is for the to pass through, to which thecable which has to be stretched is attached. At the other end of the 16-ft. timberswill be fixed a 10 to 1 bell crank-lever, orcombination of levers. The short end willproject upwards between the two 9 in. by2 in. timbers, and to this will be fixed asuitable swivel link to which to attach thecables. At the long end of the lever arrange-ments and fittings will be made for attach-ing a spring balance, capable of readingup to a load of at least 300 lbs. This willbe used for the purpose of indicating the 175 HOW AN AEROPLANE IS BUILT amount of strain to which the cable is beingstrained. (See Fig. 30.) The many uses for testing purposes towhich this machine can be put, and thevaluable data obtained thereby, quickly. CABLE TESTING OR STRETCHING MACHINE Fig. 30. repay its cost. The use of one of thesemachines is badly needed in most worksusing cables and ropes. It is easily made,and cannot get out of order. Also, accu-rate readings can be obtained by any intel-ligent person. CHAPTER XVII CASTLE NUTS AND THEIR MANUFACTURE. Regarding the use of nuts, it frequentlyhappens that castellated nuts have tobe used, and, assuming that supplies haverun out, which occasionally happens, itmay cause considerable delay in waitingfor further supplies from the actual manu-facturers. Therefore, having describedin the Tenth Instalment of this article themethod generally adopted for makingsmall bolts, it may be as well to add in thisInstalment a method frequently adoptedfor cutting the slots of castellated nuts. A small or large plain milling machinewill be utilised for this purpose, To the table of the machine attach amachine-vice, and in between the jaws laya rectangular bar of mild steel
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Keywords: ., bookcentury1900, bookdecade1910, bookidhowa, booksubjectairplanes
