How an aeroplane is built . ur pur-137 HOW AN AEROPLANE IS BUILTpose, of mild steel stampings. These, ofcourse, must be machined all over, and thelugs, where the hinge pins pass through,carefully machined to a specified anglewith the rest of the bracket so as to give thewings the required angle of incidence. The best way to machine these is toclamp them to a machining jig on the bedof the table of a milling machine, aboutfour at a time, and pass a couple of sideand face milling cutters past the jaws ofthe stamping, and then mill out the centreportion with a single cutter. When thiswork is comp
How an aeroplane is built . ur pur-137 HOW AN AEROPLANE IS BUILTpose, of mild steel stampings. These, ofcourse, must be machined all over, and thelugs, where the hinge pins pass through,carefully machined to a specified anglewith the rest of the bracket so as to give thewings the required angle of incidence. The best way to machine these is toclamp them to a machining jig on the bedof the table of a milling machine, aboutfour at a time, and pass a couple of sideand face milling cutters past the jaws ofthe stamping, and then mill out the centreportion with a single cutter. When thiswork is complete, they can be transferredto another jig and milling machine andhave the outside surfaces of the jawsmilled. This being done, the next thing to do isto mill the lug to the required angle, be-tween milling cutters, and then fix thebracket for drilling the hinge pin-hole ; thelightenings can then be drilled out andfinished with a round file. The only re-maining work to be done is the drilling. 138 HOW AN AEROPLANE IS BUILT. CHAPTER XI THE TAIL PLANE. The tail plane will now have to be con-sidered. For the purpose of this articleone may assume that the tail plane is al-most semi-circular in shape and that theframework is formed of light steel will be in four lengths; the first piecebeing straight, and forming the base ortrailing edge of the plane, two pieces oftube forming quarters of a circle on eachside, and one piece forming the centreportion of the leading edge, nearlystraight. It may be assumed that the diameter ofthe tube is about f in., and that it is about20 gauge. All joints have an internal linerpinned in position and brazed. This, of course, must be well done, andalthough the oxy-acetylene blowpipe is adelightful instrument to do brazing with,it may be just as well to point out to all con-cerned that its use for brazing is not al-lowed by the Of course, theremay be exceptions to the rule, but theseexceptions apply to special circumstances,which I d
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