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Aviation History
1928
1928 - 1112.PDF
SUPPLEMENT TOFLIGHT NOVEMBER 29, 1928 THE AIRCRAFT ENGINEER Figs. 24 and 25. On left, assembly jig for pyramid ends of radial struts. Below, assembly jig for double radial struts. m radial struts, no bolt holes were available for location purposes in the jig, and the method adopted was to spot face both sides of the stamping, and to have an extra piece stamped on to carry a locating hole over a pin on the jig. The remainder of the location was carried out by using a slot into which one lug of the stamping fitted. The sequence of operations was as follows : Spot mill both sides and face locating stamp- ing ; mark off as centre line ; drill and ream for locating peg ; mill end lug for location ; mill side lugs ; rough mill top jaws ; finish milling top jaws ; drill jaws, and drill for centre bolt; finish mill centre bolt bosses, and lighten. Oblique Sockets for Radial Struts.—The radial struts connect inner and outer ridge girders of the transverse " rings " or frames, and the sockets for them are in the form of aluminium die castings. They have to be milled and drilled to take up a series of angles ; there are two principal axes and the different parts are obtained by rotations around these axes. Photo- graphs illustrating these sockets and the jigs used will be found in Figs. 14, 15 and 16. The sequence of operations line ; spot face, then mill, drill and ream the lugs at vertices of triangle. These lugs are then used as location points for all subsequent work; rough mill angular lugs; lighten a special fixture is used for this, allowing quick clamping in any position, and accurate angle set in three dimensions); finish milling angular lugs, and drill these lugs in a milling is : Boring tube sockets; milling and drilling of lug ; and profiling of lug. Wiring Shackles.—Very large numbers of these are used, notably in the wire bracing of the main and frame longi- tudinals. They are in the form of steel stampings, and it is necessary to machine them so that the plane of the axis of the F Si Hi ffi SfiSi m Fig. 26. Assembly jig for frame longitudinals. m m m si s «S5 Si machine through the special fixture provided. Owing to the importance of the accurate production of these stampings, each has its appropriate part number stamped on it while in the jig, and this stamp is checked by an inspector against the jig setting. In the case of the inner ridge main joint stampings (see Jigs. 10. 11, 12 and 13), which connect inner ring joints with threaded holes and the intersection of these axes lies on the axis of the shackle end. Various jigs used are shown in Figs. 17 and 18. The sequence of operations is: Set stamping and file profile to template (see Fig. 17 (1) ). The stampings subsequently locate from this ; mill shackle end. This is a case where it has been found that the best method is to mill with vertical feed j^drill in drilling jig ; and tap in hand 1020w
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