How an aeroplane is built . rough theoperation of being milled. For this purpose it must be sent to themarker-off and be centred. It can then besent to the metal machine shop, where itwill be placed between the centres of asmall lathe, say a 6 in. centre engine the outside will be turned down tothe dimensions shown on the drawing. MILLING this, the stamping will be sent tothe milling machine to have the fork-endsmilled. For the purpose of holding thestamping, a heavy cast-iron jig had betterbe made, or a mild steel clamping jig (see149 HOW AN AEROPLANE IS BUILTFig.
How an aeroplane is built . rough theoperation of being milled. For this purpose it must be sent to themarker-off and be centred. It can then besent to the metal machine shop, where itwill be placed between the centres of asmall lathe, say a 6 in. centre engine the outside will be turned down tothe dimensions shown on the drawing. MILLING this, the stamping will be sent tothe milling machine to have the fork-endsmilled. For the purpose of holding thestamping, a heavy cast-iron jig had betterbe made, or a mild steel clamping jig (see149 HOW AN AEROPLANE IS BUILTFig. 25), which holds the socket-endfirmly, whilst the fork-ends project up-wards. Possibly it may be advantageousto mill about three fork-ends at once, andthe jig can be made accordingly if desired. The next thing to do is to set up themilling cutters on the spindle of the millingmachine. These will be side and face cutters, which means that they are capableof cutting on the flat face at the side as wellas on the X MILLING MACHINE TABLE 5ki0 fork in jig .Fig. 25. They can be so that they mill theoutside faces of the fork, and so there will,of course, be a fixed overall distance apart of the cutters must bemaintained by collars placed between thecutters on the spindle, and well tightenedup to prevent the cutters from slippingwhen the machine commences to cut, keysand keyways may be used. These two cutters will clean up the faces HOW AN AEROPLANE IS BUILTof the forks, after which the cutters can bereplaced with another couple of cutters tofinish the inside of the fork. Or, if thestock of milling cutters happens to be ex-tensive, possibly one of the right width canbe found which will guarantee the accu-racy of the width of the cut. EDGE next thing will be to finish the edgesof the fork. These can be done in thevice, with a file, by the fitters, but, ofcourse, the whole of the work can be doneon the milling machine, if the stock ofmill
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Keywords: ., bookcentury1900, bookdecade1910, bookidhowa, booksubjectairplanes
