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Aviation History
1933
1933 - 0866.PDF
74 SUPPLEMENT TO FLIGHT OCTOBER 26, 1933 THE AIRCRAFT ENGINEER Tmt Sheet V« /f^JO. AIRWORK ENGINE SERVICE LTD. HESTON AIRPORT. ENGINE MAKER'S NAME jfy* jfev<^W^, m — TYPE £y044y ~p/. NUMBER JJJ 3 NORMAL MAXIMUM POWER _ DIRECT 1 /^ITAIIfitt j FUEL USED; M*# &J S0JT RHP nf »fCOO R.P.M. ••/:•• 3S J. 4" a r>. It - 7 I -KM 4 ..... +t*t ^ ;; ... - :::: —M- i_ • • - •im - • ' - - — :: KW -- .. . t^r ~ ... w "r . TOW - r? ± IBM 3f s - i * • :.::; —~ «M ;:: — ii :::::: 1111111 A ~ -- -g IT •: . 1 — — rrsz „.,... P - - J-R.. » ::u _*+_ HT^Il' ijr 1 i n Q ill] i — ± : - -tR tlfM T2M 1J0C \m IS*) a ins im t«M aw n« zrro R.P.M. of CRANKSHAFT zwo ISM 2*w nto *.< Wg rfcommtnif t/it ute of Shell Lubricating Oils for ell overhaul*. c&O&JeJgl- AIRHORK ENGINE SERVICE LTD (Signed) Da. -J'-P-iA?"- A typical engine test sheet. meter tests for roundness and parallelism of journals, for general alignment. Any shaft which is not within the correct limits is set up and ground on the latest type of Churchill crankshaft grinding machine, which works regularly to limits of two thousandths of an inch. Undersize bearings are then fitted, and hand-fitting is reduced to a minimum by boring the bearings in a horizontal machine. Re-grinding of aero-engine cylinders is not, of course, permissible in all types, but some firms have fixed defi nite standards of oversizes to which the cylinders must be re-ground. Road-vehicle engines are much more sus ceptible to this treatment, and a great amount of work of this nature is being done. When inspecting a cylinder a dial gauge is used, and six measurements are taken, two at the top, two in the middle, and two at the bottom. In this way ovality and taper are deter mined. Two extremely interesting machines are used for boring and honing cylinders. These are Meyer & Schmidt planetary borers and honers, and are of the vertical type, with hydraulic control from an Enor Irydraulic oil turbine at the top of the machine. W7hen the cylinder has been bolted down to the table of the machine with a special jig, to ensure that the cylinder bore is at right^angles, the boring bar is brought down to within a few inches of the cylinder and rotated by hand until the cylinder is dead central with the axis of the boring bar. So accurate is the adjustment on this machine that a cylinder which has worn 0.009 in. AT HESTON : Beginning the dismantling of an Armstrong- Siddeley engine. (FLIGHT Photos.) will clear up to an oversize of 0.010 in. When the cylinder has been re-bored, it is accurately machined within li thousandths of an inch of the finished over size, correct in parallelism and concentricity within two- tenths of a thousandth. Two stages of honing are then employed, and the cylinder leaves the machine with a mirror finish. Space does not permit of following all the engine parts through the shops, but one or two interesting methods deserve to be mentioned, such as the synchro nisation of the two magnetos. An electrical instrument is so arranged that an electric circuit is made by the breaking of the contact-breaker, and by means of a small battery and a flashlight bulb for each magneto, the timing can be adjusted until the two bulbs light at the same instant. Previously, it was necessary to HYDRAULICALLY OPERATED : The boring bar, controls etc., of the Meyer and Schmidt machine. Expansion f» the hones can be carried out without stopping the macnine. 1072/
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