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A Selection of Equipment of Use in the Production and Maintenance of Aircraft and Components Flame-and-Waterproof Terminal Distribution Box All incoming and outgoing cable connexions are made at the terminals on the underside of the terminal The General Electric Co. Ltd. has designed a flame- box. and-waterproof terminal distribution box for employ All the castings are of silicon aluminium alloy— ment where complex connexions and apparatus are LM6M to BS. 1490, sprayed with a preheatment used in wiring installations involving control and indi primer and one coat of grey paint. The dimensions of cating circuits; or for power circuits where higher the box are 13 in. × 5·9/16 in. × 6½in./deep; it weighs voltages and/or currents may be involved. It conforms 18½ lb. and, with standard entries and terminal to B.S.229 for gases of Buxton Groups II and III and arrangement, is priced at £26 8s. 4d. holds Flameproof Certificate-No. FLP.3468. The box is cast in aluminium alloy with two side Heavy Duty Lathe walls 1 in. thick, through which are drilled and tapped A 12¾ in. centre lathe has recently been completed the necessary apertures to accept conduit, flameproof by Denham's Engineering Co. Ltd, Empire Works, glands or cable scaling boxes. The box is normally Holmficld, Halifax. It is adaptable for copy-turning stocked already drilled with 14-1 in. E.T. entries, but long chucking jobs or work between centres, and for other arrangements of entry can be specially drilled. surface copying diameters up to 42 in. Machines can At one end of the box casting is a flat machined be supplied with lengths of bed varying to take work surface with a rectangular aperture blanked off by a of from 6 ft. to 10 ft. between centres, with a similar cover plate secured by four steel screws. By the length of copy-turning. Full size solid templates can removal of this coverplate it is possible for similar be mounted between centres on the template-carrying boxes to be rigidly bolted together to form a compo bed at the rear of the lathe, and carriers are also site unit, with a commensurate increase in the number provided for flat, sheet steel templates for both of entries, facilities for the interconnexion of cables longitudinal and transverse copying. A spring-loaded through the rectangular apertures, and provision of headstock centre is available for use with an 8 in. additional terminal arrangements. There are four capacity GF workdrivcr for shaft-type components. slotted feet for mounting the box. The lathe is normally fitted with 25 or 30 h.p. The box incorporates a solid aluminium alloy motor drive, but during tests a load of 36 h.p. was operator. Descent is limited to a safe speed even if casting machined overall for mounting terminals of registered while the machine was turning under one of the hydraulic lines is broken. Automatic cut the required size and number. The terminals, of plated hydraulic control. outs stop the motion if the platform moves beyond brass studding, are suitably bushed and secured in The copying slide is mounted at 45 deg. to the lathe set limits or descends on a solid obstruction. The position with lock nuts. The standard arrangement centre line and Metropolitan-Vickers hydraulic turntable is self-locking for safety when the carrier caters for a maximum of 52 terminals and a rating of equipment is fitted, the ram having an effective stroke vehicle is standing on a gradient. Outrigger jacks are 250 V between terminals at 7½amp. If higher voltages of 4½ in. providing 9 in. of diameter variation when used at the rear and sides of the vehicle, to which or heavier currents are to be handled, the size of parallel turning, within the range of 3 to 12 in. dia spring lock-outs are fitted to prevent movement of studding and the clearance between adjacent studs has meter. For surface copying the tool can be used in the rear springs. to be increased and panels specially drilled. The upper front of and, to a limited extent, behind the centre terminal, or disconnecting link compartment, is en The machine can be mounted on any chassis of line, so that re-entrant 90 deg. steps can be produced. 3 tons or over with twin rear wheels, on suitable road closed by a cast aluminium alloy cover. Swing over the bed is 25½ in., over the copying trailers, railway trucks, barges and pontoons. On a To exclude as far as possible the ingress of moisture slides 12 in. Swing in the gap is 47 in. by 18 in. wide normal chassis its height is 36 ft. from the ground. at the joint between the box, terminal base and cover, in front of a faceplate. Maximum horizontal extension from the centre of a continuous Neoprene gasket is tightly sprung around the turntable is 23 ft. the perimeter of the terminal bases. Being slightly Hydraulic Platform deeper than the terminal base, it forms a seal against the overlap of the box and cover, thus preventing the Earlier this year a mobile hydraulic platform was Lapping Machine direct passage of water and minimizing the condensa demonstrated outside the Royal Festival Hall. The Lapping to an accuracy of one light band using tion effect due to breathing. The seal at the faces manufacturers are Simon Hydraulic Machinery, a unskilled personnel is claimed for a lapping machine, between adjacent boxes, or the joint between the branch of Simon Engineering (Midlands) Ltd, of Mark IV, manufactured by FIexibox Limited, Nash separate cover plate and the box, should be served Queen's Cross, Dudley. The platform is operated by Road, Trafford Park, Manchester 17. The self- with petroleum jelly or an equivalent grease to ensure a Vickers Detroit hydraulic pump powered by a JAP contained machine is designed to lap articles made that this permanent joint remains substantially water 8·8 h.p. air cooled petrol engine. Movements are in materials ranging from soft non-metals to very tight throughout its life. controlled from the platform: raising and lowering hard metals. are done by means of pedals, while rotation is governed The box has been so arranged that the isolation of A rotary lapping plate of 21 in. diameter gives by a knee-operated bar. Duplicate controls are pro individual branch circuits of complex control circuits high-capacity loadings and corresponding rates. Some vided on the turntable. for testing is facilitated. Testing of the circuits is typical figures are given in the following table: carried out by the removal of links or wire connexion In the event of failure of the pump or the motor the (supplied by the user) in the upper terminal chamber. platform remains in position until lowered by the MACHIN E LOADIN G TABLE 2⅞" 3⅝" Maximum 1 5/16'' 1½'' 73mm. 92nim. diameter ¾'' 38mm. 2¼'' 33mm. of work 19mm. 57mm. Number per machine 99 57 42 21 12 6 loading The work to be lapped is held in three wear rings. In general, any articles which can be accommodated within a circle of 7¾ in. diameter can be lapped. The machine is fitted with a control device which automatically maintains the flatness of the lapping plate. Only one adjustment of the device is neces sary, thereafter the plate is continuously conditioned during operation. Loading and unloading are simple and the work pieces are protected from dust and grime by a transparent plastic hood. Once the control device has been correctly set the machine can be operated by unskilled personnel. With reasonable care the largest of parts for which the machine is suitable can be lapped to within one light band and two micro-inches rms surface finish. Dimensions: Width: 5 ft. 2 in. (1·58 metres) Depth: 2 ft. 9 in. (0·84 metres) Height: Overall 5 ft. 8 in. Table Top 3 ft. 2½ in. (0·98 metres) Weight: 1,120 lbs. (508 kgs.) 320 Aircraft Engineering
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Sep 1, 1955
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