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Tools for the Workshop

Tools for the Workshop dihedral of the wing or following the angle of the fusel­ age. An alternative arrangement is to have one Safety Raiser at the leading edge of the wing and one for servicing the trailing edge. These two units can be connected by a bridging unit under or over the wing A Selection of Equipment of Use in the Production so that servicing can be carried out without walking on the wing. The cantilever version of the Safety and Maintenance of Aircraft and Components Raiser can also be seen in the diagram, in front of the port wing. This is of use in reaching across the top of the wing, and the boom can be adjusted to suit the angle of incidence of the wing. Engine Tilting Sling Within this system of staging it is possible to remove Aircraft radial engines are normally crated and units of moderate size and weight from the aircraft shipped in a vertical position, and a considerable (e.g. a tail plane); if necessary a jib can be fitted to the amount of handling is necessary to turn them into Giraffe for this purpose. The docking units can be the horizontal position for fitting to an aircraft or mounted on caterpillar tracks for moving across on a stand. In order to facilitate this operation, Aero- aerodromes and rough country, and the system can contacts Ltd. of Gatwick, Surrey, have produced an be dismantled for transport by sea or air. engine tilting sling. This has an arched sliding beam which enables the engine to be turned through 90 deg. in the vertical plane. When this has been done the Jet Engine Hoist propeller shaft attaching nut can be removed so that A portable hoist for jet engines has been developed the engine can be turned through 360 deg. in a hori­ for North American Aviation Inc. by two Californian zontal plane. If necessary the sling will hold the engine engineering firms. It consists of a cold-drawn seamless in any tilted position within the 90 deg. of travel of the steel tubing frame 14 ft. 4 in. high, 6 ft. 11 in. wide and beam. 14 ft. 5 in. long with tow bar extended, supporting a hand-operated 4-ton chain hoist. The frame is fitted with rubber tyred castors and rests on hand-operated crank levelling jacks when in use. Two men are re­ quired to operate the hoist, which will handle any engine used in North American Aviation aircraft. The operators can dismantle it into five parts for transporting. Net weight is 840 lb. and gross weight crated is 1,230 lb. The assembly and chains are proof- loaded to 11,000 lb. springs of the sensitive carriage. When the gears are rotated the dial indicator shows any variation in con­ centricity or tooth thickness, while the centre distance is read on the vernier scale. For repetition work the adjustable carriage can be returned to the same start­ ing position by using a stop fitted to the bed. Backlash can be calculated by noting the difference between the working centre distance and the centre distance when the gears are in metal-to-metal contact. The case size of the Scoba sling is 5 ft. 9 in. × 1 ft. Adjustable Docking Scheme 9 in. × 7 in. and its weight is approximately ¾ cwt. By means of interchangeable adapters and slings it An adjustable docking scheme is now being pro­ can be used to handle any radial engine up to the size G.E.C. Floor Boxes duced by Access Equipment Ltd., Braemar Avenue, of the Pratt and Whitney R·1830, and a larger model London, N.W.10. The company, working in con­ Power and air supplies to the new assembly line of is under development. junction with B.O.A.C., has developed a combination the Gloster Aircraft Co. Ltd. are provided through a of its Giraffe and Safety Raiser hydraulic working new type of floor box designed and manufactured by Gear Roll Tester platforms in order to provide a staging of varying the General Electric Co. Ltd. In order to withstand heights for working on aircraft. The Safety Raiser possible dampness, flooding and sweating, the boxes' First of a range to be built by the David Brown works on the scissors principle and several can be traps and lids are made of non-corroding cast alu­ Tool Company Huddersfield, the No. 24 gear roll connected by the use of bridging units, which allow minium alloy, while the boxes are made of heavy tester is designed to provide a simple and rapid means the platform height to be varied, making it possible gauge mild steel, hot-spelter-galvanized. The interiors of checking concentricity, tooth contact, centre to have a continuous stage rising in sections up the are coated with Corktex paint, which is proof against distance and varying tooth thickness of gears up to sweating and condensation. Armoured cable brings 24 inches. External or internal spur and helical gears electrical supplies to the boxes, where it is taken to are accommodated by the standard model, while the sockets by P.V.C. insulated cable. Each box con­ separate heads—mounted on the adjustable carriage— tains three 6-amp. watertight sockets and a watertight are available for shaft gears, bevel gears and worm controlling switch, and measures approximately gears. The machine, which is simple in design and 17 in. × 8 in. × 8 in. It can sustain a load of 30 tons. operation, and of a high standard of precision, can be used for repetition work, using a master gear, or for checking master gears themselves. The tester consists of three main components: the bed, the adjustable carriage and the sensitive carriage. The bed, of ribbed construction for rigidity, has slide- ways for locating the two carriages. The adjustable carriage is moved by a handwheel, and can be locked in any desired position; a vernier scale is fitted. The sensitive carriage operates against a variable spring pressure, which can be exerted in either direction to allow for external and internal gearing. A dial indi­ cator, which is adjustable, registers variations in concentricity and tooth thickness. Centre distances are checked on the vernier scale fitted to the adjust­ able carriage. Gears are tested by rotating them together in pairs. It is recommended that when quantities of gears are being tested one of the gears should be a master. In order to ensure freedom of movement and minimum wear it is advisable to place the less heavy gear on the sensitive carriage. The adjustable carriage is moved along the bed until the gears mesh, and clamped in a position where it will exert a slight pressure on the May 1955 167 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Tools for the Workshop

Aircraft Engineering and Aerospace Technology , Volume 27 (5): 1 – May 1, 1955

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb032556
Publisher site
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Abstract

dihedral of the wing or following the angle of the fusel­ age. An alternative arrangement is to have one Safety Raiser at the leading edge of the wing and one for servicing the trailing edge. These two units can be connected by a bridging unit under or over the wing A Selection of Equipment of Use in the Production so that servicing can be carried out without walking on the wing. The cantilever version of the Safety and Maintenance of Aircraft and Components Raiser can also be seen in the diagram, in front of the port wing. This is of use in reaching across the top of the wing, and the boom can be adjusted to suit the angle of incidence of the wing. Engine Tilting Sling Within this system of staging it is possible to remove Aircraft radial engines are normally crated and units of moderate size and weight from the aircraft shipped in a vertical position, and a considerable (e.g. a tail plane); if necessary a jib can be fitted to the amount of handling is necessary to turn them into Giraffe for this purpose. The docking units can be the horizontal position for fitting to an aircraft or mounted on caterpillar tracks for moving across on a stand. In order to facilitate this operation, Aero- aerodromes and rough country, and the system can contacts Ltd. of Gatwick, Surrey, have produced an be dismantled for transport by sea or air. engine tilting sling. This has an arched sliding beam which enables the engine to be turned through 90 deg. in the vertical plane. When this has been done the Jet Engine Hoist propeller shaft attaching nut can be removed so that A portable hoist for jet engines has been developed the engine can be turned through 360 deg. in a hori­ for North American Aviation Inc. by two Californian zontal plane. If necessary the sling will hold the engine engineering firms. It consists of a cold-drawn seamless in any tilted position within the 90 deg. of travel of the steel tubing frame 14 ft. 4 in. high, 6 ft. 11 in. wide and beam. 14 ft. 5 in. long with tow bar extended, supporting a hand-operated 4-ton chain hoist. The frame is fitted with rubber tyred castors and rests on hand-operated crank levelling jacks when in use. Two men are re­ quired to operate the hoist, which will handle any engine used in North American Aviation aircraft. The operators can dismantle it into five parts for transporting. Net weight is 840 lb. and gross weight crated is 1,230 lb. The assembly and chains are proof- loaded to 11,000 lb. springs of the sensitive carriage. When the gears are rotated the dial indicator shows any variation in con­ centricity or tooth thickness, while the centre distance is read on the vernier scale. For repetition work the adjustable carriage can be returned to the same start­ ing position by using a stop fitted to the bed. Backlash can be calculated by noting the difference between the working centre distance and the centre distance when the gears are in metal-to-metal contact. The case size of the Scoba sling is 5 ft. 9 in. × 1 ft. Adjustable Docking Scheme 9 in. × 7 in. and its weight is approximately ¾ cwt. By means of interchangeable adapters and slings it An adjustable docking scheme is now being pro­ can be used to handle any radial engine up to the size G.E.C. Floor Boxes duced by Access Equipment Ltd., Braemar Avenue, of the Pratt and Whitney R·1830, and a larger model London, N.W.10. The company, working in con­ Power and air supplies to the new assembly line of is under development. junction with B.O.A.C., has developed a combination the Gloster Aircraft Co. Ltd. are provided through a of its Giraffe and Safety Raiser hydraulic working new type of floor box designed and manufactured by Gear Roll Tester platforms in order to provide a staging of varying the General Electric Co. Ltd. In order to withstand heights for working on aircraft. The Safety Raiser possible dampness, flooding and sweating, the boxes' First of a range to be built by the David Brown works on the scissors principle and several can be traps and lids are made of non-corroding cast alu­ Tool Company Huddersfield, the No. 24 gear roll connected by the use of bridging units, which allow minium alloy, while the boxes are made of heavy tester is designed to provide a simple and rapid means the platform height to be varied, making it possible gauge mild steel, hot-spelter-galvanized. The interiors of checking concentricity, tooth contact, centre to have a continuous stage rising in sections up the are coated with Corktex paint, which is proof against distance and varying tooth thickness of gears up to sweating and condensation. Armoured cable brings 24 inches. External or internal spur and helical gears electrical supplies to the boxes, where it is taken to are accommodated by the standard model, while the sockets by P.V.C. insulated cable. Each box con­ separate heads—mounted on the adjustable carriage— tains three 6-amp. watertight sockets and a watertight are available for shaft gears, bevel gears and worm controlling switch, and measures approximately gears. The machine, which is simple in design and 17 in. × 8 in. × 8 in. It can sustain a load of 30 tons. operation, and of a high standard of precision, can be used for repetition work, using a master gear, or for checking master gears themselves. The tester consists of three main components: the bed, the adjustable carriage and the sensitive carriage. The bed, of ribbed construction for rigidity, has slide- ways for locating the two carriages. The adjustable carriage is moved by a handwheel, and can be locked in any desired position; a vernier scale is fitted. The sensitive carriage operates against a variable spring pressure, which can be exerted in either direction to allow for external and internal gearing. A dial indi­ cator, which is adjustable, registers variations in concentricity and tooth thickness. Centre distances are checked on the vernier scale fitted to the adjust­ able carriage. Gears are tested by rotating them together in pairs. It is recommended that when quantities of gears are being tested one of the gears should be a master. In order to ensure freedom of movement and minimum wear it is advisable to place the less heavy gear on the sensitive carriage. The adjustable carriage is moved along the bed until the gears mesh, and clamped in a position where it will exert a slight pressure on the May 1955 167

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: May 1, 1955

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