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Aviation History
1975
1975 - 2395.PDF
FLIGHT International, 30 October 1975 667 SYSTEMS ing runs exactly true. The inner face has to be precisely aligned to allow the rotating shaft to turn freely and the outer face to give an exact fit in the surrounding component. The toler ances to which Barden works give an outside-diameter variation of only 0 0002in. The ball grooves have to be precisely aligned and are ground to within 25 millionths of an inch of perfect circularity. An important bearing-performance parameter is radial play (the amount of vertical movement by the inner ring when it is subjected to a given load, given that the bearing is vertical and the outer ring fixed). Radial play is selectable, one frequently specified giving a play of 0 0001in-0 0003in. The selection of the degree of play involves a compromise: high radial play promotes free rotation (0-0008in play is described .as "extra loose") but introduces high vibration levels which tend to shorten bearing life. Rigid inspection Automatic lathes work on the steel rod to form the rings to very close tolerances, making not only the ring, but also the groove to carry the ball. Constant quality control is essential and each batch is rigidly inspected through the various stages as the rings are further processed down to the required size. Each ring is measured, not only to ensure that it is within tolerance, but also to deter mine just where within the tolerance band it lies. At Bracknell Barden manufactures every bearing com ponent except for the balls them selves. Those Barden buys from another autonomous part of the parent company, incorporating them into the finished article in the super- clean assembly rooms of its factory. It is vital to the correct operation of the bearing that no foreign matter enters the rotating parts. Although the company confines itself to the manufacture of bearings with outside diameters of less than 30mm, it makes a wide number of options available to the customer. There are 72 basic combinations of outside diameter and bore, and 27 metric sizes. The lubricating medium is a technology in itself, although one or two are generally preferred: Barden offers over 80—^10 oils and 40 greases—to cover the full spec trum of environments. For appli cations in which the specification is crucial, the customer can specify the radial play and bore, outside-diameter tolerance codes (and those for other dimensions), and up to four functional tests on the complete item. A finished bearing—as small as Mn in diameter and having perhaps 10 components— is as precisely manufactured as modern mass-production techniques allow. Marconi Space and Defence Systems (Chelmsford, Essex) has signed an agreement with Norden under which the American company will propose to the US Army an artillery battery computer system using Marconi- designed equipment. The Army plans to replace the Field Artillery Digital Automatic Computer (Fadac) and to extend the capability of Tacfire; a request for proposals covering the new equipment is expected to be issued to industry in the near future. The Mk 10 and 12 ultrasonic flaw detectors manufactured by Ultra sonoscope (London) are available from stock, following the company's recent distributorship agreement with Inspection Instruments (NDT) (32 Duncan Terr, London Nl 8BR). The Radair Division of Dynair Elec tronics (6360 Federal Blvd, San Diego, Calif 92114) has introduced thelOVMB vehicle mounting bracket for easy fitting in airport vehicles of the Radair 10 VHF transceiver. The unit consists of a case, built-in speaker and hanger and costs $69. Stansaab Elektronik (Veddestavagen 13, S-175 62 Jarfalla, Sweden) has been awarded a SKr23 million (£2-5 million) contract by the German Pro curement Executive (BWB) for a radar simulator. It will be used to train Luftwaffe approach controllers. The simulator comprises a Censor 932 computer, together with PPI 850 and Alfaskop 3500 displays. ASEA (S-721 83 Vasteras, Sweden) has supplied a Quintus isostatic press, to the Middletown, Conn, plant of Pratt & Whitney. It will be used to press high-temperature superalloys from powdered metal. Alcan Aluminium (UK) (Alcan House, 30 Berkeley Sq, London W1X 6DP) has been awarded a contract by Haw ker Siddeley Dynamics for 100 tonnes of plate for machining and assemb ling into pallet units which will house experiments in Spacelab. This order, together with one placed earlier this year by Aeritalia, is worth £250,000. Mr Thor E. Stephenson and Mr Donald C. Lowe have been elected president and chief executive officer respectively of Pratt & Whitney Air craft of Canada. Mr George F. Cook has joined the AIL Division of Cutler-Hammer as deputy director, customer relations. Mr Stephen J. Moxley has been appointed vice-president and general manager of the newly established Avco Electronics Division. The com pany's Lycoming Engine Group has been expanded to include the Avco International Service Division. Mr K. McLaughlin has been ap pointed technical sales engineer of Inspection Instruments (NDT). Mr Harold M. May has been elected president of Electronic Communica tions. Mr Derek John, sales and service director, is resigning from the board of the British Aircraft Corporation's Commercial Aircraft Division in order to take up an appointment elsewhere in the aerospace industry. He will leave the corporation on December 31, Mr G. Hanby assuming responsibility for sales and service. Mr W. R. Burrows has been ap pointed a vice-president of Aviquipo with responsibility for northern Europe. C. Brocklehurst & Son, chartered loss adjusters and surveyors, have formed Brocklehurst Aviation with Mr John Derbyshire as managing partner. Matbro (Matbro House, Horley, Surrey) has recently delivered this 26,0001b model Y260 fork-lift truck modified to meet the require ments of Gatwick Handling. The company needed a lift of 16ft 6in to reach aircraft sills and a closed height of I60in to ensure access to all warehouses. The side-mounted cob en hances operator visibility during aircraft loading. Operating time with two 401b gas bottles is I0-I2hr
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