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Lucas, a Clear Leader in Window Production.

Lucas, a Clear Leader in Window Production. kinematically on the floor so that changes in the flatness of the concrete floor have little effect on any misalign­ ment within the base structure of the Lucas, a Clear machine. The machine design resembles a traditional record-player with the Leader in Window workpiece on the turntable and the polishing head mounted in the oscillating arm. There is, therefore, a considerable mass associated with the arm and Production.(?) polishing heads. In order to ensure smooth oscillation of the arm backlash- free gearboxes were designed for use in the table drive and for the oscillating motion of the arm. IF you have ever peered out of the ing cycle. Each process is important but All control and interlocking is via a windows of the passenger section of a none more so than the grinding and programmable logic controller. Sinu­ civil aircraft you will know that they are polishing which produces optical-stan­ soidal arm oscillation is carried through too small and usually in the wrong dard, flat acrylic sheets. from the previous design and acceleration place. The Eiffel Tower is only visible At Lucas Aerospace a demand for and deceleration rates of the polishing from the other side of the compartment, more capacity from their grinding/ arm, and the distance over which the the wing blocks the view and the polishing machines had built up. In accelerations take place, are variable. window is misted over. The front of the addition there was a call for machines This allows Lucas engineers to optimise aircraft is a completely different propo­ capable of machining much larger the production process for consistent sition, particularly if the aircraft is workpieces . Lucas commissioned quality across the full sheet, a distance military with a speed of up to Mach 2.5 AMTRI (Advanced Manufacturing of up to four metres. and a ceiling of 20,000 metres. Here the Technology Research Institute) of Spindle power monitoring is incor­ window, or "transparency" to give it the Macclesfield, Cheshire to design and porated as a further means of maintaining correct name, is an integral part of the detail a completely new machine. Their required machining conditions and structure. background as MTIRA (Machine Tool handling facilities are provided for Industry Research Association), and the To perform satisfactorily transparen­ changing the polishing and grinding consequent knowledge of machine tool cies must be structurally dependable, heads. design represented the required tech­ have superb optical properties, maintain Working from the design and detailed nology. A move in recent years towards perfect shape and aerodynamic form, drawings provided by AMTRI two increased contract income from industry resist bird-strikes and still have low machines were built by Crawford-Swift demonstrated an ability to complete installed weights. All these factors must Ltd of Halifax. They were successfully such projects effectively and efficiently. be combined with competitive prices installed and commissioned at Luton, and low running costs. providing Lucas Aerospace with a At Luton, Lucas Aerospace operate Fresh look complete new facility for transparency as European leaders in acrylic-based AMTRI was commissioned to take a material preparation. windows and their transparencies meet fresh look at the machine design; to all recognised specifications for successful keep the same basic operating features Advanced Manufacturing Technol­ service life under the most stringent yet incorporating its experience and ogy Research Institute, Hulley Road, environmental conditions. It is not expertise in structural design, mechan­ Macclesfield, Cheshire SK10 2NE. surprising, therefore, that they maintain isms, electronics and sensors. Tel: 0625 25421. an attitude of continuous investment, Perhaps the most important aspect of technical innovation and programmed the machine is the alignment of the manufacturing development, both in- plane of movement of the polishing house and in conjunction with approp­ head with the plane of the rotating table. riate external organisations. Without accuracy here the sheets would not meet the demands for flatness and The finished transparency is the result uniform thickness. As in many traditional of a wide range of high-tech processes workplaces the machines are mounted including bonding, laminating, forming by application of precisely controlled on a concrete floor. Fortunately AMTRI has researched the use of concrete in forces at predetermined temperatures, structures for many years and has peripheral machining and edge finishing. showed that the presence of water Heating elements are incorporated and produces small, yet highly significant vacuum deposited gold film is applied. Metal oxide coatings combine high light changes in the material. Water is a principal component of the grinding transmission characteristics with abra­ process and so the effects of contamina­ sion resistance and required electrical tion of the concrete by water on the properties. An electrically anti-iced, machine had to be removed. The base of laminated, bird-proof, pressure-resistant cockpit window can have as many as 10 the new machine is, therefore, designed to be aligned readily and is supported significant stages during its manufactur­ 8 AIRCRAFT ENGINEERING — September 1990 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Lucas, a Clear Leader in Window Production.

Aircraft Engineering and Aerospace Technology , Volume 62 (9): 1 – Sep 1, 1990

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb036989
Publisher site
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Abstract

kinematically on the floor so that changes in the flatness of the concrete floor have little effect on any misalign­ ment within the base structure of the Lucas, a Clear machine. The machine design resembles a traditional record-player with the Leader in Window workpiece on the turntable and the polishing head mounted in the oscillating arm. There is, therefore, a considerable mass associated with the arm and Production.(?) polishing heads. In order to ensure smooth oscillation of the arm backlash- free gearboxes were designed for use in the table drive and for the oscillating motion of the arm. IF you have ever peered out of the ing cycle. Each process is important but All control and interlocking is via a windows of the passenger section of a none more so than the grinding and programmable logic controller. Sinu­ civil aircraft you will know that they are polishing which produces optical-stan­ soidal arm oscillation is carried through too small and usually in the wrong dard, flat acrylic sheets. from the previous design and acceleration place. The Eiffel Tower is only visible At Lucas Aerospace a demand for and deceleration rates of the polishing from the other side of the compartment, more capacity from their grinding/ arm, and the distance over which the the wing blocks the view and the polishing machines had built up. In accelerations take place, are variable. window is misted over. The front of the addition there was a call for machines This allows Lucas engineers to optimise aircraft is a completely different propo­ capable of machining much larger the production process for consistent sition, particularly if the aircraft is workpieces . Lucas commissioned quality across the full sheet, a distance military with a speed of up to Mach 2.5 AMTRI (Advanced Manufacturing of up to four metres. and a ceiling of 20,000 metres. Here the Technology Research Institute) of Spindle power monitoring is incor­ window, or "transparency" to give it the Macclesfield, Cheshire to design and porated as a further means of maintaining correct name, is an integral part of the detail a completely new machine. Their required machining conditions and structure. background as MTIRA (Machine Tool handling facilities are provided for Industry Research Association), and the To perform satisfactorily transparen­ changing the polishing and grinding consequent knowledge of machine tool cies must be structurally dependable, heads. design represented the required tech­ have superb optical properties, maintain Working from the design and detailed nology. A move in recent years towards perfect shape and aerodynamic form, drawings provided by AMTRI two increased contract income from industry resist bird-strikes and still have low machines were built by Crawford-Swift demonstrated an ability to complete installed weights. All these factors must Ltd of Halifax. They were successfully such projects effectively and efficiently. be combined with competitive prices installed and commissioned at Luton, and low running costs. providing Lucas Aerospace with a At Luton, Lucas Aerospace operate Fresh look complete new facility for transparency as European leaders in acrylic-based AMTRI was commissioned to take a material preparation. windows and their transparencies meet fresh look at the machine design; to all recognised specifications for successful keep the same basic operating features Advanced Manufacturing Technol­ service life under the most stringent yet incorporating its experience and ogy Research Institute, Hulley Road, environmental conditions. It is not expertise in structural design, mechan­ Macclesfield, Cheshire SK10 2NE. surprising, therefore, that they maintain isms, electronics and sensors. Tel: 0625 25421. an attitude of continuous investment, Perhaps the most important aspect of technical innovation and programmed the machine is the alignment of the manufacturing development, both in- plane of movement of the polishing house and in conjunction with approp­ head with the plane of the rotating table. riate external organisations. Without accuracy here the sheets would not meet the demands for flatness and The finished transparency is the result uniform thickness. As in many traditional of a wide range of high-tech processes workplaces the machines are mounted including bonding, laminating, forming by application of precisely controlled on a concrete floor. Fortunately AMTRI has researched the use of concrete in forces at predetermined temperatures, structures for many years and has peripheral machining and edge finishing. showed that the presence of water Heating elements are incorporated and produces small, yet highly significant vacuum deposited gold film is applied. Metal oxide coatings combine high light changes in the material. Water is a principal component of the grinding transmission characteristics with abra­ process and so the effects of contamina­ sion resistance and required electrical tion of the concrete by water on the properties. An electrically anti-iced, machine had to be removed. The base of laminated, bird-proof, pressure-resistant cockpit window can have as many as 10 the new machine is, therefore, designed to be aligned readily and is supported significant stages during its manufactur­ 8 AIRCRAFT ENGINEERING — September 1990

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: Sep 1, 1990

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