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Terminology for gears
users. Part 4 'Measuring and testing procedures' defines the attributes of piston rings and specifies basic testing methods. Part 5 'Ring grooves' specifies dimensions, limits, and measuring methods for grooves to suit the piston rings specified in Part I. The forthcoming Part 2 will deal with designs, dimensions, materials, and designations for multipiece oil control rings. BS 5341 (Part 1 : £6.60; Part 3: £2.70; Part 4: £4.70; Part 5: £4.70) is available from BSI Sales Department, 101 Pentonville Road, London N1 9ND,
Properties of plastics Use of plastics in engineering is increasing. It has been estimated that by 1980 the volume, if not the weight, of plastics consumed throughout the world will exceed that of all metals. Much of the available data on plastics may not necessarily be relevant to engineering designers. For example, some of the information on mechanical properties is based on standard tests devised for quality control. 'The Engineering Properties of Plastics' by R.M. Ogorkiewicz aims to give designers a better appreciation of plastic materials. It reviews the nature of polymers and considers the development, applications, and limitations of plastics. The bulk of the design guide is devoted to discussion of the mechanical, chemical, and physical properties of plastics, giving as exarhples, data for some common materials. Published under the sponsorship of the Design Council, the British Standard Institute, and the Council of Engineering Institutions, the guide is available, price £1.50, from Oxford University Press, 37 Dover Street, London WlX 4AH, UK
Grinding carbides Resin-bonded diamond grinding wheels are commonly used to grind hard materials such as tungsten carbide. Developments in diamond synthesis have reached the stage where
134
crystals can, essentially, be tailor-made to suit most abrasive applications. 'CDA - the new high performance diamond abrasive for grinding carbide' contains two papers on the use of synthetic diamonds. The first paper consid6rs the fundamental requirements for grits in resin-bonded grinding wheels. The influence of particle shape, strength, and crystal structure on bond retention and grinding efficiency is discussed.
Abrasive machining It has been suggested that abrasive machining has the greatest potential of all industrial metal-cutting operations in the near future. In the UK, the Science Research Council is supporting a comprehensive programme of research to advance grinding technology.
grinding of various grades of cemented tungsten carbide. Based on tests carried out at De Beers Technical Service Centre, the paper discusses the relative merits of the various grades and compares G-ratios and power with an "Industry Norm".
The programme is devoted to the economics of abrasive machining: the aim is to achieve high metal removal rates while maintaining or improving surface finish, accuracy, and integrity. At a recent conference in Birmingham, the programme was described in detail, and future trends in grinding technology were suggested. Results from the programme on heavy-duty grinding accuracy, finish and surface integrity, economics, adaptive control, and the selection and application of grinding wheels and fluids were presented.
The booklet is available, free, from The Industrial Diamond Information Bureau, Charters, Sunninghill, Ascot, Berkshire SL5 9PX, UK
Bound sets of the papers are available price £10.00, from MTIRA, Hulley Road, Macclesfield, Cheshire SK10 2NE, UK
The second paper gives examples of the performance of uncoated and metal clad CDA in wet and dry
Terminology for gears The new edition of BS 2519 'Glossary for gears replaces the UK national glossary with standard terminology established by the International Organisation for Standardization. Part 1 'Geometrical def'mitions' complements British Standards for gears and allied subjects, which include a number of recently revised standards dealing with gear cutting tools. It implements ISO/R 1122 and an addendum to the latter which gives terms for worm gears. Part 2 'Notation' implements the international gear notation in ISO 701, which specifies symbols for geometrical data, and is also complementary to a number of recently revised British Standards. An annex to Part 2 gives lists, classified in Roman and Greek alphabetical order, of the basic letter symbols and of the suffixes and signs which have been used in this standard. BS 2519 (Part 1: £6.60; Part 2: £1.60) may be obtained from BSI Sales Department, 101 Pentonville Road, London N1 9ND, UK
TRIBOLOGY international April 1977
Speciality lubricants Inherent limitations of conventional oils and greases have focussed some attention on the so-called 'speciality lubricants'. Increasing interest in this area of lubrication technology has been complemented by a steadily expanding range of products. E/M lubricants have issued a brochure on ten of their 'speciality lubricants'. The brochure claims that the lubricants are "needed at extremes of temperature or where heavy loads or slow speeds are involved." The lubricants may be used on threaded connections or press fits, in dirty or dusty environments, and during running-in of new and rebuilt equipment. A brief description of the ten lubricants is given, and a table recommending products for particular applications is included. For more information contact E/M Lubricants Inc, PO Box 220, West Lafayette, Indiana 47906, USA
Properties of plastics Use of plastics in engineering is increasing. It has been estimated that by 1980 the volume, if not the weight, of plastics consumed throughout the world will exceed that of all metals. Much of the available data on plastics may not necessarily be relevant to engineering designers. For example, some of the information on mechanical properties is based on standard tests devised for quality control. 'The Engineering Properties of Plastics' by R.M. Ogorkiewicz aims to give designers a better appreciation of plastic materials. It reviews the nature of polymers and considers the development, applications, and limitations of plastics. The bulk of the design guide is devoted to discussion of the mechanical, chemical, and physical properties of plastics, giving as exarhples, data for some common materials. Published under the sponsorship of the Design Council, the British Standard Institute, and the Council of Engineering Institutions, the guide is available, price £1.50, from Oxford University Press, 37 Dover Street, London WlX 4AH, UK
Grinding carbides Resin-bonded diamond grinding wheels are commonly used to grind hard materials such as tungsten carbide. Developments in diamond synthesis have reached the stage where
134
crystals can, essentially, be tailor-made to suit most abrasive applications. 'CDA - the new high performance diamond abrasive for grinding carbide' contains two papers on the use of synthetic diamonds. The first paper consid6rs the fundamental requirements for grits in resin-bonded grinding wheels. The influence of particle shape, strength, and crystal structure on bond retention and grinding efficiency is discussed.
Abrasive machining It has been suggested that abrasive machining has the greatest potential of all industrial metal-cutting operations in the near future. In the UK, the Science Research Council is supporting a comprehensive programme of research to advance grinding technology.
grinding of various grades of cemented tungsten carbide. Based on tests carried out at De Beers Technical Service Centre, the paper discusses the relative merits of the various grades and compares G-ratios and power with an "Industry Norm".
The programme is devoted to the economics of abrasive machining: the aim is to achieve high metal removal rates while maintaining or improving surface finish, accuracy, and integrity. At a recent conference in Birmingham, the programme was described in detail, and future trends in grinding technology were suggested. Results from the programme on heavy-duty grinding accuracy, finish and surface integrity, economics, adaptive control, and the selection and application of grinding wheels and fluids were presented.
The booklet is available, free, from The Industrial Diamond Information Bureau, Charters, Sunninghill, Ascot, Berkshire SL5 9PX, UK
Bound sets of the papers are available price £10.00, from MTIRA, Hulley Road, Macclesfield, Cheshire SK10 2NE, UK
The second paper gives examples of the performance of uncoated and metal clad CDA in wet and dry
Terminology for gears The new edition of BS 2519 'Glossary for gears replaces the UK national glossary with standard terminology established by the International Organisation for Standardization. Part 1 'Geometrical def'mitions' complements British Standards for gears and allied subjects, which include a number of recently revised standards dealing with gear cutting tools. It implements ISO/R 1122 and an addendum to the latter which gives terms for worm gears. Part 2 'Notation' implements the international gear notation in ISO 701, which specifies symbols for geometrical data, and is also complementary to a number of recently revised British Standards. An annex to Part 2 gives lists, classified in Roman and Greek alphabetical order, of the basic letter symbols and of the suffixes and signs which have been used in this standard. BS 2519 (Part 1: £6.60; Part 2: £1.60) may be obtained from BSI Sales Department, 101 Pentonville Road, London N1 9ND, UK
TRIBOLOGY international April 1977
Speciality lubricants Inherent limitations of conventional oils and greases have focussed some attention on the so-called 'speciality lubricants'. Increasing interest in this area of lubrication technology has been complemented by a steadily expanding range of products. E/M lubricants have issued a brochure on ten of their 'speciality lubricants'. The brochure claims that the lubricants are "needed at extremes of temperature or where heavy loads or slow speeds are involved." The lubricants may be used on threaded connections or press fits, in dirty or dusty environments, and during running-in of new and rebuilt equipment. A brief description of the ten lubricants is given, and a table recommending products for particular applications is included. For more information contact E/M Lubricants Inc, PO Box 220, West Lafayette, Indiana 47906, USA