Machining and Grinding: A Historical Review of the Classical Papers

1993 ◽  
Vol 46 (3) ◽  
pp. 80-132 ◽  
Author(s):  
R. Komanduri
Keyword(s):  
Metal Cutting ◽  
Historical Review ◽  
Living Standards ◽  
Michael Field ◽  
Tool Materials ◽  
The Us ◽  
Giant Step ◽  
Grinding Tool ◽  
Manufacturing Productivity ◽  
American Classic

Major contributions to machining and grinding research in the US came in the twentieth century. The seminal work by Frederick Winslow Taylor on the Art of Cutting Metals published in 1907 was the beginning of a series of serious and systematic studies on the various aspects of metal cutting and grinding in this century. This monumental work, which became an American classic, continues to inspire many a researcher in this field even today. It was followed by the works of other pioneers, including Orlan W Boston, Hans Ernst, M E Martellotti, Max Kronenberg, M Eugene Merchant, Milton C Shaw, Michael Field, John Kahles, K J Roubik, K Armitage, Ken Trigger, B T Chao, Alfred Schmidt, William W Gilbert, Fran Boulger, Lester Colwell, Carl Oxford, Erich Thomsen, Robert Hahn, and many others. Many of the associates of the pioneers including Nathan Cook, Iain Finnie, B F von Turkovich, Shiro Kobayaski, Inyong Ham, E Loewen, and others including W B Rice, S M Wu, and J Tlusty have made significant contributions to these fields in their own right. There is no doubt that this century will be heralded by the historians as the golden age of metal cutting and grinding research, particularly the period between 1940 and 1960. It was, however, M Eugene Merchant’s paper on the Basic Mechanics of the Metal Cutting Process in 1945 that took a giant step from the art of metal cutting to the science of metal cutting. This work laid the foundation for much of the work that is practiced today. It can be stated unequivocally that because of the significant contributions by the pioneers and their associates, metal cutting and grinding research today is rich in its heritage and contents, and has contributed towards the improvement of manufacturing productivity. It has thereby facilitated the improvement of living standards around the world. In this review, the following ten topics are addressed briefly: Physics of Machining; Mechanics of Machining; Shear and Friction in Machining; Thermal Aspects of Machining and Grinding; Tool Materials, Tool Wear, and Machinability; Multiple Cutting Points; Grinding; Vibrations in Machining; Surface Integrity; and Economics of Machining.

The World Bank and the politics of productivity: the debate on economic growth, poverty, and living standards in the 1950s

2011 ◽  
Vol 6 (1) ◽  
pp. 53-74 ◽  
Author(s):  
Michele Alacevich
Keyword(s):  
Economic Growth ◽  
International Organizations ◽  
Social Issues ◽  
Living Standards ◽  
Bretton Woods ◽  
The World Bank ◽  
Development Agenda ◽  
The Us ◽  
Multilateral Organizations ◽  
Post War

AbstractAccording to most reconstructions of development debates, poverty and social issues were not part of the development agenda until the late 1960s. In contrast, this article shows that development practitioners and institutions were already addressing poverty and social issues in the late 1940s and early 1950s. However, economic multilateral organizations soon marginalized those inclusive views and focused exclusively on economic growth. This article discusses those early policy options and why they were marginalized. It argues that this happened for ideological reasons, specifically because of the ideological anti-New Deal post-war backlash and the adhesion of Western countries and multilateral organizations to what Charles Maier defined as the politics of productivity. This ideological backlash explains the rise and early demise of Keynesian ideas in international organizations, and, conversely, their stronger influence in developing countries, where the direct influence of the US and Bretton Woods organizations was somewhat mitigated.

Sources of Increasing Inequality

2021 ◽  
pp. 172-190
Author(s):  
Francis Teal
Keyword(s):  
Two Dimensions ◽  
Labour Markets ◽  
Living Standards ◽  
The Political ◽  
Poor Countries ◽  
Unskilled Labour ◽  
The Us ◽  
The Uk ◽  
Rich Countries ◽  
The Impact

While all the evidence we have points to the rising living standards for most of the very poorest, the wages of unskilled labour in poor countries remain a fraction of those in rich countries. Those potential workers are seen as a threat to the living standards of the unskilled in rich countries and the political impetus to limit their access to those labour markets has been, and remains, one of the most potent issue in the politics of rich countries. This aversion to immigration as a threat to the wages of the unskilled often transmutes into a hostility to trade, as goods, which use a lot of unskilled labour, can be imported more cheaply. Both immigration and trade are seen as a threat to the unskilled. Two dimensions of this threat are examined in this chapter—the impact of Chinese exports on wages in the US and the impact of immigration on the UK economy.

The Problem of Income Inequality

2019 ◽  
pp. 42-44
Author(s):  
Andrew Smithers
Keyword(s):  
Income Inequality ◽  
Gini Coefficient ◽  
Living Standards ◽  
Living Standard ◽  
The Gini Coefficient ◽  
The Us ◽  
The Uk ◽  
Distribution Of Income

Living standards change in line with GDP per head only if the distribution of incomes is unchanged. If incomes become less equally distributed the living standards of most people will fall even if GDP per head is stable. The Gini Coefficient is the most widely used indicator designed to measure the distribution of income. UK inequality, on this measure, has risen since 1977, stabilized since 1987, and fallen in recent years. In the US there has been a long-term increase in income inequality. Unless this US trend for increased income inequality halts, it is quite likely that even if GDP per head rises in the US, the living standard of the average voter will fall. The recent data suggest that changes in income inequality pose less of a threat to living standards in the UK then they do to those in the US.

Role of energy consumption, cutting tool and workpiece materials towards environmentally conscious machining: A comprehensive review

2019 ◽  
Vol 234 (3) ◽  
pp. 335-354 ◽  
Author(s):  
Salman Pervaiz ◽  
Sathish Kannan ◽  
Ibrahim Deiab ◽  
Hossam Kishawy
Keyword(s):  
Energy Consumption ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Cutting Process ◽  
Machining Process ◽  
Workpiece Material ◽  
Tool Materials ◽  
Wide Range ◽  
Cutting Operation

Metal-cutting process deals with the removal of material using the shearing operation with the help of hard cutting tools. Machining operations are famous in the manufacturing sector due to their capability to manufacture tight tolerances and high dimensional accuracy while simultaneously maintaining the cost-effectiveness for higher production levels. As metal-cutting processes consume a great amount of input resources and generate some material-based waste streams, these processes are highly criticized due to their high and negative environmental impacts. Researchers in the metal-cutting sector are currently exploring and benchmarking different activities and best practices to make the cutting operation environment friendly in nature. These eco-friendly practices mainly cover the wide range of activities directly or indirectly associated with the metal-cutting operation. Most of the literature for sustainable metal-cutting activities revolves around the sustainable lubrication techniques to minimize the negative influence of cutting fluids on the environment. However, there is a need to enlarge the assessment domain for the metal-cutting process and other directly and indirectly associated practices such as enhancing sustainability through innovative methods for workpiece and cutting tool materials, and approaches to optimize energy consumption should also be explored. The aim of this article is to explore the role of energy consumption and the influence of workpiece and tool materials towards the sustainability of machining process. The article concludes that sustainability of the machining process can be improved by incorporating different innovative approaches related to the energy and tool–workpiece material consumptions.

Major Harvey Cushing's difficulties with the British and American armies during World War I

2014 ◽  
Vol 121 (2) ◽  
pp. 319-327 ◽  
Author(s):  
Michael E. Carey
Keyword(s):  
United States ◽  
World War I ◽  
United States Army ◽  
Historical Review ◽  
The United States ◽  
World War ◽  
Us Army ◽  
Hospital Units ◽  
The Us ◽  
Initial Inability

This historical review explores Harvey Cushing's difficulties with both the British and American armies during his World War I service to definitively examine the rumor of his possible court martial. It also provides a further understanding of Cushing the man. While in France during World War I, Cushing was initially assigned to British hospital units. This service began in May 1917 and ended abruptly in May 1918 when the British cashiered him for repeated censorship violations. Returning to American command, he feared court martial. The army file on this matter (retrieved from the United States National Archives) indicates that US Army authorities recommended that Cushing be reprimanded and returned to the US for his violations. The army carried out neither recommendation, and no evidence exists that a court martial was considered. Cushing's army career and possible future academic life were protected by the actions of his surgical peers and Merritte Ireland, Chief Surgeon of the US Army in France. After this censorship episode, Cushing was made a neurosurgical consultant but was also sternly warned that further rule violations would not be tolerated by the US Army. Thereafter, despite the onset of a severe peripheral neuropathy, probably Guillian Barré's syndrome, Cushing was indefatigable in ministering to neurosurgical needs in the US sector in France. Cushing's repeated defying of censorship regulations reveals poor judgment plus an initial inability to be a “team player.” The explanations he offered for his censorship violations showed an ability to bend the truth. Cushing's war journal is unclear as to exactly what transpired between him and the British and US armies. It also shows no recognition of the help he received from others who were instrumental in preventing his ignominious removal from service in France. Had that happened, his academic future and ability to train future neurosurgical leaders may have been seriously threatened. Cushing's foibles notwithstanding, all realized that he contributed greatly to both British and US war neurosurgery. United States Army surgeons who operated upon brain wounds in France recognized Cushing as their leader.

scholarly journals Influence of machining conditions on friction in metal cutting process – A review

Mechanik ◽  
2019 ◽  
Vol 92 (4) ◽  
pp. 242-248
Author(s):  
Wit Grzesik ◽  
Joel Rech
Keyword(s):  
Tool Wear ◽  
Contact Zone ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Sliding Velocity ◽  
Contact Conditions ◽  
Tool Materials ◽  
Cutting Zone ◽  
Cooling Media ◽  
Cutting Tool Materials

This paper presents a range of variable machining factors which influence substantially friction directly or by the tool wear developed in the cutting zone. The group of direct factors include the workpiece and cutting tool materials coupled, the cutting/sliding velocity, cooling media supplied to the tool-chip contact zone, modification of the tool contact faces by micro-texturing. Special attention was paid to the tool wear evolution and its pronounced effect on changes of the contact conditions.

Modification and Testing of Advanced Hydraulic Cutting Tools for Use in an Arctic Environment

2001 ◽  
Author(s):  
R. Jon Stouky ◽  
Andrew R. Griffith ◽  
Barry J. Spargo ◽  
Michael R. Walsh ◽  
Paul H. Krumrine ◽  
...  
Keyword(s):  
Metal Cutting ◽  
Cutting Tools ◽  
Volume Reduction ◽  
Metal Scrap ◽  
Cold Regions ◽  
Arctic Environment ◽  
The Us ◽  
Arctic Conditions

Abstract An assessment was performed of Russian needs and capabilities related to decommissioning wastes from nuclear submarines. Hydraulically operated hand-held metal cutting tools can provide improved productivity and safety during the size and volume reduction of bulky metal scrap. Such tools are commercially available in the US, but not in Russia. Also, they have not been previously deployed in Arctic conditions. A system of metal cutting and spreading tools has been procured, modified and successfully tested at the Cold Regions Research and Engineering Laboratory (CRREL), and are now being deployed to Russia’s Northern Fleet.

scholarly journals A Historical Review of Management Options Used against the Stable Fly (Diptera: Muscidae)

Insects ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 313
Author(s):  
David Cook
Keyword(s):  
Negative Impact ◽  
Control Strategies ◽  
Historical Review ◽  
Stable Fly ◽  
Management Options ◽  
Stable Flies ◽  
Arthropod Predators ◽  
The Us ◽  
Physical Barriers ◽  
Production Losses

The stable fly, Stomoxys calcitrans (L.) (Diptera: Muscidae), remains a significant economic pest globally in situations where intensive animal production or horticultural production provide a suitable developmental medium. Stable flies have been recorded as pests of livestock and humans since the late 1800s to early 1900s. Over 100 years of research has seen numerous methodologies used to control this fly, in particular to protect cattle from flies to minimise production losses. Reduced milk production in dairy cows and decreased weight gain in beef cattle account for losses in the US alone of > $2000 million annually. Rural lifestyles and recreation are also seriously affected. Progress has been made on many control strategies against stable fly over a range of chemical, biological, physical and cultural options. This paper reviews management options from both a historical and a technical perspective for controlling this pest. These include the use of different classes of insecticides applied to affected animals as toxicants or repellents (livestock and humans), as well as to substrates where stable fly larvae develop. Arthropod predators of stable flies are listed, from which potential biological control agents (e.g., wasps, mites, and beetles) are identified. Biopesticides (e.g., fungi, bacteria and plant-derived products) are also discussed along with Integrated Pest Management (IPM) against stable flies for several animal industries. A review of cultural and physical management options including trapping, trap types and methodologies, farm hygiene, scheduled sanitation, physical barriers to fly emergence, livestock protection and amendments added to animal manures and bedding are covered. This paper presents a comprehensive review of all management options used against stable flies from both a historical and a technical perspective for use by any entomologist, livestock producer or horticulturalist with an interest in reducing the negative impact of this pest fly.

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