A millwright is a craftsman or skilled tradesman who installs, dismantles, maintains, repairs, reassembles, and moves machinery in factories, power plants, and construction sites.
Trapezoidal thread forms are screw thread profiles with trapezoidal outlines. They are the most common forms used for leadscrews. They offer high strength and ease of manufacture. They are typically found where large loads are required, as in a vise or the leadscrew of a lathe. Standardized variations include multiple-start threads, left-hand threads, and self-centering threads.
A machine shop or engineering workshop is a room, building, or company where machining, a form of subtractive manufacturing, is done. In a machine shop, machinists use machine tools and cutting tools to make parts, usually of metal or plastic. A machine shop can be a small business or a portion of a factory, whether a toolroom or a production area for manufacturing. The building construction and the layout of the place and equipment vary, and are specific to the shop; for instance, the flooring in one shop may be concrete, or even compacted dirt, and another shop may have asphalt floors. A shop may be air-conditioned or not; but in other shops it may be necessary to maintain a controlled climate. Each shop has its own tools and machinery which differ from other shops in quantity, capability and focus of expertise.
Leon Pratt Alford was an American mechanical engineer, organizational theorist, and administrator for the American Society of Mechanical Engineers. known for his seminal work in the field of industrial management.
John Alexander Hill was a co-founder of the McGraw-Hill Book Company, the predecessor corporation of today's S&P Global and McGraw-Hill Education.
Fred Herbert Colvin (1867–1965) was an American machinist, technical journalist, author, and editor. He wrote, co-wrote, edited, or co-edited many periodical articles, handbooks, and textbooks related to engineering, machining, and manufacturing. His autobiography, Sixty Years with Men and Machines, provides a thorough and colloquial look into the decades of 1880 to 1950, giving insight into the culture of the Machine Age.
American Machinists' Handbook was a McGraw-Hill reference book similar to Industrial Press's Machinery's Handbook.
Buttress thread forms, also known as sawtooth thread forms or breech-lock thread forms. are screw thread profiles with an asymmetric shape, having one square face and the other slanted. They are most commonly used for leadscrews where the load is principally applied in one direction. The asymmetric thread form allows the thread to have low friction and withstand greater loads than other forms in one direction, but at the cost of higher friction and inferior load bearing in the opposite direction. They are typically easier to manufacture than square thread forms but offer higher load capacity than equivalently sized trapezoidal thread forms.
Marks' Standard Handbook for Mechanical Engineers is a comprehensive handbook for the field of mechanical engineering. Originally based on the even older German Hütte, it was first published in 1916 by Lionel Simeon Marks. In 2017, its 12th edition, published by McGraw-Hill, marked the 100th anniversary of the work. The handbook was translated into several languages.
Terrell Croft (1880–1967) was an American engineer and author of technical books on electrical and mechanical subjects, most or all of which were published by McGraw-Hill. Titles include Wiring of Finished Buildings (1915), Electrical Machinery; Principles, Operations, and Management (1917), and Steam Engine Principles and Practice (1922).
Indexing in reference to motion is moving into a new position or location quickly and easily but also precisely. When indexing a machine part, its new location is known to within a few hundredths of a millimeter, or often even to within a few thousandths of a millimeter, despite the fact that no elaborate measuring or layout was needed to establish that location. In reference to multi-edge cutting inserts, indexing is the process of exposing a new cutting edge for use. Indexing is a necessary kind of motion in many areas of mechanical engineering and machining. An object that indexes, or can be indexed, is said to be indexable.
A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to the head. The most common uses of screws are to hold objects together and there are many forms for a variety of materials. Screws might be inserted into holes in assembled parts or a screw may form its own thread. The difference between a screw and a bolt is that the latter is designed to be tightened or released by torquing a nut.
In mechanical engineering, the thread angle of a screw is the included angle between the thread flanks, measured in a plane containing the thread axis. This is a defining factor for the shape of a screw thread. Standard values include:
The Churchill Machine Tool Company Limited began as the manufacturing subsidiary of the machine tool importers Charles Churchill & Company Limited founded in the early 1900s by US-born Charles Churchill (1837–1916). Created out of the personal bankruptcy of Charles Churchill, the company developed to become one of the largest British importers of machine tools from the United States and a major manufacturer of such tools, initially under licence and later of its own development.
Franklin Day Jones (1879–1967) was an author in mechanical engineering and toolmaking. He wrote the first edition of Machinery's Handbook, with engineer Erik Oberg.
A dwell mechanism is an intermittent motion mechanism that alternates forward and return motion with holding position(s).
John Herbert Van Deventer was an American engineer, inventor, trade journal editor, and writer on engineering, management, and accounting. In the field of accounting Van Deventer contributed to the theory of discounted cash flow. During World War I he served as editor-in-chief of the American Machinist.
Engineering Magazine was an American illustrated monthly magazine devoted to industrial progress, first published in 1891. The periodical was published under this title until October 1916. Sequentially from Nov. 1916 to 1927 it was published as Industrial Management.
The American Machinist is an American trade magazine of the international machinery industries and most especially their machining aspects. Published since 1877, it was a McGraw-Hill title for over a century before becoming a Penton title in 1988. In 2013 it transitioned from combined print/online publication to online-only.
Machinery's Encyclopedia, 1917
"Boiler", Machinery's Encyclopedia, 1917
