Turning is a machining process in which a cutting tool , typically a non-rotary tool bit , describes a helix toolpath by moving more or less linearly while the workpiece rotates .
86-414: Usually the term "turning" is reserved for the generation of external surfaces by this cutting action, whereas this same essential cutting action when applied to internal surfaces (holes, of one kind or another) is called " boring ". Thus the phrase "turning and boring" categorizes the larger family of processes known as lathing. The cutting of faces on the workpiece, whether with a turning or boring tool,
172-403: A 30% increase in output simply from changing over to electric motors. Electrification enabled modern mass production, as with Thomas Edison's iron ore processing plant (about 1893) that could process 20,000 tons of ore per day with two shifts, each of five men. At that time it was still common to handle bulk materials with shovels, wheelbarrows and small narrow-gauge rail cars, and for comparison,
258-637: A backbone "main" assembly line. A diagram of a typical mass-production factory looks more like the skeleton of a fish than a single line. Vertical integration is a business practice that involves gaining complete control over a product's production, from raw materials to final assembly. In the age of mass production, this caused shipping and trade problems in that shipping systems were unable to transport huge volumes of finished automobiles (in Henry Ford's case) without causing damage, and also government policies imposed trade barriers on finished units. Ford built
344-565: A canal digger in previous decades typically handled five tons per 12-hour day. The biggest impact of early mass production was in manufacturing everyday items, such as at the Ball Brothers Glass Manufacturing Company , which electrified its mason jar plant in Muncie, Indiana , U.S., around 1900. The new automated process used glass-blowing machines to replace 210 craftsman glass blowers and helpers. A small electric truck
430-403: A company to produce a larger quantity of one product at a lower cost than using traditional, non-linear methods. However, mass production is inflexible because it is difficult to alter a design or production process after a production line is implemented. Also, all products produced on one production line will be identical or very similar, and introducing variety to satisfy individual tastes
516-528: A couple of hours, were highly successful: over 100,000 Nissen huts were produced during World War I alone, and they would go on to serve in other conflicts and inspire a number of similar designs. Following World War II, in the United States, William Levitt pioneered the building of standardized tract houses in 56 different locations around the country. These communities were dubbed Levittowns , and they were able to be constructed quickly and cheaply through
602-488: A lathe that can be adapted to many operations and that is not too large to be moved from one work site to another. The engine lathe is ideally suited for this purpose. A trained operator can accomplish more machining jobs with the engine lathe than with any other machine tool. Turret lathes and special purpose lathes are usually used in production or job shops for mass production or specialized parts, while basic engine lathes are usually used for any type of lathe work. Over
688-421: A lathe while larger workpieces are machined on boring mills. Workpieces are commonly 1 to 4 metres (3 ft 3 in to 13 ft 1 in) in diameter, but can be as large as 20 m (66 ft). Power requirements can be as much as 200 horsepower (150 kW). Cooling of the bores is done through a hollow passageway through the boring bar where coolant can flow freely. Tungsten-alloy disks are sealed in
774-457: A multiple head milling machine that could simultaneously machine 15 engine blocks held on a single fixture. All of these machine tools were arranged systematically in the production flow and some had special carriages for rolling heavy items into machining position. Production of the Ford Model T used 32,000 machine tools. The process of prefabrication, wherein parts are created separately from
860-419: A primary function, such as jig borers and boring machines or boring mills , which include vertical boring mills (workpiece rotates around a vertical axis while boring bar/head moves linearly; essentially a vertical lathe) and horizontal boring mills (workpiece sits on a table while the boring bar rotates around a horizontal axis; essentially a specialized horizontal milling machine). The dimensions between
946-508: A spindle cutting machine, which could produce multiple parts at the same time. Terry hired Silas Hoadley and Seth Thomas to work the Assembly line at the facilities. The Porter Contract was the first contract which called for mass production of clock movements in history. In 1815, Terry began mass-producing the first shelf clock. Chauncey Jerome , an apprentice of Eli Terry mass-produced up to 20,000 brass clocks annually in 1840 when he invented
SECTION 10
#17328549627621032-591: A system of process control which uses various instruments to measure variables such as temperature, pressure, volumetric and level, providing feedback. Bulk materials such as coal, ores, grains and wood chips are handled by belt, chain, slat, pneumatic or screw conveyors, bucket elevators and mobile equipment such as front-end loaders . Materials on pallets are handled with forklifts. Also used for handling heavy items like reels of paper, steel or machinery are electric overhead cranes , sometimes called bridge cranes because they span large factory bays. Mass production
1118-420: A taper, the tool may be fed at an angle to the axis of rotation or both feed and axial motions may be concurrent. Straight holes and counterbores are produced by moving the tool parallel to the axis of workpiece rotation. The four most commonly used workholding devices are the three-jaw chuck, the four-jaw chuck, the collet , and the faceplate . The three-jaw chuck is used to hold round or hex workpieces because
1204-410: A temperature change of a few hundred degrees takes place (no matter how temporary), the workpiece, or a portion of it, is likely to spring into a new shape, even if the movement is extremely small. In some cases a movement of a fraction of a micrometre in one area is amplified in lever fashion to create a positional error of several micrometres for a feature of the workpiece several decimetres away. It
1290-401: A tremendous amount of useless handling and hauling. The belt and line shaft were also tremendously wasteful – so wasteful indeed that no factory could be really large, for even the longest line shaft was small according to modern requirements. Also high speed tools were impossible under the old conditions – neither the pulleys nor the belts could stand modern speeds. Without high speed tools and
1376-526: A turning operation are important in the design of machine tools. The machine tool and its components must be able to withstand these forces without causing significant deflections, vibrations, or chatter during the operation. There are three principal forces during a turning process: Speeds and feeds for turning are chosen based on cutter material, workpiece material, setup rigidity, machine tool rigidity and spindle power, coolant choice, and other factors. Boring (manufacturing) In machining , boring
1462-480: A very large amount of trees. In order to speed up such efforts, fast propagation of trees may be useful. Some automated machines have been produced to allow for fast (vegetative) plant propagation . Also, for some plants that help to sequester carbon (such as seagrass ), techniques have been developed to help speed up the process . Mass production benefited from the development of materials such as inexpensive steel, high strength steel and plastics. Machining of metals
1548-607: A worker work on a whole product from start to finish. The emergence of mass production allowed supply to outstrip demand in many markets, forcing companies to seek new ways to become more competitive . Mass production ties into the idea of overconsumption and the idea that we as humans consume too much. Mass production of fluid matter typically involves piping with centrifugal pumps or screw conveyors (augers) to transfer raw materials or partially complete products between vessels. Fluid flow processes such as oil refining and bulk materials such as wood chips and pulp are automated using
1634-450: A “Turned Part” or “Machined Component”. Turning operations are carried out on a lathe machine which can be manually or CNC operated. Turning specific operations include: The general process of turning involves rotating a part while a single-point cutting tool is moved parallel to the axis of rotation. Turning can be done on the external surface of the part as well as the internal surface (the process known as boring ). The starting material
1720-640: Is Jikji , printed in Korea in the year 1377. Johannes Gutenberg , through his invention of the printing press and production of the Gutenberg Bible , introduced movable type to Europe. Through this introduction, mass production in the European publishing industry was made commonplace, leading to a democratization of knowledge , increased literacy and education, and the beginnings of modern science . French artillery engineer Jean-Baptiste de Gribeauval introduced
1806-405: Is capital-intensive and energy-intensive, for it uses a high proportion of machinery and energy in relation to workers. It is also usually automated while total expenditure per unit of product is decreased. However, the machinery that is needed to set up a mass production line (such as robots and machine presses ) is so expensive that in order to attain profits there must be some assurance that
SECTION 20
#17328549627621892-448: Is a reduction of non-productive effort of all types. In craft production , the craftsman must bustle about a shop, getting parts and assembling them. He must locate and use many tools many times for varying tasks. In mass production, each worker repeats one or a few related tasks that use the same tool to perform identical or near-identical operations on a stream of products. The exact tool and parts are always at hand, having been moved down
1978-465: Is a typical follow-up operation. Often a part will be roughed and semifinished in the machining operation, then heat treated , and finally, finished by internal cylindrical grinding. The limitations of boring in terms of its geometric accuracy (form, position) and the hardness of the workpiece have been shrinking in recent decades as machining technology continues to advance. For example, new grades of carbide and ceramic cutting inserts have increased
2064-466: Is also used for irregular shapes. Collets combine self-centering chucking with low runout, but they involve higher costs. For most lathe boring applications, tolerances greater than ±0.010 in (±0.25 mm) are easily held. Tolerances from there down to ±0.005 in (±0.13 mm) are usually held without especial difficulty or expense, even in deep holes. Tolerances between ±0.004 in (±0.10 mm) and ±0.001 in (±0.025 mm) are where
2150-446: Is called "facing", and may be lumped into either category as a subset. Turning can be done manually, in a traditional form of lathe , which frequently requires continuous supervision by the operator, or by using an automated lathe which does not. Today the most common type of such automation is computer numerical control , better known as CNC. (CNC is also commonly used with many other types of machining besides turning.) When turning,
2236-472: Is expensive, with 100% inspection and loss of nonconforming parts adding to the cost. Grinding, honing, and lapping are the recourse for when the limits of boring repeatability and accuracy have been met. Surface finish ( roughness ) in boring may range from 8 to 250 microinches, with a typical range between 32 and 125 microinches. Sometimes a part may require higher accuracy of form and size than can be provided by boring. For example, even in optimized boring,
2322-484: Is factors such as these that sometimes preclude finishing by boring and turning as opposed to internal and external cylindrical grinding. At the extreme, no perfection of machining or grinding may be enough when, despite the part being within tolerance when it is made, it warps out of tolerance in following days or months. When engineers are confronted with such a case, it drives the quest to find other workpiece materials, or alternate designs that avoid relying so heavily on
2408-429: Is generally a workpiece generated by other processes such as casting , forging , extrusion , or drawing . Facing in the context of turning work involves moving the cutting tool at right angles to the axis of rotation of the rotating workpiece. This can be performed by the operation of the cross-slide, if one is fitted, as distinct from the longitudinal feed (turning). It is frequently the first operation performed in
2494-827: Is one of the three main production methods. The term mass production was popularized by a 1926 article in the Encyclopædia Britannica supplement that was written based on correspondence with Ford Motor Company . The New York Times used the term in the title of an article that appeared before the publication of the Britannica article. The idea of mass production is applied to many kinds of products: from fluids and particulates handled in bulk ( food , fuel , chemicals and mined minerals ), to clothing, textiles, parts and assemblies of parts ( household appliances and automobiles ). Some mass production techniques, such as standardized sizes and production lines, predate
2580-517: Is that while Taylor focused mostly on efficiency of the worker, Ford also substituted for labor by using machines, thoughtfully arranged, wherever possible. In 1807, Eli Terry was hired to produce 4,000 wooden movement clocks in the Porter Contract. At this time, the annual yield for wooden clocks did not exceed a few dozen on average. Terry developed a milling machine in 1795, in which he perfected Interchangeable parts . In 1807, Terry developed
2666-548: Is the process of enlarging a hole that has already been drilled (or cast ) by means of a single-point cutting tool (or of a boring head containing several such tools), such as in boring a gun barrel or an engine cylinder . Boring is used to achieve greater accuracy of the diameter of a hole, and can be used to cut a tapered hole. Boring can be viewed as the internal-diameter counterpart to turning , which cuts external diameters. There are various types of boring. The boring bar may be supported on both ends (which only works if
Turning - Misplaced Pages Continue
2752-610: The Ford River Rouge Complex with the idea of making the company's own iron and steel in the same large factory site where parts and car assembly took place. River Rouge also generated its own electricity. Upstream vertical integration, such as to raw materials, is away from leading technology toward mature, low-return industries. Most companies chose to focus on their core business rather than vertical integration. This included buying parts from outside suppliers, who could often produce them as cheaply or cheaper. Standard Oil ,
2838-546: The Henry Ford Company which was rebranded as Cadillac and later was awarded the Dewar Trophy in 1908 for creating interchangeable mass-produced precision engine parts, Henry Ford downplayed the role of Taylorism in the development of mass production at his company. However, Ford management performed time studies and experiments to mechanize their factory processes, focusing on minimizing worker movements. The difference
2924-508: The Industrial Revolution by many centuries; however, it was not until the introduction of machine tools and techniques to produce interchangeable parts were developed in the mid-19th century that modern mass production was possible. Mass production involves making many copies of products, very quickly, using assembly line techniques to send partially complete products to workers who each work on an individual step, rather than having
3010-636: The Portsmouth Block Mills in England to make ships' pulley blocks for the Royal Navy in the Napoleonic Wars . It was achieved in 1803 by Marc Isambard Brunel in cooperation with Henry Maudslay under the management of Sir Samuel Bentham . The first unmistakable examples of manufacturing operations carefully designed to reduce production costs by specialized labour and the use of machines appeared in
3096-627: The Venetian Arsenal produced nearly one ship every day in what was effectively the world's first factory , which at its height employed 16,000 people. The invention of movable type has allowed for documents such as books to be mass produced. The first movable type system was invented in China by Bi Sheng , during the reign of the Song dynasty , where it was used to, among other things, issue paper money . The oldest extant book produced using metal type
3182-658: The platonic solids ; although since the advent of CNC it has become unusual to use non-computerized toolpath control for this purpose. The turning processes are typically carried out on a lathe, considered to be the oldest of machine tools, and can be of different types such as straight turning , taper turning , profiling or external grooving . Those types of turning processes can produce various shapes of materials such as straight , conical , curved , or grooved workpieces. In general, turning uses simple single-point cutting tools. Each group of workpiece materials has an optimum set of tool angles that have been developed through
3268-459: The workpiece (a piece of relatively rigid material such as wood, metal, plastic, or stone) is rotated and a cutting tool is traversed along 1, 2, or 3 axes of motion to produce precise diameters and depths. Turning can be either on the outside of the cylinder or on the inside (also known as boring ) to produce tubular components to various geometries. Although now quite rare, early lathes could even be used to produce complex geometric figures, even
3354-480: The 18th century in England. The Navy was in a state of expansion that required 100,000 pulley blocks to be manufactured a year. Bentham had already achieved remarkable efficiency at the docks by introducing power-driven machinery and reorganising the dockyard system. Brunel, a pioneering engineer, and Maudslay, a pioneer of machine tool technology who had developed the first industrially practical screw-cutting lathe in 1800 which standardized screw thread sizes for
3440-452: The 20th century's definition of mass production appeared in a 1926 Encyclopædia Britannica supplement. The article was written based on correspondence with Ford Motor Company and is sometimes credited as the first use of the term. Electrification of factories began very gradually in the 1890s after the introduction of a practical DC motor by Frank J. Sprague and accelerated after the AC motor
3526-584: The Emperor's tomb is also believed to have been created through the use of standardized molds on an assembly line . In ancient Carthage , ships of war were mass-produced on a large scale at a moderate cost, allowing them to efficiently maintain their control of the Mediterranean . Many centuries later, the Republic of Venice would follow Carthage in producing ships with prefabricated parts on an assembly line:
Turning - Misplaced Pages Continue
3612-413: The accuracy and surface quality that can be achieved without grinding, and have increased the range of workpiece hardness values that are workable. However, working to tolerances of only a few micrometres (a few tenths) forces the manufacturing process to rationally confront, and compensate for, the fact that no actual workpiece is ideally rigid and immobile. Each time a cut is taken (no matter how small), or
3698-430: The amount that the diameter varies on different portions of the bore is seldom less than 3 micrometre (.0001 inches, "a tenth"), and it may easily be 5 to 20 micrometre (.0002-.0008 inches, "2 to 8 tenths"). Taper, roundness error, and cylindricity error of such a hole, although they would be considered negligible in most other parts, may be unacceptable for a few applications. For such parts, internal cylindrical grinding
3784-471: The armories designing and building many of their own. Some of the methods employed were a system of gauges for checking dimensions of the various parts and jigs and fixtures for guiding the machine tools and properly holding and aligning the work pieces. This system came to be known as armory practice or the American system of manufacturing , which spread throughout New England aided by skilled mechanics from
3870-894: The armories who were instrumental in transferring the technology to the sewing machines manufacturers and other industries such as machine tools, harvesting machines and bicycles. Singer Manufacturing Co. , at one time the largest sewing machine manufacturer, did not achieve interchangeable parts until the late 1880s, around the same time Cyrus McCormick adopted modern manufacturing practices in making harvesting machines . During World War II , The United States mass-produced many vehicles and weapons , such as ships (i.e. Liberty Ships , Higgins boats ), aircraft (i.e. North American P-51 Mustang , Consolidated B-24 Liberator , Boeing B-29 Superfortress ), jeeps (i.e. Willys MB ), trucks, tanks (i.e. M4 Sherman ) and M2 Browning and M1919 Browning machine guns . Many vehicles, transported by ships have been shipped in parts and later assembled on-site. For
3956-504: The assembly line consecutively. The worker spends little or no time retrieving and/or preparing materials and tools, and so the time taken to manufacture a product using mass production is shorter than when using traditional methods. The probability of human error and variation is also reduced, as tasks are predominantly carried out by machinery; error in operating such machinery has more far-reaching consequences. A reduction in labour costs, as well as an increased rate of production, enables
4042-441: The bar to counteract vibration and chatter during boring. The control systems can be computer-based, allowing for automation and increased consistency. Because boring is meant to decrease the product tolerances on pre-existing holes, several design considerations apply. First, large length-to-bore-diameters are not preferred due to cutting tool deflection. Next, through holes are preferred over blind holes (holes that do not traverse
4128-429: The blocks to ensure alignment throughout the process. One of the many advantages of this new method was the increase in labour productivity due to the less labour-intensive requirements of managing the machinery. Richard Beamish, assistant to Brunel's son and engineer, Isambard Kingdom Brunel , wrote: So that ten men, by the aid of this machinery, can accomplish with uniformity, celerity and ease, what formerly required
4214-708: The challenge begins rising. In deep holes with tolerances this tight, the limiting factor is just as often the geometric constraint as the size constraint. In other words, it may be easy to hold the diameter within .002" at any diametrical measurement point, but difficult to hold the cylindricity of the hole to within a zone delimited by the .002" constraint, across more than 5 diameters of hole depth (depth measured in terms of diameter:depth aspect ratio ). For highest-precision applications, tolerances can generally be held within ±0.0005 in (±0.013 mm) only for shallow holes. In some cases tolerances as tight as ±0.0001 in (±0.0038 mm) can be held in shallow holes, but it
4300-407: The cheap 30-hour OG clock. The United States Department of War sponsored the development of interchangeable parts for guns produced at the arsenals at Springfield, Massachusetts and Harpers Ferry , Virginia (now West Virginia) in the early decades of the 19th century, finally achieving reliable interchangeability by about 1850. This period coincided with the development of machine tools , with
4386-424: The cutting tool moves parallel to the axis of rotation. For tapered holes, the cutting tool moves at an angle to the axis of rotation. Geometries ranging from simple to extremely complex in a variety of diameters can be produced using boring applications. Boring is one of the most basic lathe operations next to turning and drilling. Lathe boring usually requires that the workpiece be held in the chuck and rotated. As
SECTION 50
#17328549627624472-438: The existing hole is a through hole), or it may be supported at one end (which works for both, through holes and blind holes ). Lineboring (line boring, line-boring) implies the former. Backboring (back boring, back-boring) is the process of reaching through an existing hole and then boring on the "back" side of the workpiece (relative to the machine headstock). Because of the limitations on tooling design imposed by
4558-638: The face of the part (face grooving or trepanning). Non-specific operations include: A lathe is a machine tool used principally for shaping pieces of metal, wood, or other materials by causing the workpiece to be held and rotated by the lathe while a tool bit is advanced into the work causing the cutting action. Lathes can be divided into three types for easy identification: engine lathe , turret lathe , and special purpose lathes . Some smaller ones are bench mounted and semi-portable. The larger lathes are floor mounted and may require special transportation if they must be moved. Field and maintenance shops generally use
4644-546: The fact that the workpiece mostly surrounds the tool, boring is inherently somewhat more challenging than turning, in terms of decreased toolholding rigidity, increased clearance angle requirements (limiting the amount of support that can be given to the cutting edge), and difficulty of inspection of the resulting surface (size, form, surface roughness ). These are the reasons why boring is viewed as an area of machining practice in its own right, separate from turning, with its own tips, tricks, challenges, and body of expertise, despite
4730-571: The fact that they are in some ways identical. The first boring machine tool was invented by John Wilkinson in 1775. Boring and turning have abrasive counterparts in internal and external cylindrical grinding . Each process is chosen based on the requirements and parameter values of a particular application. The boring process can be executed on various machine tools , including (1) general-purpose or universal machines, such as lathes (/turning centers) or milling machines (/machining centers), and (2) machines designed to specialize in boring as
4816-456: The fashion industry, particularly in the realm of fibers and materials. The advent of synthetic fibers, such as polyester and nylon, revolutionized textile manufacturing by providing cost-effective alternatives to natural fibers. This shift enabled the rapid production of inexpensive clothing, contributing to the rise of fast fashion. This reliance on mass production has raised concerns about environmental sustainability and labor conditions, spurring
4902-502: The finer steels which they brought about, there could be nothing of what we call modern industry. Mass production was popularized in the late 1910s and 1920s by Henry Ford's Ford Motor Company , which introduced electric motors to the then-well-known technique of chain or sequential production. Ford also bought or designed and built special purpose machine tools and fixtures such as multiple spindle drill presses that could drill every hole on one side of an engine block in one operation and
4988-550: The finished product, is at the core of all mass-produced construction. Early examples include movable structures reportedly utilized by Akbar the Great , and the chattel houses built by emancipated slaves on Barbados . The Nissen hut , first used by the British during World War I , married prefabrication and mass production in a way that suited the needs of the military. The simple structures, which cost little and could be erected in just
5074-471: The first instance of the application of mass production techniques (though not necessarily the assembly-line method) to marine engineering. In filling an Admiralty order for 90 sets to his high-pressure and high-revolution horizontal trunk engine design, Penn produced them all in 90 days. He also used Whitworth Standard threads throughout. Prerequisites for the wide use of mass production were interchangeable parts , machine tools and power , especially in
5160-594: The first time which in turn allowed the application of interchangeable parts , collaborated on plans to manufacture block-making machinery. By 1805, the dockyard had been fully updated with the revolutionary, purpose-built machinery at a time when products were still built individually with different components. A total of 45 machines were required to perform 22 processes on the blocks, which could be made into one of three possible sizes. The machines were almost entirely made of metal thus improving their accuracy and durability. The machines would make markings and indentations on
5246-475: The form of electricity . Some of the organizational management concepts needed to create 20th-century mass production, such as scientific management , had been pioneered by other engineers (most of whom are not famous, but Frederick Winslow Taylor is one of the well-known ones), whose work would later be synthesized into fields such as industrial engineering , manufacturing engineering , operations research , and management consultancy . Although after leaving
SECTION 60
#17328549627625332-405: The immobility of part features on the micro or nano scales. Mass production Mass production , also known as flow production , series production , series manufacture , or continuous production , is the production of substantial amounts of standardized products in a constant flow, including and especially on assembly lines . Together with job production and batch production , it
5418-415: The initial position, and so on. These are called using G-codes such as G76, G85, G86, G87, G88, G89; and also by other less common codes specific to particular control builders or machine tool builders. Lathe boring is a cutting operation that uses a single-point cutting tool or a boring head to produce conical or cylindrical surfaces by enlarging an existing opening in a workpiece. For nontapered holes,
5504-536: The invention of machine tools the manufacture of precision parts, especially metal ones, was highly labour-intensive. Crossbows made with bronze parts were produced in China during the Warring States period . The Qin Emperor unified China at least in part by equipping large armies with these weapons, which were fitted with a sophisticated trigger mechanism made of interchangeable parts. The Terracotta Army guarding
5590-423: The leather belt and line shaft , for it eventually became possible to provide each tool with its own electric motor. This may seem only a detail of minor importance. In fact, modern industry could not be carried out with the belt and line shaft for a number of reasons. The motor enabled machinery to be arranged in the order of the work, and that alone has probably doubled the efficiency of industry, for it has cut out
5676-455: The leveraging of economies of scale , as well as the specialization of construction tasks in a process akin to an assembly line. This era also saw the invention of the mobile home , a small prefabricated house that can be transported cheaply on a truck bed. In the modern industrialization of construction, mass production is often used for prefabrication of house components. Fabrics and Materials Mass production has significantly impacted
5762-793: The major oil company in the 19th century, was vertically integrated partly because there was no demand for unrefined crude oil, but kerosene and some other products were in great demand. The other reason was that Standard Oil monopolized the oil industry. The major oil companies were, and many still are, vertically integrated, from production to refining and with their own retail stations, although some sold off their retail operations. Some oil companies also have chemical divisions. Lumber and paper companies at one time owned most of their timber lands and sold some finished products such as corrugated boxes. The tendency has been to divest of timber lands to raise cash and to avoid property taxes. The economies of mass production come from several sources. The primary cause
5848-457: The need for greater ethical and sustainable practices within the fashion industry. Mass production systems for items made of numerous parts are usually organized into assembly lines . The assemblies pass by on a conveyor, or if they are heavy, hung from an overhead crane or monorail. In a factory for a complex product, rather than one assembly line, there may be many auxiliary assembly lines feeding sub-assemblies (i.e. car engines or seats) to
5934-505: The ongoing energy transition , many wind turbine components and solar panels are being mass-produced. Wind turbines and solar panels are being used in respectively wind farms and solar farms . In addition, in the ongoing climate change mitigation , large-scale carbon sequestration (through reforestation , blue carbon restoration , etc) has been proposed. Some projects (such as the Trillion Tree Campaign ) involve planting
6020-467: The piece and the tool bit can be changed about two axes to cut both vertically and horizontally into the internal surface. The cutting tool is usually single point, made of M2 and M3 high-speed steel or P10 and P01 carbide . A tapered hole can be made by simultaneously feeding the cutting edge in both the radial and axial directions. Boring machines come in a large variety of sizes and styles. Boring operations on small workpieces can be carried out on
6106-479: The product against the plans or the other parts as it is being formed, there were jigs ready at hand to ensure that the part was made to fit this set-up. It had already been checked that the finished part would be to specifications to fit all the other finished parts—and it would be made more quickly, with no time spent on finishing the parts to fit one another. Later, once computerized control came about (for example, CNC ), jigs were obviated, but it remained true that
6192-421: The product will be successful. One of the descriptions of mass production is that "the skill is built into the tool", which means that the worker using the tool may not need the skill. For example, in the 19th or early 20th century, this could be expressed as "the craftsmanship is in the workbench itself" (not the training of the worker). Rather than having a skilled worker measure every dimension of each part of
6278-471: The production of the workpiece, and often the last—hence the phrase "ending up". This process, also called parting off or cutoff , is used to create deep grooves which will remove a completed or part-complete component from its parent stock. Grooving is like parting, except that grooves are cut to a specific depth instead of severing a completed/part-complete component from the stock. Grooving can be performed on internal and external surfaces, as well as on
6364-446: The resulting surface of a workpiece in machining operations. Different types of angle such as rake angle , side rake angle , cutting-edge angle , relief angle , nose radius exist and may be different with respect to the workpiece. Also, there are many shapes of single-point cutting tools, such as V-shaped and Square. Usually, a special toolholder is used to hold the cutting tool firmly during operation. The relative forces in
6450-418: The skill (or knowledge) was built into the tool (or process, or documentation) rather than residing in the worker's head. This is the specialized capital required for mass production; each workbench and set of tools (or each CNC cell, or each fractionating column ) is different (fine-tuned to its task). Standardized parts and sizes and factory production techniques were developed in pre-industrial times; before
6536-444: The standardization of cannon design in the late 18th century. He streamlined production and management of cannonballs and cannons by limiting them to only three calibers, and he improved their effectiveness by requiring more spherical ammunition. Redesigning these weapons to use interchangeable wheels, screws, and axles simplified mass production and repair. In the Industrial Revolution , simple mass production techniques were used at
6622-742: The thickness of the work piece). Interrupted internal working surfaces—where the cutting tool and surface have discontinuous contact—are preferably avoided. The boring bar is the protruding arm of the machine that holds the cutting tool(s), and must be very rigid. Because of the factors just mentioned, deep-hole drilling and deep-hole boring are inherently challenging areas of practice that demand special tooling and techniques. Nevertheless, technologies have been developed that produce deep holes with impressive accuracy. In most cases they involve multiple cutting points, diametrically opposed, whose deflection forces cancel each other out. They also usually involve delivery of cutting fluid pumped under pressure through
6708-507: The tool to orifices near the cutting edges. Gun drilling and cannon boring are classic examples. First developed to make the barrels of firearms and artillery, these machining techniques find wide use today for manufacturing in many industries. Various fixed cycles for boring are available in CNC controls. These are preprogrammed subroutines that move the tool through successive passes of cut, retract, advance, cut again, retract again, return to
6794-513: The uncertain labour of one hundred and ten. By 1808, annual production from the 45 machines had reached 130,000 blocks and some of the equipment was still in operation as late as the mid-twentieth century. Mass production techniques were also used to rather limited extent to make clocks and watches, and to make small arms, though parts were usually non-interchangeable. Though produced on a very small scale, Crimean War gunboat engines designed and assembled by John Penn of Greenwich are recorded as
6880-473: The work is automatically centered. On these chucks the runout faces limitations; on late-model CNCs, it can be quite low if all conditions are excellent, but traditionally it is usually at least .001-.003 in (0.025-0.075 mm). The four-jaw chuck is used either to hold irregular shapes or to hold round or hex to extremely low runout (with time spent indicating and clamping each piece), in both cases because of its independent action on each jaw. The face plate
6966-504: The workpiece is rotated, a boring bar with an insert attached to the tip of the bar is fed into an existing hole. When the cutting tool engages the workpiece, a chip is formed. Depending on the type of tool used, the material, and the feed rate, the chip may be continuous or segmented. The surface produced is called a bore. The geometry produced by lathe boring is usually of two types: straight holes and tapered holes. Several diameters can also be added to each shape hole if required. To produce
7052-430: The years, in the manufacturing industry, with the improvement of the difficulty of product processing, the emergence of CNC turning milling compound centers, which maintains the characteristics of lathe machining, but also increased the function of the milling machine , the combination of the two to improve production efficiency. The various angles, shapes, and sizes of a single-point cutting tool have direct relation to
7138-415: The years. The bits of waste metal from turning operations are known as chips (North America), or swarf (Britain). In some areas they may be known as turnings . The tool's axes of movement may be literally a straight line, or they may be along some set of curves or angles, but they are essentially linear (in the non mathematical sense). A component that is subject to turning operations can be termed as
7224-667: Was developed by Galileo Ferraris , Nikola Tesla and Westinghouse , Mikhail Dolivo-Dobrovolsky and others. Electrification of factories was fastest between 1900 and 1930, aided by the establishment of electric utilities with central stations and the lowering of electricity prices from 1914 to 1917. Electric motors were several times more efficient than small steam engines because central station generation were more efficient than small steam engines and because line shafts and belts had high friction losses. Electric motors also allowed more flexibility in manufacturing and required less maintenance than line shafts and belts. Many factories saw
7310-605: Was greatly enhanced with high-speed steel and later very hard materials such as tungsten carbide for cutting edges. Fabrication using steel components was aided by the development of electric welding and stamped steel parts, both which appeared in industry in about 1890. Plastics such as polyethylene , polystyrene and polyvinyl chloride (PVC) can be easily formed into shapes by extrusion , blow molding or injection molding , resulting in very low cost manufacture of consumer products, plastic piping, containers and parts. An influential article that helped to frame and popularize
7396-430: Was used to handle 150 dozen bottles at a time where previously a hand truck would carry six dozen. Electric mixers replaced men with shovels handling sand and other ingredients that were fed into the glass furnace. An electric overhead crane replaced 36 day laborers for moving heavy loads across the factory. According to Henry Ford : The provision of a whole new system of electric generation emancipated industry from
#761238