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74-424: Turning is a machining process in which a cutting tool describes a helical toolpath by moving within a plane while the workpiece rotates. Turning or The Turning may also refer to: Turning 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)

148-403: A metal lathe or metalworking lathe is a large class of lathes designed for precisely machining relatively hard materials. They were originally designed to machine metals ; however, with the advent of plastics and other materials, and with their inherent versatility, they are used in a wide range of applications, and a broad range of materials. In machining jargon , where the larger context

222-400: A quick change gearbox (H6) or Norton gearbox . These intermediate gears allow the correct ratio and direction to be set for cutting threads or worm gears . Tumbler gears (operated by H5 ) are provided between the spindle and gear train along with a quadrant plate that enables a gear train of the correct ratio and direction to be introduced. This provides a constant relationship between

296-427: A steady rest (also called a steady , a fixed steady , a center rest , or sometimes, confusingly, a center ). It stands stationary from a rigid mounting on the bed, and it supports the workpiece at the rest's center, typically with three contact points 120° apart. A follower rest (also called a follower or a travelling steady ) is similar, but it is mounted to the carriage rather than the bed, which means that as

370-399: A taper to hold drill bits, centers and other tooling . The tailstock can be positioned along the bed and clamped (T6) in position as dictated by the work piece. There is also provision to offset the tailstock (T4) from the spindles axis, this is useful for turning small tapers, and when re-aligning the tailstock to the axis of the bed. The image shows a reduction gear box (T2) between

444-463: A CAD system can actually be manufactured by the machines that the CAD/CAM software support. A combination lathe , often known as a 3-in-1 machine , introduces drilling or milling operations into the design of the lathe. These machines have a milling column rising up above the lathe bed, and they utilize the carriage and topslide as the X and Y axes for the milling column. The 3-in-1 name comes from

518-527: A basic type of lathe that may be considered the archetypical class of metalworking lathe most often used by the general machinist or machining hobbyist. The name bench lathe implies a version of this class small enough to be mounted on a workbench (but still full-featured, and larger than mini-lathes or micro-lathes ). The construction of a center lathe is detailed above, but depending on the year of manufacture, size, price range or desired features, even these lathes can vary widely between models. Engine lathe

592-498: A class of lathes that are used for repetitive production of duplicate parts (which by the nature of their cutting process are usually interchangeable ). It evolved from earlier lathes with the addition of the turret , which is an indexable tool holder that allows multiple cutting operations to be performed, each with a different cutting tool, in easy, rapid succession, with no need for the operator to perform setup tasks in between (such as installing or uninstalling tools) nor to control

666-428: A continuous basis with high accuracy, low cycle time, and very little human intervention. (The latter two points drive down the unit cost per interchangeable part much lower than could be achieved without these machines.) Computer numerical controlled (CNC) lathes are rapidly replacing the older production lathes (multispindle, etc.) due to their ease of set up, operation, repeatability and accuracy. A CNC Turning Lathe

740-421: A guide bushing . The collet sits behind the guide bushing, and the tools sit in front of the guide bushing, holding stationary on the Z axis. To cut lengthwise along the part, the tools will move in and the material itself will move back and forth along the Z axis. This allows all the work to be done on the material near the guide bushing where it is more rigid, making them ideal for working on slender workpieces as

814-408: A lathe is installed, the first step is to level it, which refers to making sure the bed is not twisted or bowed. There is no need to make the machine exactly horizontal, but it must be entirely untwisted to achieve accurate cutting geometry. A precision level is a useful tool for identifying and removing any twist. It is advisable also to use such a level along the bed to detect bending, in the case of

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888-488: 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

962-431: A lathe with more than four mounting points. In both instances the level is used as a comparator rather than an absolute reference. The feedscrew (H8) is a long driveshaft that allows a series of gears to drive the carriage mechanisms. These gears are located in the apron of the carriage. Both the feedscrew and leadscrew (H7) are driven by either the change gears (on the quadrant) or an intermediate gearbox known as

1036-468: 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

1110-424: A pinion along a rack that is mounted along the lathe bed. The leadscrew will be manufactured to either imperial or metric standards and will require a conversion ratio to be introduced to create thread forms from a different family. To accurately convert from one thread form to the other requires a 127-tooth gear, or on lathes not large enough to mount one, an approximation may be used. Multiples of 3 and 7 giving

1184-640: A ratio of 63:1 can be used to cut fairly loose threads. This conversion ratio is often built into the quick change gearboxes . The precise ratio required to convert a lathe with an Imperial (inch) leadscrew to metric (millimeter) threading is 100 / 127 = 0.7874... . The best approximation with the fewest total teeth is very often 37 / 47 = 0.7872... . This transposition gives a constant -0.020 percent error over all customary and model-maker's metric pitches (0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.60, 0.70, 0.75, 0.80, 1.00, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50 and 6.00 mm). In its simplest form

1258-563: A row of tools set up on its cross-slide, which is long and flat and is similar to a milling machine table. The idea is essentially the same as with turret lathes: to set up multiple tools and then easily index between them for each part-cutting cycle. Instead of being rotary like a turret, the indexable tool group is linear. Multispindle lathes have more than one spindle and automated control (whether via cams or CNC). They are production machines specializing in high-volume production. The smaller types are usually called screw machines , while

1332-452: A secondary spindle, or 'sub-spindle', they also incorporate ' live tooling '. Live tools are rotary cutting tools that are powered by a small motor independently of the spindle motor. Live tools increase the intricacy of components that can be manufactured by the Swiss lathe. For instance, automatically producing a part with a hole drilled perpendicular to the main axis (the axis of rotation of

1406-553: 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. Engine lathe In machining ,

1480-451: 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

1554-477: Is a Computer Controlled piece of machinery. It allows basic machining operations such as turning and drilling to be carried out as on a conventional lathe. They are designed to use modern carbide tooling and fully use modern processes. The part may be designed and the tool paths programmed by the CAD/CAM process or manually by the programmer, and the resulting file uploaded to the machine, and once set and trialled

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1628-441: Is a lathe optimized for toolroom work. It is essentially just a top-of-the-line center lathe , with all of the best optional features that may be omitted from less expensive models, such as a collet closer, taper attachment, and others. The bed of a toolroom lathe is generally wider than that of a standard center lathe. There has also been an implication over the years of selective assembly and extra fitting, with every care taken in

1702-494: Is already understood, they are usually simply called lathes , or else referred to by more-specific subtype names ( toolroom lathe , turret lathe , etc.). These rigid machine tools remove material from a rotating workpiece via the (typically linear ) movements of various cutting tools, such as tool bits and drill bits . The design of lathes can vary greatly depending on the intended application; however, basic features are common to most types. These machines consist of (at

1776-454: 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, 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

1850-444: Is fitted with some means of attaching workholding devices such as chucks or faceplates . This end of the spindle usually also has an included taper , frequently a Morse taper , to allow the insertion of hollow tubular (Morse standard) tapers to reduce the size of the tapered hole, and permit use of centers . On older machines ('50s) the spindle was directly driven by a flat belt pulley with lower speeds available by manipulating

1924-430: 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

1998-434: Is required to be made as robust as possible due to the cutting forces involved, which can distort a lightly built housing, and induce harmonic vibrations that will transfer through to the workpiece, reducing the quality of the finished workpiece. The main spindle is generally hollow to allow long bars to extend through to the work area. This reduces preparation and waste of material. The spindle runs in precision bearings and

2072-472: Is the name applied to a traditional late-19th-century or 20th-century lathe with automatic feed to the cutting tool, as opposed to early lathes which were used with hand-held tools, or lathes with manual feed only. The usage of "engine" here is in the mechanical-device sense, not the prime-mover sense, as in the steam engines which were the standard industrial power source for many years. The works would have one large steam engine which would provide power to all

2146-416: Is usually where the tool post is mounted. It provides a smaller amount of movement (less than the cross-slide) along its axis via another feedscrew. The compound rest axis can be adjusted independently of the carriage or cross-slide. It is used for turning tapers, to control depth of cut when screwcutting or precision facing, or to obtain finer feeds (under manual control) than the feed shaft permits. Usually,

2220-669: The Royal Arsenal , Woolwich , in the 1780s by the Verbruggan family also had slide rests. The story has long circulated that Henry Maudslay invented it, but he did not (and never claimed so). The legend that Maudslay invented the slide rest originated with James Nasmyth , who wrote ambiguously about it in his Remarks on the Introduction of the Slide Principle , 1841; later writers misunderstood, and propagated

2294-419: The carriage holds the tool bit and moves it longitudinally (turning) or perpendicularly (facing) under the control of the operator. The operator moves the carriage manually via the handwheel (5a) or automatically by engaging the feed shaft with the carriage feed mechanism (5c) . This provides some relief for the operator as the movement of the carriage becomes power assisted. The handwheels (2a, 3b, 5a) on

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2368-406: The 1970s. Early carbides were attached to toolholders by brazing them into a machined 'nest' in the tool holders. Later designs allowed tips to be replaceable and multi faceted, allowing them to be reused. Carbides tolerate much higher machining speeds without wearing. This has led to machining times shortening, and therefore production growing. The demand for faster and more powerful lathes controlled

2442-406: The advent of cheap computers, free operating systems such as Linux , and open source CNC software, the entry price of CNC machines has plummeted. A Swiss-style lathe is a specific design of lathe providing extreme accuracy (sometimes holding tolerances as small as a few tenths of a thousandth of an inch—a few micrometers ). A Swiss-style lathe holds the workpiece with both a collet and

2516-572: The base-model product for the "luxury model" to improve upon. In other cases, especially when comparing different brands, the quality differential between (1) an entry-level center lathe built to compete on price, and (2) a toolroom lathe meant to compete only on quality and not on price, can be objectively demonstrated by measuring TIR, vibration, etc. In any case, because of their fully ticked-off option list and (real or implied) higher quality, toolroom lathes are more expensive than entry-level center lathes. Turret lathes and capstan lathes are members of

2590-431: The building of a toolroom model to make it the smoothest-running, most-accurate version of the machine that can be built. However, within one brand, the quality difference between a regular model and its corresponding toolroom model depends on the builder and in some cases has been partly marketing psychology. For name-brand machine tool builders who made only high-quality tools, there wasn't necessarily any lack of quality in

2664-401: The bull gear. Later machines use a gear box driven by a dedicated electric motor. A fully 'geared head' allows the operator to select suitable speeds entirely through the gearbox. The bed is a robust base that connects to the headstock and permits the carriage and tailstock to be moved parallel with the axis of the spindle. This is facilitated by hardened and ground bedways which restrain

2738-424: The carriage and its related slides are usually calibrated, both for ease of use and to assist in making reproducible cuts. The carriage typically comprises a top casting, known as the saddle (4) , and a side casting, known as the apron (5) . The cross-slide (3) rides on the carriage and has a feedscrew which travels at right angles to the main spindle axis. This permits facing operations to be performed, and

2812-436: The carriage and tailstock in a set track. The carriage travels by means of a rack and pinion system. The leadscrew of accurate pitch, drives the carriage holding the cutting tool via a gearbox driven from the headstock. Types of beds include inverted "V" beds, flat beds, and combination "V" and flat beds. "V" and combination beds are used for precision and light duty work, while flat beds are used for heavy duty work. When

2886-497: The compound rest has a protractor marked in its base (2b) , enabling the operator to adjust its axis to precise angles. The slide rest (as the earliest forms of carriage were known) can be traced to the fifteenth century. In 1718 the tool-supporting slide rest with a set of gears was introduced by a Russian inventor Andrey Nartov and had limited usage in the Russian industry. The first fully documented, all-metal slide rest lathe

2960-405: The cone which could be engaged to provide a lower set of speeds than was obtainable by direct belt drive. These gears were called back gears . Larger lathes sometimes had two-speed back gears which could be shifted to provide a still lower set of speeds. When electric motors started to become common in the early 20th century, many cone-head lathes were converted to electric power. At the same time

3034-541: The depth of cut to be adjusted. This feedscrew can be engaged, through a gear train, to the feed shaft (mentioned previously) to provide automated 'power feed' movement to the cross-slide. On most lathes, only one direction can be engaged at a time as an interlock mechanism will shut out the second gear train. Cross-slide handwheels are usually marked in terms of the part's diameter , so one graduation representing .001 inches of diameter corresponds to .0005 inches of cross-slide motion. The compound rest (or top slide ) (2)

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3108-405: The direction of lathe development. The availability of inexpensive electronics has again changed the way speed control may be applied by allowing continuously variable motor speed from the maximum down to almost zero RPM. This had been tried in the late 19th century but was not found satisfactory at the time. Subsequent improvements in electric circuitry have made it viable again. A toolroom lathe

3182-614: The error. However, Maudslay did help to disseminate the idea widely. It is highly probable that he saw it when he was working at the Arsenal as a boy. In 1794, whilst he was working for Joseph Bramah , he made one, and when he had his own workshop used it extensively in the lathes he made and sold there. Coupled with the network of engineers he trained, this ensured the slide rest became widely known and copied by other lathe makers, and so diffused throughout British engineering workshops. A practical and versatile screw-cutting lathe incorporating

3256-638: 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

3330-436: The handwheel and spindle, where large drills may necessitate the extra leverage. The tool bit is normally made of HSS, cobalt steel or carbide. Long workpieces often need to be supported in the middle, as cutting tools can push (bend) the work piece away from where the centers can support them, because cutting metal produces tremendous forces that tend to vibrate or even bend the workpiece. This extra support can be provided by

3404-495: The home workshop or MRO shop. The same advantages and disadvantages apply to these machines as explained earlier regarding 3-in-1 machines . As found elsewhere in English-language orthography, there is variation in the styling of the prefixes in these machines' names. They are alternately styled as mini lathe , minilathe , and mini-lathe and as micro lathe , microlathe , and micro-lathe . A lathe specialized for

3478-458: The idea of having a lathe, milling machine, and drill press all in one affordable machine tool. These are exclusive to the hobbyist and MRO markets, as they inevitably involve compromises in size, features, rigidity, and precision in order to remain affordable. Nevertheless, they meet the demand of their niche quite well, and are capable of high accuracy given enough time and skill. They may be found in smaller, non-machine-oriented businesses where

3552-432: The lantern style, or to four tools with the four-sided type. Interchangeable tool holders allow all tools to be preset to a center height that does not change, even if the holder is removed from the machine. The tailstock is a tool (drill), and center mount, opposite the headstock. The spindle (T5) does not rotate but does travel longitudinally under the action of a leadscrew and handwheel (T1) . The spindle includes

3626-441: The larger variants are usually called automatic chucking machines , automatic chuckers , or simply chuckers . Screw machines usually work from bar stock, while chuckers automatically chuck up individual blanks from a magazine. Typical minimum profitable production lot size on a screw machine is in the thousands of parts due to the large setup time. Once set up, a screw machine can rapidly and efficiently produce thousands of parts on

3700-614: The lathe is rotated so it takes the form of a turntable on which parts are placed. This orientation is less convenient for the operator, but makes it easier to support large parts. In the largest, the turntable is installed flush with the floor, with the headstock recessed below, to facilitate loading and unloading workpieces. Because operator access is less of an issue for them, CNC vertical turning machines are more popular than manual vertical lathes. Specialised lathes for machining long workpieces such as segments of drill strings. Oil country lathes are equipped with large-bore hollow spindles,

3774-434: The least) a headstock, bed, carriage, and tailstock. Better machines are solidly constructed with broad bearing surfaces ( slide-ways ) for stability, and manufactured with great precision. This helps ensure the components manufactured on the machines can meet the required tolerances and repeatability. The headstock (H1) houses the main spindle (H4) , speed change mechanism (H2, H3) , and change gears (H10) . The headstock

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3848-468: The machine will continue to turn out parts under the occasional supervision of an operator. The machine is controlled electronically via a computer menu style interface, the program may be modified and displayed at the machine, along with a simulated view of the process. The setter/operator needs a high level of skill to perform the process. However, the knowledge base is broader compared to the older production machines where intimate knowledge of each machine

3922-413: The machines via a line shaft system of belts. Therefore, early engine lathes were generally 'cone heads', in that the spindle usually had attached to it a multi-step pulley called a cone pulley designed to accept a flat belt. Different spindle speeds could be obtained by moving the flat belt to different steps on the cone pulley. Cone-head lathes usually had a countershaft ( layshaft ) on the back side of

3996-426: 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, 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

4070-419: The number of turns the spindle makes, to the number of turns the leadscrew makes. This ratio allows screwthreads to be cut on the workpiece without the aid of a die . Some lathes have only one leadscrew that serves all carriage-moving purposes. For screw cutting, a half nut is engaged to be driven by the leadscrew's thread; and for general power feed, a key engages with a keyway cut into the leadscrew to drive

4144-505: The occasional small part must be machined, especially where the exacting tolerances of expensive toolroom machines, besides being unaffordable, would be overkill for the application from an engineering perspective. Mini-lathes and micro-lathes are miniature versions of a general-purpose center lathe (engine lathe). They typically only handle work of 3 to 7 in (76 to 178 mm) diameter (in other words, 1.5 to 3.5 in (38 to 89 mm) radius). They are small and affordable lathes for

4218-412: 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 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

4292-553: The part as it is cut off, and accepts it for second operations, then ejects it into a bin, eliminating the need to have an operator manually change each part, as is often the case with standard CNC turning centers. This makes them very efficient, as these machines are capable of fast cycle times, producing simple parts in one cycle (i.e., no need for a second machine to finish the part with second operations), in as little as 10–15 seconds. This makes them ideal for large production runs of small-diameter parts. As many Swiss lathes incorporate

4366-441: The part is held firmly with little chance of deflection or vibration occurring. This style of lathe is commonly used under CNC control. Most CNC Swiss-style lathes today use one or two main spindles plus one or two back spindles (secondary spindles). The main spindle is used with the guide bushing for the main machining operations. The secondary spindle is located behind the part, aligned on the Z axis. In simple operation it picks up

4440-471: 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

4514-598: The rail car, portable types that are easily transported for emergency wheel repairs, and CNC versions which utilize computer-based operating systems to complete the wheel repair. A lathe for large diameter, though short work, built over a recess in the floor to admit the lower part of the workpiece thus allowing the toolrest to stand at the turner's waist height. An example is on display at the London Science Museum, Kensington. For even larger diameter and heavier work, such as pressure vessels or marine engines,

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4588-418: The rest design. For minimum transfer rate correcting rests are used. Rest rollers typically cause some additional geometry errors on the processing surface. There are many variants of lathes within the metalworking field. Some variations are not all that obvious, and others are more a niche area. For example, a centering lathe is a dual head machine where the work remains fixed and the heads move towards

4662-446: 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

4736-446: The spindles) is very economical with live tooling, and similarly uneconomical if done as a secondary operation after machining by the Swiss lathe is complete. A 'secondary operation' is a machining operation requiring a partially completed part to be secured in a second machine to complete the manufacturing process. Generally, advanced CAD/CAM software uses live tools in addition to the main spindles so that most parts that can be drawn by

4810-480: The state of the art in gear and bearing practice was advancing to the point that manufacturers began to make fully geared headstocks, using gearboxes analogous to automobile transmissions to obtain various spindle speeds and feed rates while transmitting the higher amounts of power needed to take full advantage of high-speed steel tools. Cutting tools evolved once again, with the introduction of man-made carbides, and became widely introduced to general industry in

4884-437: The task of resurfacing brake drums and discs in automotive or truck garages. Wheel lathes are machines used to manufacture and resurface the wheels of railway rolling stock . When wheels become worn or compromised from excessive use, this tool can be used to re-cut and recondition the wheel. There are a number of different wheel lathes available including underfloor variations for resurfacing wheels that are still attached to

4958-457: The tool bit moves, the follower rest "follows along" (because they are both rigidly connected to the same moving carriage). Follower rests can provide support that directly counteracts the springing force of the tool bit, right at the region of the workpiece being cut at any moment. In this respect they are analogous to a box tool . Any rest transfers some workpiece geometry errors from base ( bearing surface ) to processing surface. It depends on

5032-399: The toolpath. (The latter is due to the toolpath being controlled by the machine, either in jig -like fashion via the mechanical limits placed on it by the turret's slide and stops, or via computer-directed servo mechanisms on CNC lathes.) There is a tremendous variety of turret lathe and capstan lathe designs, reflecting the variety of work that they do. A gang-tool lathe is one that has

5106-525: The trio of leadscrew, change gears, and slide rest was Maudslay's most important achievement. The tool bit is mounted in the toolpost (1) which may be of the American lantern style, traditional four-sided square style, or a quick-change style such as the multi-fix arrangement pictured. The advantage of a quick change set-up is to allow an unlimited number of tools to be used (up to the number of holders available) rather than being limited to one tool with

5180-490: The workpiece and machine a center drill hole into each end. The resulting workpiece may then be used "between centers" in another operation. The usage of the term metal lathe may also be considered somewhat outdated these days. Plastics and other composite materials are in wide use and, with appropriate modifications, the same principles and techniques may be applied to their machining as that used for metal. The terms center lathe , engine lathe , and bench lathe all refer to

5254-430: 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

5328-415: 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

5402-745: Was considered essential. These machines are often set and operated by the same person, where the operator will supervise a small number of machines (cell). The design of a CNC lathe varies with different manufacturers, but they all have some common elements. The turret holds the tool holders and indexes them as needed, the spindle holds the workpiece and there are slides that let the turret move in multiple axes simultaneously. The machines are often totally enclosed, due in large part to occupational health and safety (OH&S) issues. With rapid growth in this industry, different CNC lathe manufacturers use different user interfaces which sometimes makes it difficult for operators as they have to be acquainted with them. With

5476-570: Was invented by Jacques de Vaucanson around 1751. It was described in the Encyclopédie a long time before Maudslay invented and perfected his version. It is likely that Maudslay was not aware of Vaucanson's work, since his first versions of the slide rest had many errors that were not present in the Vaucanson lathe. In the eighteenth century the slide rest was also used on French ornamental turning lathes. The suite of gun boring mills at

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