🎰 Standard Woodruff Keys - Metal Fasteners ANSI Standard Dimensions

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Woodruff Keys. P – Bare Steel. DIN ISO DIN Technical Specifications Β· ISO Tolerances. DIN Woodruff Key - product drawing - l=​length.


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Keyseat Dimensions for Woodruff Keys per. ANSI B | Engineers Edge | rating.lesnoy-dvor44.ru
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The Woodruff Key numbers indicate normal key dimensions. The last two digits give the nominal diameter B in eighths of an inch and the digits preceding the.


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PIECES. ASSORTMENT. ASSORTIMENT. A WOODRUFF KEYS. Put up in a REGULAR SIZE grey enamelled STEEL drawer. All bins.


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Woodruff Keys and Keyslots. This section provides information regarding shapes of Woodruff Keys, Keyslots and the dimensions to be used for different diameter.


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KEY NUMBER, KEY DIMENSIONS, SHAFT DIAMETER, HEIGHT OF KEY ABOVE SHAFT, DEPTH OF KEYWAY. DIAMETER, WIDTH, MINIMUM, MAXIMUM.


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All dimensions are given in inches. The key numbers indicate nominal key dimensions. The last two digits give the nominal diameter B in eighths of an inch and.


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PIECES. ASSORTMENT. ASSORTIMENT. A WOODRUFF KEYS. Put up in a REGULAR SIZE grey enamelled STEEL drawer. All bins.


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Woodruff key sizes, dimensions and tolerances are given in the following chart according to ASME B standard. Woodruff key is almost in semicircular disk.


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ANSI Shaft and Hub Keyseat Dimensions for Woodruff Keys per. Key No. Nominal Size. Keyseat Shaft. Key Above Shaft. Keyseat Hub. Width A*. Depth B.


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In mechanical engineering, a key is a machine element used to connect a rotating machine This type of key was developed by W.N. Woodruff of Connecticut. The keyway is roughed out using a chisel and then filed to size; the key is tried.


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Quick-disconnect QD bushings work similarly, but place a circular pattern of three unthreaded and three fully threaded holes further out from the shaft axis on a bushing flange, instead of across the bushing-to-hub interface. These are rarely used keys, to transmit lower power to the driven members e. Set screws often accompany parallel keys to lock the mating parts into place. In other projects Wikimedia Commons. Shear keys may be any of the designs described above, but are made from a weaker material than the shaft. Broaching is primarily used to cut square cornered internal keyways. Commonly keyed components include gears , pulleys , couplings , and washers. They can also produce blind slots, which are slots that do not extend through the whole workpiece. There are five main types of keys: sunk , saddle , tangent , round , and spline. Retrieved Machine tool operations. The workpiece is properly located and then the reciprocating arm is started. There are three main steps in broaching a keyway: First, the workpiece is set on the arbor press and the bushing is placed in the opening of the workpiece. The tapered key is tapered only on the side that engages the hub. One of the earliest forms of keyseating was done by chiseling. Types of sunk keys: rectangular , square , parallel sunk , gib-head , feather , and Woodruff. If the hole and key are tapered, the key is referred to as a Dutch pin , which is driven in and optionally finished by cutting or grinding flush with the end of the shaft. Keyseating is the creation of the slots in the mating items. A shear key is a feature intended to fail and avoid further damage should the machinery be accidentally operated in excess of its design limits. The keyway is similar to a parallel key, except it extends tangentially out of the external shaft into the internal shaft. The Dutch keyways are threaded only on the alternate hub side or shaft side, with a thread clearance hole form on the opposite side. These types of keys are generally attached to the driving member e. Computer numerical control CNC wire-cut EDM machines allow for a wide variety selection of keyways to be cut, inclusive of multiple keyways on the same hub. Keyseaters , also known as keyseating machines and keyway cutters , are specialized machines designed to cut keyways. They have a square or rectangular cross-section. Parallel keys are the most widely used. These machines can cut other straight sided features other than keyways see the picture. Wikimedia Commons has media related to Keys and keyways.{/INSERTKEYS}{/PARAGRAPH} Finally, shims are placed between the bushing and the broach to achieve the correct depth necessary for the key. For example, a steel shaft and pulley may employ a brass key. The main advantage of the Wood-ruff key is the elimination of milling near shaft shoulders, where stress concentrations , [4] and concentricity would be affected. Namespaces Article Talk. Keyseating can be done on a variety of different machines including a broach, a keyseater, wire-cut EDM, a shaper or vertical slotting machine, either a vertical or horizontal mill, or with a chisel and file. Common applications include machine tools , automotive applications, snowblowers and marine propellers. Hidden categories: Harv and Sfn no-target errors Wikipedia articles needing clarification from October Commons category link is on Wikidata. This latter point means that for reversible motion of the shaft, another key along a tangent outwards in the opposing direction is needed. Two parallel keys can be used if the shaft connection requires a higher torque rating. This technique is long, tedious, and rarely used anymore. Main article: Spline mechanical. The whole system is called a keyed joint. A Scotch key or Dutch key features a circular keyway hole instead of rectangular , produced by drilling axially into the assembled hub and shaft, with a metal dowel pin serving as the key. The specific broach, bushing and guide are used for each given keyway cross-section, which makes this process more expensive than most of the alternatives. However, it can produce the most accurate keyway out of all the processes. Taper-Lock bushings are keyed hub fittings which provide three threaded Dutch keyways and two setscrews as Dutch keys, in addition to the rectangular keyway. Introducing an additional bushing component between hub and shaft improves the performance and convenience of keyed joints. Some taper keys have a gib , or tab, for easy removal during disassembly. Machinery NY , 70 8 , Machine tool practices. The key prevents relative rotation between the two parts and may enable torque transmission. Some models have a stationary table so the cutter is fed horizontally into the workpiece, while others have a movable table that feeds the workpiece into a fixed cutter. This type of key was developed by W. Parallel, tapered, and Woodruff keyways can be produced on a milling machine. The more exact fit of the key and keyway also reduces play, and stress concentrations in, and improves the reliability of the key. Views Read Edit View history. Tangent keys are used in high-torque heavy-duty applications. Next, the broach is inserted and pushed through, cutting the keyway. A spring pin is self-fastening and does not work loose under vibration. The purpose of the taper is to secure the key itself, as well as, to firmly engage the shaft to the hub without the need for a set screw. Wire-cut electrical-discharge machining EDM is primarily used for small production lot sizes where either extreme precision is required or other cutting technologies are not readily available. The Popular Science Monthly. For a key to function, the shaft and rotating machine element must have a keyway and a keyseat , which is a slot and pocket in which the key fits. End mills or slotting cutters are used for parallel and tapered keyways, while a Woodruff cutter is used for Woodruff keyways. The keyway is roughed out using a chisel and then filed to size; the key is tried frequently to avoid over filing. Woodruff of Connecticut. Shaping or slotting is largely used for cutting keyways that do not extend through the full length of the part. This limited shear strength specification is designed to sustain normal operation, but then give way in the event of excessive shaft torque, thus protecting the rest of the machine from damage. By using this site, you agree to the Terms of Use and Privacy Policy. If a straight Dutch keyway hole is optionally tapped with a thread, then an ordinary screw serves as the threaded Dutch key. Categories : Hardware mechanical Mechanical power transmission. What would have been the side of each keyway forms heels against which the key sits, and transfers force compressively. By simply driving setscrews into selected holes, the hub mechanism conveniently operates to rigidly lock or definitely release from the shaft, without hammering or hub-pulling. Contribute Help Community portal Recent changes Upload file. They are very similar to vertical shapers ; the difference is that the cutting tool on a keyseater enters the workpiece from the bottom and cuts on the down-stroke, while the tool on a shaper enters the workpiece from the top and cuts downward. Square keys are used for smaller shafts and rectangular faced keys are used for shaft diameters over 6. As such, shaper cuts are generally more susceptible to deflection than keyseater cuts. The key may be wedge, rectangular, or square shaped, but particularly rectangular double-taper keys are used. From Wikipedia, the free encyclopedia. An additional advantage is a stuck key can be removed from a shaft with a hammer blow, the circular profile will push the key out of the slot, as opposed to a standard key which will need to be pushed axially, or pulled out of its slot. {PARAGRAPH}{INSERTKEYS}In mechanical engineering , a key is a machine element used to connect a rotating machine element to a shaft. Versatility of keyseating. The process starts by clamping the workpiece to the table with a fixture or vise. Hollow spring pins provide a weaker shear strength than a solid dowel pin, and the strength may be varied by varying the wall thickness. Like keyseating, shaping uses a single-point cutting tool for cutting, however, shapers are not guided through the cut on a fixed post. Spring pins are an alternative Dutch key component, instead of solid dowel pins. Improperly machined keyways that had cutter deflection or drifting occur, may not be strong enough for the required application. The keyway in the hub has a taper that matches that of the tapered key. When excessive torque is applied to the joint, the steel edges shear the brass key into two pieces, leaving the pulley spinning loosely on the shaft and relieving the rest of the machine from possible damage. A Hirth joint is similar to a spline joint but with the teeth on the end of the shaft instead of on the surface. The problem with taper keys is that they can cause the center of the shaft rotation to be slightly off of the mating part. Wire-cut EDM cuts keyways by eroding material away from the workpiece through a series of rapid electric current discharges between a spooling wire and the workpiece through a dielectric liquid. Another difference is a keyseater has a guiding system above the workpiece to minimize deflection, which results in a closer tolerance cut. These types of keys have less strength as compared with the sunk keys. The shear key is easily and inexpensively replaced, and avoids more serious damage to the mechanism that would be costly or difficult to repair. The circular segment can be cut directly by plunge cutting with a circular Wood-ruff cutter without any reliefs.