Keyed Shaft, Dia. 5/8 In, 6 In L, CS

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When the connection rotates, the shaft and hub (mating part) exert opposing forces on the key, attempting to shear the key. The maximum torque that can be transmitted before exceeding the yield strength of the key is calculated as: They are mostly used to transmit only unidirectional torques subjected to lighter initial loads, or in applications that require periodic clearance or sliding of the hub, as the drive component may become free due to multi-axial torches, While the major loosens and gets trapped inside. Machine, the reason for failure. 4. Gib head key Compared to sunk keys, saddle keys are not sunk into the shaft and hub instead they are only sunk into the hub. They either sit on a flat or the circumference of the shaft. Power transmission is achieved through friction between the shaft and the key. The saddle keys are of the following two types: Like other types of shafts, they are available in a collection of styles, including ball splines, crowned splines, helical splines, serrations, and parallel splines. Keyed Shafts can be found in industries ranging from automotive manufacturing to aerospace engineering. Professionals use them in everything from electric motors and transmissions to pumps and compressors. Find the Keyed Shafts You Need at Zoro

This type of key was developed by William N. Woodruff of Hartford Connecticut. In 1888, he was awarded the John Scott Medal by the Franklin Institute for his invention. [5] 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. Shear keys may be any of the designs described above, but are made from a weaker material than the shaft. The shear key is easily and inexpensively replaced, and avoids more serious damage to the mechanism that would be costly or difficult to repair. For example, a steel shaft and pulley may employ a brass 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. Occasionally, the keys are formed inseparably with the shaft that fits into the keyway fitted to the hub. Such shafts are known as splendid shafts. These shafts usually have four, six, ten, or sixteen partitions. Peeled shafts are relatively stronger than single keyway shafts. The depth of the slot in both the shaft and the component controls the axial position, but cannot be predetermined. The deeper either slot, the forward key enters axially. A Shaft key is a piece of metal used to connect a rotating machine element to the shaft. A shaft key prevents a relative rotation between the two parts, and may enable torque transmission to occur. For a shaft key to function properly, both the shaft and rotating elements ( gear, pulley, and coupling) must have a keyway and a keyseat.Connecting a shaft and a part is most commonly done by driving a small piece of metal, which is known as the key between the shaft and the hole that has been created in part mounted over it. The key settles in between the shaft and is partly into the part mounted over it. Axial grooves, otherwise known as key ways are cut in the shaft and then in part mounted on it. Then, the key is fitted between the shaft and the attached portion. 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. 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. 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. The main limitations of CNC wire-cut EDM is the time it takes to cut a keyway as well as the size of parts a given wire-cut EDM machine can accommodate. [9] Shaping or slotting [ edit ] The woodruff key is a shaft key made in the form of a segment of a disk and used with shafts not more than 2¹/₂ inches in diameter.

Feather keys are fully contained. It does not set-up to hold the key in position and the wing keys cannot move out of the assembly. An installed wing key cannot run axially. This lets workers subsequently adjust the position of the mounted components along the shaft. a b c d Keys and Keyways (PDF), archived from the original (PDF) on 2011-06-14 , retrieved 2010-03-19. Round: These are used mostly for low power drives. They are circular and fit into holes drilled partly in the shaft and partly in the hub. Round keys are usually considered to be most appropriate for low power drives. These are not as popular as the rounded edge is much more prone to shearing than a square edge. Install them in the shaft to transmit gear from the shaft to the shaft and other components. Machine keys are often the same material and are harder or tougher than the shafts or other components with which they are used. To use a key as part of a sacrifice, choose a soft key that will turn off when exposed to excessive force, so as not to damage expensive equipment. 2. Square Sunk keyImproperly machined keyways that had cutter deflection or drifting occur, may not be strong enough for the required application. [12] See also [ edit ] A hollow saddle key is a taper key that fits into a keyway in the hub and is shaped under the key to fit the curved surface of the shaft. Since hollow saddle keys are gripped by friction, they are suitable for light loads. It is commonly used as a temporary fastener in fixing and installing eccentrics, cams, etc. Tangent key You can easily find the appropriate connection method for your specific application based on the given information. Shaft Keys are made of varied types of materials and also come in different shapes and sizes. The most common key shapes are rectangular or tapered and are typically made of steel.