What is a gib head key

Gib keys, or gib head keys, are tapered and notched machine keys that are used on power transmission keyed shafts to hold pulleys and gears tightly on the shaft. The head of the key serves as a concussion point for hammering without damage to the shaft of the key.

What is taper sunk key?

A tapered sunk key may be removed by driving it out from the exposed small end. If this end is. not accessible, the bigger end of the key is provided with a head called gib. Figure shows the. application of a key with a gib head.

What is feather key?

Definition of feather key in machinery. : a sunk key without taper that is permanently fixed in one of the connected pieces and that is a sliding fit in a keyway in the other so as to permit relative longitudinal motion. — called also spline.

What is tangent key?

Tangent Keys Tangent keys are used in heavy-duty equipment. … These pair of keys are placed right angles to each other and tangent to the surface of the shaft as shown in the fig. each key will withstand the torsion in one direction only.

How do I remove my stubborn Gib key?

They all involve two things: loosening the key (which is probably seized tight) by heat, penetrating oils or solvents, etc.; and removing the key with either a wedge and hammer, a puller of sorts or a percussion/impact/slide hammer to shock it loose. Of course, if all else fails, you can drill it out.

What is the purpose of providing a head at the end of a taper sunk key?

It may be noted that a parallel key is a taperless and is used where the pulley, gear or other mating piece is required to slide along the shaft. It is a rectangular sunk key with a head at one end known as gib head. It is usually provided to facilitate the removal of key.

What is the advantage of using gib headed key?

Taper and Gib head Keys • These keys transmit heavy, unidirectional, reversing, and vibrating torques. They are also suited for applications that require periodic key removal. The hub position can be adjusted for the best axial location.

What is Barth key?

The barth key is a square key with bottom too corners beveled. The beveled corner ensures tight fitting and lessing the tendency to twist when driving in either direction. There is a small clearance to permit easy removal and assembly.

What is the disadvantage of keyed joint?

Too much securely fixed keyed joint might become difficult to dismantle. Causes shaft imbalance. They introduce stress points due to the notch effect and reduce shaft strength. Possible axial displacement of hub unless locked by an extra component such as circlip or set screw.

What is key and keyways explain different types of keys?

Keys are temporary fastening and are always made of mild steel because they are subjected to shearing and compressive stresses caused by the torque they transmit. A keyway is the groove cut in the shaft or hub to accommodate a key. Keyways can be milled horizontally or vertically.

Article first time published on

Why is it called a Woodruff key?

ETYMOLOGY OF THE WORD WOODRUFF KEY Named after the Woodruff Manufacturing Co, in Hartford, Connecticut, who first manufactured it in 1892.

Why is it called a feather key?

feath′er key′, [Mach.] Mechanical Engineeringa rectangular key connecting the keyways of a shaft and a hub of a gear, pulley, etc., fastened in one keyway and free to slide in the other so that the hub can drive or be driven by the shaft at various positions along it. Also called feather, spline.

Where is feather key used?

Feather keys are used where the parts mounted on the shafts are required to slide along the shaft such as clutches for gear shifting devices. It is an alternative to a splined connection.

Are Woodruff keys hardened?

Keys are non- hardened and are easy to machine. Use for general purpose applications. Half-moon shaped keys lock pulleys and gears to transmission shafts. Woodruff keys go deep into the keyway shaft and become embeddedbut can still rock and adjust to an angular spine.

What are machine design keys?

key, in machine construction, a device used to prevent rotation of a machine component, such as a gear or a pulley, relative to the shaft on which it is mounted. A common type of key is a square bar that fits half in a groove (keyway) in the shaft and half in an adjoining keyway in the component.

What is the function of a key in engineering?

In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. The key prevents relative rotation between the two parts and may enable torque transmission.

What is the main advantage of sunk key?

The main advantage of sunk key is that it is a _____ drive. Explanation: Sunk key is a positive drive and no slip occurs.

What is the purpose of a keyway in concrete?

a slot in a lock for receiving and guiding the key. (in poured-concrete construction) a longitudinal groove in a footing, or in a pour that has set, providing a key for newly poured concrete. a depression or slot carved into rock to provide a bond or anchorage for a structure, as a dam.

How will you justify that when the key is inserted in the keyways of shaft and the hub and pressed by means of hammer it becomes tight due to wedge action?

(1) When the key is inserted in the keyways of shaft and the hub and pressed by means of hammer, it becomes tight due to wedge action. This insures tightness of joint in operating conditions and prevents loosening of the parts.

How does a key joint work?

A key joint is a pre-manufactured device used to create control joints in concrete structures. … The key joint device is placed into the form work at all locations where control joints are required. Concrete is poured into the forms, and the key joint automatically creates a control joint in the structure.

Where is Saddle key used?

A saddle key is a key which fits in the keyway of the hub only. In this case, there is no keyway on the shaft. It is likely to slip round the shaft under load. Therefore it is used for comparatively light loads.

How many types of Saddle key are there?

Saddle keys are of two types, flat and hollow saddle. The tangent keys are fitted in pair at right angles. Sometimes, keys are made integral with the shaft which fits in the keyways broached in the hub. A flat saddle key is a taper key which fits in a keyway in the hub and is flat on the shaft.

What is a shaft a key and a keyway?

Usually the term keyseat is referred as a groove or pocket on a shaft, and a keyway is a slot in a hub in which the key fits into. The complete system is called a keyed joint (Figure 2). (Figure 2) Keys are made of varied types of materials, and also come in different shapes and sizes.

What is the main difference between sunk and saddle 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 circumference of the shaft. Power transmission is achieved through friction between the shaft and the key.

Which key is used in automobile shaft?

Explanation: Normally in Automobile shafts Woodruff key is used.

When would you use a Woodruff key?

A woodruff key is a half‑moon shaped machine key that prevents gears, hubs, or other components from moving independently of a rotating shaft or spindle. They also act as a fail‑safe that protects expensive parts by shearing under excessive loads.

Can Woodruff key be used as feather?

Disadvantageous or drawbacks of woodruff keys are that the depth of the keyway weakens the shaft, cannot be used as a feather key, is difficult and small to install.