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.
Why do they call it a Woodruff key?
ETYMOLOGY OF THE WORD WOODRUFF KEY
Named after the Woodruff Manufacturing Co, in Hartford, Connecticut, who first manufactured it in 1892.
How tight should a Woodruff key be?
It is important for key to be somewhat snug and stable in the key seat. If key is not snug/stable then key can easily slide out of key seat due to the curved profile on the bottom. This is very inconvenient in cases where it is difficult to see as the pulley is installed.
What is saddle key?
Definition of saddle key
: a key for securing a member to a machine shaft that fits into a keyway in the secured member and is concave to grip the shaft by friction compare flat key, sunk key.
What is Kennedy key?
The Kennedy key consists of two square keys. The hub is bored off the centre and the two keys force the hub and the shaft to a concentric position. Kennedy key is used for heavy duty applications.
What is sunk key?
Definition of sunk key
: a key that fits into keyways in both the shaft and the secured member in machinery compare saddle key.
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 is the purpose of key?
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 shape of Woodruff key?
semicircular shaped
Woodruff keys are semicircular shaped, such that, when installed, leave a protruding tab. The keyway in the shaft is a semi-circular pocket, the mating part, a longitudinal slot. They are used to improve the concentricity of the shaft and the mating part, which is critical for high speed operation.
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.
What does the key of A flat look like?
A-flat major (or the key of A-flat) is a major scale based on A?, with the pitches A?, B?, C, D?, E?, F, and G.
A-flat major.
| Relative key | F minor |
| Parallel key | A-flat minor enharmonic G-sharp minor |
| Dominant key | E-flat major |
| Subdominant | D-flat major |
| Component pitches |
|---|
Which consists of two square key is called?
The Two-square cipher, also called double Playfair, is a manual symmetric encryption technique.The technique encrypts pairs of letters (digraphs), and thus falls into a category of ciphers known as polygraphic substitution ciphers.
Are there metric Woodruff keys?
Stanho metric woodruff keys are supplied to DIN 6888 / ISO 3912 in C45k key steel and are made to minus tolerances (h9 on width and h12 on height).
What is the thickness of a flat bottom Woodruff key No 606?
For example, the flat bottom variant of a #606 Woodruff key is 6/8or 3/4inch long and 6/32or 3/16inch thick.
How do you measure a keyway?
Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway.
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.
What are keyways made of?
Typically, key stock is made from carbon steel or stainless steel, but can also be made from aluminum, brass, copper, monel, and even nylon, all with varying material grades. AISI 316 stainless is also available for marine applications.
What are the function of key in machine design?
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.
How do you get a woodruff key out?
Remove the Woodruff key.
- Try tapping down on one end of the key with a hammer and nail.
- Rapidly heating the key with a blowtorch and letting it cool can help loosen it.
- Remember that these keys are cheap and readily available online or at hardware and auto part stores, so causing damage to it may be necessary.
How do you remove a sheared woodruff key?
The trick is to smack one side of the key and use it as a fulcrum to get the semicircle to rotate in its seat. Once one side is sticking out, the key can be further loosened by smacking it so that it rotates back and forth, until it can be grasped by pliers or vice grips and yanked out.
How do I get rid of the feather key?
The normal way to remove the key is to use a small cold chisel to impact the edge of the key in order to force it from its slot in the shaft. The exposed end of the key can be ground with a die grinder so that a “v” grove is formed in the end of the key.
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