A key and the keyways make up a Keyed joint to secure the hub and the shaft to prevent relative movement between a power transmitting shaft and an attached component. For example, Gear drives, Pulleys or Sprockets are connected securely using keys to the power transmitting shaft (Figure 1).
How does a keyed shaft work?
A key is a piece of metal used to connect a rotating machine element to the shaft. A key prevents a relative rotation between the two parts, and may enable torque transmission to occur. For a key to function properly, both the shaft and rotating elements (gear, pulley and coupling) must have a keyway and a keyseat.
How is a keyway formed?
Keyways are formed by milling groves into the key blade creating a final shape. (Watch: Video of Key Milling Tool). There can be one or more milling groves in a key blade. A key blank can be cut into any number of keyways, but the correct tools are required to achieve more complex keyways.
How much torque can a keyway handle?
The limiting pressure point of a keyed shaft is the keyway side of the male shaft, provided the proper key material is selected. Thus, 270 Nm is the maximum torque that can be transmitted before the 19 mm diameter keyed shaft plastically deforms.
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.
How do you identify a keyway?
Look at the large end of the key (also called the bow). If the bow has straight sides and a triangle-shaped top (like a house), you probably have a KW1 keyway. If the key is diamond-shaped (narrower at the top and bottom and wide in the middle), you probably have a SC1 keyway.
What does a keyway mean?
Definition of keyway
1 : a groove or channel for a key. 2 : the aperture for the key in a lock having a flat metal key.
What keyway does Schlage use?
Schlage uses CNC milling complex keyway shapes to mechanically prevent some non-OEM keys from entering or operating a lock. Schlage keyway types including Primus/Primus XP, Everest, Obverse, Reverse, Numbered or Paracentric, and Quad.
What is a shaft key?
The shaft Key is a small metallic component that plays a major role in connecting the shaft and hub with another rotational component such as gears, bearings, etc. Shaft keys are always parallel to the axial of the shaft. There are several types of shaft keys.
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 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.
Which key does not require keyway on the shaft?
Hollow and flat keys
They are only used for transmitting little rotary forces. For these no keyway must be made: – The bottom of hollow keys is concave in longitudinal direction. The edges of these keys resemble cutting edges which contact the shaft.
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 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.
What is keyway factor?
A key factor is defined as the factor in the activities of an undertaking which, at a particular point of time or over a period, will limit the volume of output. Other variant terms are limiting factor, Principal Budget Factor & scarce factor. Limiting factors are governed by both internal & external factors.
What is the difference between keys and splines?
The main difference between splines and keys is that splines are integral with the shaft but keys are inserted between shaft and hub. As compared with one or two keys used for load transmission, there are usually four or more splines on a shaft.
How do you size a keyway?
In the English system, it is standard practice to dimension keyways. The hub keyway is dimensioned by its width and depth on the shaft keyway sides. Referencing Figure 1, the keyway dimension is W x T1. Unless otherwise specified, the shaft keyway is assumed to be standard.
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.
What are woodruff keys made of?
Woodruff keys are crafted in carbon, alloy, and stainless steel. Carbon and alloy steel are both durable, however they must be plated or coated to prevent corrosion. Stainless steel surpasses carbon and alloy steel in corrosion resistance, but it is not as strong.
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 |
|---|
How many keyways are there?
Of course, there are examples of lock manufacturers making replaceable tumblers. Any competitor’s tumbler that’s keyway compliant can be swapped in, but these are fairly rare. For example, Kwikset once made a tumbler that was Schlage compliant, but quit production after 2 years.
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