a groove in a shaft, the hub of a wheel, etc., for receiving part of a key holding it to another part. 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.
What is the meaning of keyway?
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 is the purpose of a keyway in concrete?
The keyway will act as the slab edge for the pour. When forces push one slab vertically from the other, the keyway construction joint will hold the two slabs together. Keyways are typically applied in commercial settings.
What is a keyway and how is it 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.
What is a keyway on a valve?
noun A form of socket-wrench having a T-head, or other shape resembling the winding-key of a clock, which fits the squared or prismatic shape on the end of a valve spindle. It is designed for use where the valve should not be opened or shut except by one duly authorized and possessing such a key or wrench.
What is the main advantage of sunk key?
6. The main advantage of sunk key is that it is a _____ drive. Explanation: Sunk key is a positive drive and no slip occurs. 7.
What is a key in concrete footing?
The “key” is supposed to help to transfer shear across the joint. In the US, the blockout is typically formed by placing a 2×4 (2 in x 4 in nominally) board in the fresh concrete. Sometimes a rubber or plastic waterstop is cast into the concrete at these locations to help keep water from flowing through the joint.
What is a screed key?
Screed Key gives a smooth, flush surface joint which requires no filling. Minimizes random cracking and provides proper load transfer from slab to slab. More economical than simple bulk-headed forms which must be prepared, installed, stripped, cleaned, repaired or replaced and stored.
What is contraction joint?
Contraction Joints
A contraction joint is a sawed, formed, or tooled groove in a concrete slab that creates a weakened vertical plane. It regulates the location of the cracking caused by dimensional changes in the slab.
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.
How are keyways machined?
Keyway cutting with a keyseater machine (or internal keyway slotting machine) removes material through a series of tooth cutting strokes. Some keyseaters only feature a single tooth cutter, while other machines (like the Davis Keyseater) use a multiple tooth cutter to achieve cutting speeds as fast as broaching.
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 are the different types of keyways?
Types. There are five main types of keys: sunk, saddle, tangent, round, and spline.
What is key interlock?
Key interlocks are dual-keyed mechanical locking devices designed as integral-fit attachments to the host equipment and operate on a ‘key transfer’ principle.Typically key interlock systems are applied to valves, closures, switches or any form of equipment which is operated by human intervention.
What size is a water key?
Water Key, Size 1/4 in, 9/32 in, 5/16 in, 11/32 in, Handle Shape T, Overall Length 3 5/32 in.
What is a water key used for?
A water key is a valve or tap used to allow the drainage of accumulated fluid from wind instruments. It is otherwise known as a water valve or spit valve.
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 exterior plywood made specifically to sheath concrete forms?
Virtually any Exterior type APA panel can be used for concrete formwork because all such panels are manufactured with moisture resistant adhesive. For concrete forming the plywood industry produces a special product called Plyform®, which is recommended for most general forming uses.
What is a slab on grade home?
A slab-on-grade is a type of shallow foundation in which a concrete slab rests directly on the ground below it. A slab-on-grade foundation usually consists of a thin layer of concrete across the entire area of the foundation with thickened footings at the edges or below load bearing walls in the middle of the building.
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