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1) Voice headset

Earphones and an attached microphone used by operators to interact with computer systems while keeping both hands free to simultaneously perform other tasks.

2) Walkie stacker

A power operated device controlled by an operator standing behind it, which lifts, stacks, and transports pallets.

3) Wireless controls

Just as the name denotes, these controlling devices utilize laser, radio and infrared medium to a relay information to various types of material handling equipment.

4) Vertical creep

Extremely slow speed movement of a scissors lift that is the result of normal, internal leakage of fluid control valves.

5) Vertical travel

The difference between the fully raised height of the platform deck and the fully closed height of the platform deck on a scissors lift.

6) Vertical reciprocating conveyor

A conveyor that moves perpendicular to the floor and provides intermittent operation of a single load-carrying platform or cage which travels up and down on steel rails or guideways. There are many configurations of vertical reciprocating conveyors (VRCs) including those with a single mast, single rail, double mast, double rail and even models which offer incline travel versus strict vertical travel. There are also numerous platform configurations ranging from a simple flat steel surface to a powered roller conveyor deck with controls that are integrated with the controls of powered feed and take away conveyor lines at the different levels.

7) Wall traveling jib crane

A traveling jib crane consisting of a fixed or moveable hoisting mechanism and operating on a runway attached to the side walls or columns of a building.

8) Work station crane

An overhead crane generally used for ergonomic purposes and consisting of bridge(s) and runways made from enclosed metal track.  End trucks attached to the bridge girder allow for ease of movement. The entire system is designed to allow workers to move loads by hand pushing the load with the assistance of a vertical lifting device such as a hoist or vacuum lifter.

9) Wall mounted jib crane

May also be referred to as a bracket mounted jib crane.  The wall mounted jib crane is to the wall of a building by utilizing brackets.  These brackets allow the jib to pivot from wall to wall in a given radius. Jib cranes may also be bracket mounted to columns. These jib cranes usually incorporate tie rods to add stability to the farthest point of the bridge beam.

10) Wide flange track beam

H-shaped, structural steel track beams.

11) Vertical Carousels

As a storage device, a vertical carousel provides for closed loop automatically controlled rotation of the basic storage unit, which in this case may be a shelf that can be subdivided into multiple bin locations. However, a shelf or a given vertical position need not be divided in order to handle large items such as a bolt of fabric or a roll of carpet. Because storage is vertical, such systems are popular when conserving floor space. Although automatic insertion and extraction of individual items or loads is possible, it is not as common as it is with horizontal carousel applications. See also Horizontal Carousels and/or AS/RS .

12) Vertical lift module

A Vertical Lift Module, or VLM is a storage system that consists of two parallel columns each of which is divided into fixed shelf locations that can hold a single storage module such as a tray or tote. The shelving locations are single deep. A tray or tote is inserted, extracted and transported between storage levels and picking locations via an elevator-like device with an automatic shuttle that travels up and down within the space between the storage columns. See also Carousels and/or AS/RS .

13) Wobble stick

A lever type limit switch that uses a fixed long slender rod as the actuator to detect objects moving in all directions in the horizontal plane.

14) Waterfall

Descriptive term for the flanged portion of the wire mesh rack decking.  Most commonly the waterfall extends downwards over the outside face of the beam. The waterfall should extend past the radius of the beam a sufficient distance to minimize the potential for accidental displacement of the decking.

15) Wire mesh spacing

The nominal center-to-center spacing of the wire mesh configuration.