Shoulder screws act as axles, providing a natural place to mount wheels, hubs, and gears. They can support a great deal of weight and come in various sizes. They are useful in designs such as conveyor belts, mechanized sprayers, and door tracks.
Many projects are made much easier by including shoulder screws in the design. Shoulder screws are actually machine bolts that incorporate a barrel feature between the threaded section and the screw head. Acting like an axle, shoulder screws provide a natural place to mount a wheel, hub or gear without requiring a full axle to be designed into the project. The shoulder screw design makes it a good choice for guiding straps and cables, as well as creating points to hook straps and cables.
Any project that requires casters is a good candidate for using shoulder screws. Shoulder screws can be placed around the bottom of the project and wheels can be attached to the project using the screws. The screws come in a wide variety of sizes, making it possible to match almost any wheel hub size with a properly sized shoulder screw. When you run the screws out of a strong, thick material, the design is able to support a great deal of weight.
Some designs, such as conveyor belts or roller belt systems, can be accomplished using shoulder screws to support the belt assembly or to create different lengths of rollers. The screws can be distributed within the design to create a virtual surface of rollers onto which parcels and goods can be rolled, much like a commercially available line of roller conveyors. The shouldered screw assembly can be made even more durable when using a wheel or roller that has bearings on the screw shafts. This way, the wheels are able to roll much easier and the amount of friction that could potentially wear against the screw shank is reduced to almost zero.
There are also designs, such as mechanized sprayers, lawn sprinklers, and manure spreaders, that can use shoulder screws to support the gears needed to operate the device. The use of screws can virtually eliminate the requirement for full length steel axles to support gears, sprockets and drive components within the body of devices. The complete assembly can be produced using shoulder screws on one side of the mechanism and then be finished by screwing the outer cover onto the completed assembly. A small amount of grease on the screw barrel will provide long lasting lubrication for most projects. The screws have the potential to make attaching rollers for use on door tracks and drawer runners a very simple and easy step in that type of project.
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