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However, the larger the diameter of a caster wheel, the higher the caster support arm must be. Either the base of a low-hanging object must be lifted higher above the wheels, or the casters must hang out to the sides straddling the low-hanging supported object. While rotating around the vertical shaft, swivel caster wheels sweep out a space.
The wheels are fastened to the hub by means of a winged, threaded nut, called a "knock-off" or "spinner." Usually, this will feature right-hand threads on the left side of the vehicle, and left-hand threads (rotate clockwise to remove) on the vehicle's right side so the screw-on spinner would stay tightened as the auto was in forward motion. [ 9 ]
Caster angle and trail both influence the steering, albeit in different ways: caster tends to add damping, while trail adds "feel" and returnability. The caster wheel on shopping carts are an extreme case – the system is undamped but stable, as the wheel oscillates around the "correct" path. The construction has relatively high trail, but no ...
An air caster is a pneumatic lifting device used to move heavy loads on flat, non-porous surfaces. Its operation is similar to a hovercraft , as it uses a thin layer of air as a way to float a very small distance off the ground.
Wheel hub with disc brake and 5 wheel studs. Wheel studs are the threaded fasteners that hold on the wheels of many automobiles. They are semi-permanently mounted directly to the vehicle hub, usually through the brake drum or brake disk. Lug nuts are fastened onto the wheel stud to secure the wheel. When a wheel is removed for tire changes etc ...
A trial in January 1952 saw a 52-wagon, 850 ton coal train run 127 miles (204 km) at an average of 38 miles per hour (61 km/h), compared to the usual maximum speed on the Midland main line of 25 miles per hour (40 km/h) for unfitted freight trains. [16] In 1952, 14% of open wagons, 55% of covered wagons and 80% of cattle trucks had vacuum brakes.
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