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The diameter of a caster wheel affects how easily the caster moves over particulate, rough or irregular surfaces. Large diameter caster wheels are able to bridge gaps like that between the floor and an elevator car. However, the larger the diameter of a caster wheel, the higher the caster support arm must be.
The entire sculpture, including the dolly, measures 16.25 in × 16 in. The cube of limestone measures 12 7/16 in on all sides. The oak base is 14 5/8 in × 14 5/8 in. The caster wheels are 2 3/8 in tall. The steel plate upon which the caster wheels rotate is 16 inches in diameter. The block of limestone weighs 85 pounds (39 kg). [1]
Caster displacement moves the steering axis ahead of the axis of wheel rotation, as with the front wheels of a shopping cart. Caster angle moves the steering axis from vertical. [3] In automobile racing, the caster angle may be adjusted to optimize handling characteristics for a particular venue. This is all connected to the front wheels.
The term scrub radius derives from the fact that either in the positive or negative mode, the tire does not turn on its centerline (it scrubs the road in a turn) and due to the increased friction, more effort is needed to turn the wheel. Large positive values of scrub radius, 4 inches/100 mm or so, were used in cars for many years.
The normal force between the 4 wheels and axles is the same (in total) 981 N. Assume, for wood, μ = 0.25, and say the wheel diameter is 1000 mm and axle diameter is 50 mm. So while the object still moves 10 m the sliding frictional surfaces only slide over each other a distance of 0.5 m.
The steering axis angle is called caster angle when ... or the wheel size (diameter) on the trail. ... has a fork with adjustable trail, from 89 to 101 mm [3.50 to 3. ...