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2. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   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.

3. Caster angle - Wikipedia

   en.wikipedia.org/wiki/Caster_angle

   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 ...

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5. Continuous casting - Wikipedia

   en.wikipedia.org/wiki/Continuous_casting

   Billet casters cast smaller section sizes, such as below 200 mm square, with lengths up to 12 m long. Cast speeds can reach up to 4 m/minute. Rounds: either 500 mm or 140 mm in diameter; Conventional beam blanks: look similar to I-beams in cross-section; 1048×450 mm or 438×381 mm overall; Near net shape beam blanks: 850×250 mm overall

6. Driving wheel - Wikipedia

   en.wikipedia.org/wiki/Driving_wheel

   The number of driving wheels on locomotives varied quite a bit. Some early locomotives had as few as two driving wheels (one axle). The largest number of total driving wheels was 24 (twelve axles) on the 2-8-8-8-2 and 2-8-8-8-4 locomotives. The largest number of coupled driving wheels was 14 (seven axles) on the ill-fated AA20 4-14-4 locomotive.

7. Leading wheel - Wikipedia

   en.wikipedia.org/wiki/Leading_wheel

   The leading wheels (boxed) on Pennsylvania Railroad 1737. The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels. The axle or axles of the leading wheels are normally located on a leading truck. Leading wheels are used to help the locomotive negotiate curves ...