Dead centre (engineering): Difference between revisions
Dead Centre (talk | contribs) added a musician with the same name. |
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* [[US]] usage, a [[lathe center]] |
* [[US]] usage, a [[lathe center]] |
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* [[UK]] usage, in a [[reciprocating engine]], the position of a piston in which it is furthest from, or nearest to, the crankshaft. See [[top dead centre]]. |
* [[UK]] usage, in a [[reciprocating engine]], the position of a piston in which it is furthest from, or nearest to, the crankshaft. See [[top dead centre]]. |
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[[Bicycle]] cranks have dead centres at approximately 12 o'clock and 6 o'clock where simple pushing down of the pedal will not turn the [[chainwheel]], but the rider's leg is able to apply tangential force at the pedal to overcome it. [[Fixed gear bicycles]] (without a [[freehub]]) use the [[momentum]] of the bicycle and rider to keep the chainwheel turning even if the rider makes no attempt to pedal in a circular motion. |
[[Bicycle]] cranks have dead centres at approximately 12 o'clock and 6 o'clock where simple pushing down of the pedal will not turn the [[chainwheel]], but the rider's leg is able to apply tangential force at the pedal to overcome it. [[Fixed gear bicycles]] (without a [[freehub]]) use the [[momentum]] of the bicycle and rider to keep the chainwheel turning even if the rider makes no attempt to pedal in a circular motion. |
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Revision as of 15:18, 7 September 2007
Music Dead Centre is a Death Metal band based in jacksonville florida. www.deadcentreonline.com for most up-to-date information
- US usage, a lathe center
- UK usage, in a reciprocating engine, the position of a piston in which it is furthest from, or nearest to, the crankshaft. See top dead centre.
More generally, the dead centre is any position of a crank where the applied force is straight along its axis, meaning no turning force can be applied. Crank-driven machines rely on the energy stored in a flywheel to overcome the dead centre, or are designed, in the case of multi-cylinder engines, so that dead centres can never exist on all cranks at the same time. A steam locomotive is an example of the latter, the connecting rods being arranged such that the dead centre for each cylinder occurs out of phase with the other one (or two) cylinders.
Bicycle cranks have dead centres at approximately 12 o'clock and 6 o'clock where simple pushing down of the pedal will not turn the chainwheel, but the rider's leg is able to apply tangential force at the pedal to overcome it. Fixed gear bicycles (without a freehub) use the momentum of the bicycle and rider to keep the chainwheel turning even if the rider makes no attempt to pedal in a circular motion.
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