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Some SPMTs allow the axles to telescope independently of each other so that the load can be kept flat and evenly distributed while moving over uneven terrain. Each axle can also contain a hydrostatic drive unit. A hydraulic power pack can be attached to the SPMT to provide power for steering, suspension and drive functions.
The requirement for power input to an ideal mechanism to equal power output provides a simple way to compute mechanical advantage from the input-output speed ratio of the system. The power input to a gear train with a torque T A applied to the drive pulley which rotates at an angular velocity of ω A is P=T A ω A.
The generally accepted definition of a crane is a machine for lifting and moving heavy objects by means of ropes or cables suspended from a movable arm. As such, a lifting machine that does not use cables, or else provides only vertical and not horizontal movement, cannot strictly be called a 'crane'. Types of crane-like lifting machine include:
If there are n of these parts of the rope supporting the load F B, then a force balance on the moving block shows that the tension in each of the parts of the rope must be F B /n. This means the input force on the rope is F A =F B /n. Thus, the block and tackle reduces the input force by the factor n.
This nifty little tool helps you lift heavy objects like large panels of wood or drywall. It clamps onto the top of the panel and has a handle that lets you carry these large slabs right on your side.
[4] [5] In the extreme case of zero difference in radii, MA becomes infinite, thus no force (besides friction) is needed to move the chain, but moving the chain will no longer lift the load. At the other extreme, when r is zero, the system becomes a simple gun tackle with a mechanical advantage of 2.
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