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Energy is never really lost, it is only shu ed around into di erent forms Kinetic energy is converted into potential energy, which might be stored as deformation in a spring or as a displacement against gravity These might eventually be turned back into kinetic energy So energy changes form, but it never goes away So why does the brick stop moving when you push it across your desk Where is the kinetic energy going The energy you are adding to the brick is being lost into the desk through friction Friction is what we call the process of transferring energy by rubbing things together The force of friction always appears to act in the opposite direction of the kinetic energy causing the friction Because of this, an object rubbing against another object slows down and stops There are two kinds of friction.



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symmetric guideways [6]

An object at rest on a surface has a higher friction than an object that is already moving The stationary, or static, friction force is called stiction When you press on the brakes in your car, the force holding the wheel to the road is this stiction Once you start skidding, the lesser force of friction takes over Once the wheels start to get hot and melt, it gets even more di cult Friction can be an extremely complicated thing, especially if either of the objects being rubbed together are sticky, fuzzy, oily, or otherwise not dry and smooth Plain vanilla friction is molecules, by way of their atomic forces, banging against each other Let s look down into the atoms of the object and see what this banging means to them Everything that you come into contact with has heat.

unsymmetric guideways [6]





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In conventional machines, internal and external flat guideways are suitable for normal accuracy requirements (Figure 514) The setting involves straight or tapered gibs Generally, it requires good workmanship and proper protection from chips On the other hand, the dovetail is used when there is a limitation on the height of the guideways (Figure 515) It is not suitable where forces tend to pull out the guides Finally, the circular guideway is well suited for axial loading and is relatively easy to manufacture (Figure 516)

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Heat is a form of energy and, in fact, it is a form of energy stored by motion Each atom within an object is not just sitting there quietly but is vibrating madly against the springy forces that keep it from escaping This vibration is described as the heat of the object The faster the atoms in an object are moving, the more energy it is storing; it s hotter Of course, if something gets too hot, the atoms get enough energy to break their springs and they escape At one temperature the springs are only mostly broken, so the object doesn t hold together as rmly and its atoms are pulled down by gravity It melts Get it even hotter and the atoms have enough energy to jump up away from gravity s pull and the attraction of its neighbors and the object evaporates, or becomes a gas.

Fig 514: External and internal flat guideways [6]

Fig 515: External and internal dovetail guideways [6]

Of course, like almost everything else in this book, it s a bit more complicated than that But you get the general idea When you hold a hot object against a cold object, the atoms in the hot object bang into the atoms in the cold object, making the slower atoms move.

In general, internal guideways are chosen when the sliding velocity is high, and it is essential to provide a good retention of the lubricant at the interface On the other hand, when the sliding velocity is not that high and it is necessary to prevent chip accumulation and to ensure its easy removal, the external guideway is preferred In ultra-precision machines, it is common to use bellows for protection against chips and dirt

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