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Specific energy provides a useful measure of how much power (or energy) is required to remove 1 mm3 of metal during machining Using this measure, different work piece materials can be compared in terms of their power and energy requirements for machining For conventional surfaces, whether internal or external grinding, the specific grinding energy, u, required is calculated by the following equation [4][15]: u =

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This type of energy is stored in the object, as height above ground, in the stretch of a spring, or in a chemical reaction waiting to happen. We ll come back to these energies in a minute. First we need to de ne a few more fundamental concepts. Once we start putting these concepts together into mathematical equations, the names are going to get a bit bulky. Instead of using names, we identify each concept by its symbol. We shall be using one- and two-letter symbols for most terms, and sometimes these symbols are even going to be English letters. Greek letters, however, are very popular in math, so hopefully they don t scare you too much. Note that we use the for our multiplication symbol and division is represented by / or, more often, by placing n the numerator above the denominator like . d Not only do we get new symbols to refer to things by, but these symbols are de ned in particular units, which have their own symbols. You are already familiar with many units. For example, time can be measured in seconds, distance in inches, and weight in pounds.





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The plus sign is for up grinding, and the minus sign is for down grinding Since v <<<V, the preceding equation is simplified as u = (27)

where Ft is the tangential grinding force which is derived from measured force components FH and FV, V is the cutting speed, v is the table or workpiece speed, d is the infeed or the wheel depth of cut and b is the width of the cut The forces in a grinding process can be measured quite satisfactorily by means of a dynamometer Wheel and table speed can be adjusted on the machine controller while the remaining variables in the aforementioned equation are readily determined by using simple length The coefficient of friction, , between the grains and workpiece can be estimated from the following expression [16]: m =

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Mechanics is a form of applied physics, and physicists don t always use the units of measurement that we are familiar with. Before we de ne kinetic energy, let s detour through the basic units we need to know. We look at both the metric and English systems of units here, to get a feel for how they relate. We use metric for all of our actual work. Units can be confusing. Even the names for the systems of units can be confusing! What we often call metric units are more correctly called the International System of Units, or SI from the French Syste`me International d Unite s. English units are also known as Imperial units, after the British Empire. Ironically, the United Kingdom has now moved almost entirely over to metric. We aren t even going to think about the third system of measurement, Chinese units or Sh `zh `.

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The Geneva stop gives intermittent motion (Fig. 14-23). In position 1 the Geneva gear is locked against the hub of the crank. The crank is a stud on a disk in this example. In position 1, the crank is entering the slot in the gear. In positions 2 and 3, the crank drives the gear through a partial rotation. The gear has room to move because of the crescent cut out of the crank s hub. Position 4 shows the gear locked into place again.

where FH and FV are the horizontal and vertical components of the grinding force in the sliding mode as illustrated in Figure 323

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Try This: Another useful mechanism, the ratchet, allows motion in one direction but not the other (Fig. 14-24). It consists of a toothed wheel, like a gear, and a pawl that slips between the teeth. As the ratchet wheel rotates

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