C. Why the machine has to be supplied with oil from time to time?
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Oil lubrication is generally used where high speeds or operating temperatures prohibit the use of grease, when it is necessary to transfer frictional heat or other applied heat away from the bearing, or when the adjacent machine parts, e.g. gears, are oil lubricated.
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The main point of lubrication is to stop friction damage between moving parts. People use lubricants in a variety of different applications, from bike chains to sewing machines. Lubricants are even more important when your entire company relies on the condition of your machines.
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