Dangerous Myths About Bearings. How Can People Believe THIS???
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Popular myths about bearings that are fraught with danger. It is not the myth itself that is dangerous, or even the belief in it, but the use of the distorted or unreliable information that this myth carries. And the actions or conclusions that follow from this information carry the danger of damaging or destroying both the bearing itself and the unit or mechanism in which this bearing is installed. 00:00 Introduction 00:32 Myth 1: Not enough lubrication 03:57 Myth 2: Preservative grease 04:46 Myth 3: A sealed bearing can be disassembled and reassembled 06:45 Myth 4: A bearing is a consumable and will endure anything 08:48 Myth 5: Can be heated over an open fire 10:07 Myth 6: Any sealed bearing is better than an open one 12:01 Myth 7: The higher the precision class, the better 13:04 Myth 8: There should be no play or clearances 15:40 Conclusion The video contains the most common misconceptions, such as the claim that a sealed bearing has little lubrication, that the manufacturer saves on grease and does not add it to the bearing, that bearings contain preservative grease from the factory and need to be replaced with normal grease. It also tells whether it is possible to disassemble a sealed bearing, why it is not possible, and what the disassembly and assembly of a sealed bearing can lead to. It explains why bearings must be handled carefully, how to press a bearing correctly, how to remove a bearing, how to press it onto a shaft, why it is not allowed to heat it over an open flame, and what consequences overheating of a bearing leads to. It also explains the difference between a sealed and an open bearing, the difference between a bearing with iron boots and with plastic or rubber ones. The topic of precision classes is also touched upon, why it is useless to install a bearing with a high precision class where there is a normal precision class, and what will happen if the precision class of the installed bearing is lowered where there was a super-high precision class bearing. The myth that the more play a bearing has, the worse it is is dispelled. In fact, there are bearings with different clearances between the rolling elements and the rings. These clearances serve to compensate for thermal deformation. A radial ball bearing is not just a piece of scrap metal, but a rather complex and fragile device.
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