Requirements of the shaft
Even more important than a correct interference fit of the Oil Seal is a perfectly smooth shaft in the region of the seal, particularly if shaft surface speed is high and the medium to be sealed is under a certain amount of excess pressure. The surface roughness of the shaft depends on the average profile depth Ra of the tool marks caused by the machining process. Oil Seals made of PTFE require, independent of the surface speed, a surface roughness of between 0,1 to 0,2 mm, because PTFE has less wear resistance than rubber seals. For normal circumstances, the shaft in the region of the seal must have a surface roughness of approximately: To summarize, the surface of the shaft in the region of the seal should not have noticeable machining marks. For pivoting shafts and other difficult or critical sealing applications, it is recommended that Oil Seals with a helical groove hydrodynamic pattern, which has a pumping effect, be used. When grinding and polishing, an axial movement of the grindstone along the shaft must be avoided in order to prevent machine lay.
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In addition to being practical, waterproof beach mats are designed with convenience in mind. Many models are lightweight and easy to fold, making them simple to transport from your home to the beach. Some mats even come with carrying straps or bags, ensuring that you can take your mat anywhere, whether you are heading to a local beach, a picnic by the lakeside, or hiking to a hidden cove. This portability is especially appreciated by families, travelers, and beachgoers who often juggle various items while enjoying the outdoors.
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