Ball bearing in spanishexamples

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Ball bearing in spanishpronunciation

Clearance.Determine the maximum clearance present in your application. For a radial seal, subtract the minimum rod (shaft) diameter from the maximum bore diameter. For a face seal, subtract the distance between the sealing surface and the mating surface.

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Cross-section.Select an O-Ring cross-section size from the available standard sizes. If you are unsure what cross-section size to use, see here.

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BalerosinEnglish

Detail the Groove.Complete the groove design by specifying the proper radii and finish as indicated in the figure above.

Groove Width.Refer to the table above to determine the groove width for the O-Ring cross-section size you have selected. If you are using a back-up ring in your application, increase the groove width by the maximum thickness of the back-up ring.

Calculate the Seal Squeeze.Using Equations 3 and 4, calculate the minimum and maximum seal cross-sectional compression (squeeze). The recommended gland values in the table above have been developed to create a proper range of squeeze for many applications involving oil, hydraulic fluid, or normal lubricants, providing component tolerances are sufficiently controlled. In applications involving high pressure, large component tolerances, the need for very low frictional forces, or other types of fluids, the seal and groove design should be verified through an acceptable method, such as testing or engineering analysis.

Select the Seal.Select the proper O-Ring size from the Standard Size table. Start by turning to the section of the table for the cross-section size you have selected, and then finding the O-Ring for the proper size bore or rod (shaft) you are sealing. If the bore or shaft size you are using is not listed, select the O-Ring with an inside diameter just smaller than the shaft you are using. If you are designing a face seal, select the O-Ring with an inside diameter which will position the O-Ring on the side of the groove opposite the pressure. Click here for more information on face seal groove design. Note the O-Ring inside diameter for the next step.

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Check the Clearance.Determine if the clearance is acceptable for the application pressures and the material hardness being used by checking the graph. Minnesota Rubber and Plastics standard-line products are made from materials having a hardness of 70 Shore A. If the clearance is unacceptable, component tolerance will have to be tightened, a harder material will have to be special ordered, or a back-up ring will have to be used. Note: The graph provides clearance values as radial values, so divide the number obtained in the preceding step by 2 to obtain your radial clearance.

Percent Gland Fill.Determine the maximum percent gland fill using Equation 6. If the gland fill exceeds 100%, the groove will have to be redesigned. A good “rule-of-thumb” is to not exceed about 90% gland fill.

Calculate the O-Ring groove dimensions.Using the table above, determine the maximum recommended gland depth for your application. Then, calculate the O-Ring groove diameter as follows:a. For a rod (shaft) seal:O-Ring Max Groove Diameter = Min Shaft Diameter + (2 x Recommended Gland Depth)b. For a bore (piston) seal:O-Ring Min Groove Diameter = Max Bore Diameter – (2 x Recommended Gland Depth)c. For a face seal:O-Ring Max Groove Depth = Recommended Gland Depth – Application ClearanceWith a face seal, if the two surfaces to be sealed are in direct contact (such as with a cover), the seal groove depth is simply the Recommended Gland Depth

Calculate the Seal Stretch.Using Equation 1, calculate the installed seal stretch. If the installed seal stretch is greater than about 3%, you may have to select the next larger O-Ring or require a custom O-Ring for your application. If you are using an O-Ring size less than a number -025, click here for more information.