A-19852, SEPTEMBER 24, 1927, 7 COMP. GEN. 234 - 19852

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Where L = basic rated life (millions of revolutions) C = basic dynamic load rating P = equivalent dynamic bearing load m = exponent in the life equation, m = 3 for ball bearings m = 3.3 for other bearings. Basic Rated Life of Bearings: The basic rated life is defined as the number of revolutions that ninety percent of a group of identical bearings would be expected to achieve. It is determined via the life required of the bearing. Typical life requirements for various machine categories are listed below.

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Static Load Specification: The axial and radial forces acting on the stationary rotary bearing determine the Basic Static Load Rating listed in bearing catalogs. When there are both axial and radial loads on a bearing, the combined static load can be found as follows. Fstatic = Xsrad · Fsrad + Xsax · Fsax

Since we have calculated the equivalent dynamic bearing load we can now compute the bearing dynamic load rating, which is used to select the bearing. Catalog dynamic load rating values should be chosen higher than the computed value for safety. The catalog-listed dynamic load ratings are dependent upon both the equivalent dynamic load and the required bearing life. The ISO equation for the basic rating life is: Where L = basic rated life (millions of revolutions) C = basic dynamic load rating P = equivalent dynamic bearing load m = exponent in the life equation, m = 3 for ball bearings m = 3.3 for other bearings. Basic Rated Life of Bearings: The basic rated life is defined as the number of revolutions that ninety percent of a group of identical bearings would be expected to achieve. It is determined via the life required of the bearing. Typical life requirements for various machine categories are listed below.

When Fsax = 0 or is relatively small up to Fsax/Fdyn = e (The values of Fsrad, Fsax, and e are given in the rolling element bearing data) then Fdyn = Fsrad Since we have calculated the equivalent dynamic bearing load we can now compute the bearing dynamic load rating, which is used to select the bearing. Catalog dynamic load rating values should be chosen higher than the computed value for safety. The catalog-listed dynamic load ratings are dependent upon both the equivalent dynamic load and the required bearing life. The ISO equation for the basic rating life is: Where L = basic rated life (millions of revolutions) C = basic dynamic load rating P = equivalent dynamic bearing load m = exponent in the life equation, m = 3 for ball bearings m = 3.3 for other bearings. Basic Rated Life of Bearings: The basic rated life is defined as the number of revolutions that ninety percent of a group of identical bearings would be expected to achieve. It is determined via the life required of the bearing. Typical life requirements for various machine categories are listed below.

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Static Safety Factor (So) Guidelines Loading Type Noise Irrelevant Normal Operation Quiet Operation ball roller ball roller ball roller Smooth Loading 0.5 1 1 1.5 2 3 Normal Loading 0.5 1 1 1.5 2 3.5 Shock Loading > 1.5 > 2.5 > 1.5 > 3 > 2 > 4

The catalog-listed dynamic load ratings are dependent upon both the equivalent dynamic load and the required bearing life. The ISO equation for the basic rating life is: Where L = basic rated life (millions of revolutions) C = basic dynamic load rating P = equivalent dynamic bearing load m = exponent in the life equation, m = 3 for ball bearings m = 3.3 for other bearings. Basic Rated Life of Bearings: The basic rated life is defined as the number of revolutions that ninety percent of a group of identical bearings would be expected to achieve. It is determined via the life required of the bearing. Typical life requirements for various machine categories are listed below.

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Dynamic Load Specification: The dynamic load specification of a rotary bearing is dependent on both the dynamic and static forces acting upon the bearing. Therefore, please first calculate the Static Load Specification as outlined above. Axial and radial static forces multiplied by dynamic factors combine to form the equivalent dynamic bearing load, which is calculated as follows. Fdyn = Xdrad · Fsrad + Xdax · Fsax Where Fdyn = Equivalent dynamic bearing load Fsrad = Static radial load on bearing Fsax = static axial load on bearing Xdrad = radial dynamic factor (dimensionless) Xdax = axial dynamic factor (dimensionless) When Fsax = 0 or is relatively small up to Fsax/Fdyn = e (The values of Fsrad, Fsax, and e are given in the rolling element bearing data) then Fdyn = Fsrad Since we have calculated the equivalent dynamic bearing load we can now compute the bearing dynamic load rating, which is used to select the bearing. Catalog dynamic load rating values should be chosen higher than the computed value for safety. The catalog-listed dynamic load ratings are dependent upon both the equivalent dynamic load and the required bearing life. The ISO equation for the basic rating life is: Where L = basic rated life (millions of revolutions) C = basic dynamic load rating P = equivalent dynamic bearing load m = exponent in the life equation, m = 3 for ball bearings m = 3.3 for other bearings. Basic Rated Life of Bearings: The basic rated life is defined as the number of revolutions that ninety percent of a group of identical bearings would be expected to achieve. It is determined via the life required of the bearing. Typical life requirements for various machine categories are listed below.

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Selection of an antifriction bearing for a particular application: We now look at one method for selecting a rolling element bearing given a load/life specification. The following table gives a qualitative overview of the characteristics of each rolling element bearing type. We use this table to select the configuration of the bearing. Bearing Type Direction of Load Ratio of Load Misalignment Capacity radial axial both high med low high med low Thrust Ball y y y Deep Groove Ball y y y y Cylindrical Roller y certain types y y Needle Roller y y y Tapered Roller y y y y y Self-aligning Ball y y y y Self-aligning Spherical Roller y y y y Angular Contact Ball y y y y

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Co = So · Fstatic Where Co = The basic load rating So = The static safety factor (dimensionless) Fstatic = The combined, equivalent static bearing load

Basic Rated Life of Bearings: The basic rated life is defined as the number of revolutions that ninety percent of a group of identical bearings would be expected to achieve. It is determined via the life required of the bearing. Typical life requirements for various machine categories are listed below.

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Bearing Type Direction of Load Ratio of Load Misalignment Capacity radial axial both high med low high med low Thrust Ball y y y Deep Groove Ball y y y y Cylindrical Roller y certain types y y Needle Roller y y y Tapered Roller y y y y y Self-aligning Ball y y y y Self-aligning Spherical Roller y y y y Angular Contact Ball y y y y

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Now that we have decided upon the bearing type, we can move on to the more quantitative issue of sizing the bearing. Two metrics that are needed for bearing specification are the static and dynamic load capacities. Static load capacity can specify the bearing if rotational speed is slow, intermittent, and/or subject to shocks. Dynamic load capacity is used when the bearing rotational speed is smooth and relatively constant. Static Load Specification: The axial and radial forces acting on the stationary rotary bearing determine the Basic Static Load Rating listed in bearing catalogs. When there are both axial and radial loads on a bearing, the combined static load can be found as follows. Fstatic = Xsrad · Fsrad + Xsax · Fsax

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The basic static load rating coefficient, Co, can be obtained from: Co = So · Fstatic Where Co = The basic load rating So = The static safety factor (dimensionless) Fstatic = The combined, equivalent static bearing load

Friction in rolling element: A rough and ready rule Friction in rolling element bearings generates heat which can eventually destroy the bearing. With friction in mind, a common rule of thumb used for the allowable speed of ball and straight roller bearings is: ( B + D ) · n/2 < 500,000 Where B = bore diameter in millimeters D = outside diameter in millimeters n = speed in rpm Selection of an antifriction bearing for a particular application: We now look at one method for selecting a rolling element bearing given a load/life specification. The following table gives a qualitative overview of the characteristics of each rolling element bearing type. We use this table to select the configuration of the bearing. Bearing Type Direction of Load Ratio of Load Misalignment Capacity radial axial both high med low high med low Thrust Ball y y y Deep Groove Ball y y y y Cylindrical Roller y certain types y y Needle Roller y y y Tapered Roller y y y y y Self-aligning Ball y y y y Self-aligning Spherical Roller y y y y Angular Contact Ball y y y y

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Fdyn = Xdrad · Fsrad + Xdax · Fsax Where Fdyn = Equivalent dynamic bearing load Fsrad = Static radial load on bearing Fsax = static axial load on bearing Xdrad = radial dynamic factor (dimensionless) Xdax = axial dynamic factor (dimensionless) When Fsax = 0 or is relatively small up to Fsax/Fdyn = e (The values of Fsrad, Fsax, and e are given in the rolling element bearing data) then Fdyn = Fsrad Since we have calculated the equivalent dynamic bearing load we can now compute the bearing dynamic load rating, which is used to select the bearing. Catalog dynamic load rating values should be chosen higher than the computed value for safety. The catalog-listed dynamic load ratings are dependent upon both the equivalent dynamic load and the required bearing life. The ISO equation for the basic rating life is: Where L = basic rated life (millions of revolutions) C = basic dynamic load rating P = equivalent dynamic bearing load m = exponent in the life equation, m = 3 for ball bearings m = 3.3 for other bearings. Basic Rated Life of Bearings: The basic rated life is defined as the number of revolutions that ninety percent of a group of identical bearings would be expected to achieve. It is determined via the life required of the bearing. Typical life requirements for various machine categories are listed below.

( B + D ) · n/2 < 500,000 Where B = bore diameter in millimeters D = outside diameter in millimeters n = speed in rpm Selection of an antifriction bearing for a particular application: We now look at one method for selecting a rolling element bearing given a load/life specification. The following table gives a qualitative overview of the characteristics of each rolling element bearing type. We use this table to select the configuration of the bearing. Bearing Type Direction of Load Ratio of Load Misalignment Capacity radial axial both high med low high med low Thrust Ball y y y Deep Groove Ball y y y y Cylindrical Roller y certain types y y Needle Roller y y y Tapered Roller y y y y y Self-aligning Ball y y y y Self-aligning Spherical Roller y y y y Angular Contact Ball y y y y

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If the bearing is stationary for extended periods or rotates slowly and/or intermittently and is subject to shock loads, then the selection is based upon this basic load rating. Values of basic load rating, Co, for each bearing are quoted in the bearing catalogs. Dynamic Load Specification: The dynamic load specification of a rotary bearing is dependent on both the dynamic and static forces acting upon the bearing. Therefore, please first calculate the Static Load Specification as outlined above. Axial and radial static forces multiplied by dynamic factors combine to form the equivalent dynamic bearing load, which is calculated as follows. Fdyn = Xdrad · Fsrad + Xdax · Fsax Where Fdyn = Equivalent dynamic bearing load Fsrad = Static radial load on bearing Fsax = static axial load on bearing Xdrad = radial dynamic factor (dimensionless) Xdax = axial dynamic factor (dimensionless) When Fsax = 0 or is relatively small up to Fsax/Fdyn = e (The values of Fsrad, Fsax, and e are given in the rolling element bearing data) then Fdyn = Fsrad Since we have calculated the equivalent dynamic bearing load we can now compute the bearing dynamic load rating, which is used to select the bearing. Catalog dynamic load rating values should be chosen higher than the computed value for safety. The catalog-listed dynamic load ratings are dependent upon both the equivalent dynamic load and the required bearing life. The ISO equation for the basic rating life is: Where L = basic rated life (millions of revolutions) C = basic dynamic load rating P = equivalent dynamic bearing load m = exponent in the life equation, m = 3 for ball bearings m = 3.3 for other bearings. Basic Rated Life of Bearings: The basic rated life is defined as the number of revolutions that ninety percent of a group of identical bearings would be expected to achieve. It is determined via the life required of the bearing. Typical life requirements for various machine categories are listed below.

Rolling element bearings are manufactured in a variety of formats. Below you will find a procedure for selecting the correct rolling element bearing type. From this the correct size can be selected. Friction in rolling element: A rough and ready rule Friction in rolling element bearings generates heat which can eventually destroy the bearing. With friction in mind, a common rule of thumb used for the allowable speed of ball and straight roller bearings is: ( B + D ) · n/2 < 500,000 Where B = bore diameter in millimeters D = outside diameter in millimeters n = speed in rpm Selection of an antifriction bearing for a particular application: We now look at one method for selecting a rolling element bearing given a load/life specification. The following table gives a qualitative overview of the characteristics of each rolling element bearing type. We use this table to select the configuration of the bearing. Bearing Type Direction of Load Ratio of Load Misalignment Capacity radial axial both high med low high med low Thrust Ball y y y Deep Groove Ball y y y y Cylindrical Roller y certain types y y Needle Roller y y y Tapered Roller y y y y y Self-aligning Ball y y y y Self-aligning Spherical Roller y y y y Angular Contact Ball y y y y

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Fdyn = Fsrad Since we have calculated the equivalent dynamic bearing load we can now compute the bearing dynamic load rating, which is used to select the bearing. Catalog dynamic load rating values should be chosen higher than the computed value for safety. The catalog-listed dynamic load ratings are dependent upon both the equivalent dynamic load and the required bearing life. The ISO equation for the basic rating life is: Where L = basic rated life (millions of revolutions) C = basic dynamic load rating P = equivalent dynamic bearing load m = exponent in the life equation, m = 3 for ball bearings m = 3.3 for other bearings. Basic Rated Life of Bearings: The basic rated life is defined as the number of revolutions that ninety percent of a group of identical bearings would be expected to achieve. It is determined via the life required of the bearing. Typical life requirements for various machine categories are listed below.

Values of So depend upon the requirements for low-noise operation and the type of bearing, as shown in the following table. Static Safety Factor (So) Guidelines Loading Type Noise Irrelevant Normal Operation Quiet Operation ball roller ball roller ball roller Smooth Loading 0.5 1 1 1.5 2 3 Normal Loading 0.5 1 1 1.5 2 3.5 Shock Loading > 1.5 > 2.5 > 1.5 > 3 > 2 > 4

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