How is L10 life calculated?

How is L10 life calculated?

1. Basic fatigue life rating L10 A bearing’s basic fatigue life rating is calculated using the number of rotations which 90% of all bearings in a specific group achieve or exceed a calculated time without failure (probability of failure: 10%).

What is L10 life and L50 life?

L50 life equals five times the L10 life. In other words, to get a L50 life equal to a L10 80,000-hour life, you must specify the L50 life to be 400,000 hours. The following chart shows a comparison of L10 to L50 equivalents. Bearing Basic Rating Life is theoretical and is based on a collection of statistics.

What is L10 and L50 life of ball bearing?

The L50 or average life is accepted as the bearing life associated with a 50% reliability, i.e., after a stated amount of time, only 50% of a group of identical bearings will not yet have developed metal fatigue. L50 life equals five times the L10 life.

What does L10 mean in reliability?

In the simplest terms, L10 life is calculating, with 90% reliability, how many hours a bearing will last under a given load and speed.

What is L10 value?

By definition the L10 value is the level just exceeded for 10% of the time and takes account of any annoying peaks of noise.

What is minimum life of bearing?

The bearing Dynamic Capacity, C, is defined as the constant stationary radial load which a rolling bearing can theoretically endure for a basic rating life of one million revolutions.

What is l10h life?

Bearing life for recirculating linear bearings, often referred to as the L10 life, is a method of specifying the travel that a bearing can achieve before it reaches its fatigue life, which is the occurrence of the first signs of flaking on the raceways or the rolling elements.

What is life of a bearing?

The fatigue life of an individual bearing is the number of revolutions (or the number of operating hours at a constant speed) that the bearing operates before the first sign of metal fatigue (rolling contact fatigue (RCF) or spalling) occurs on one of its rings or rolling elements.

What is rated life of bearing?

RATING LIFE EQUATIONS Predicted bearing life is a statistical quantity in that it refers to a bearing population and a given degree of reliability. The basic rating life is associated with 90% reliability of bearings built by modern manufacturing methods from high-quality materials and operated under normal conditions.

What is L10mh?

L10mh = life in hours. askf = SKF life modification factor. C = dynamic capacity of the bearing. P = equivalent load on the bearing. p = calculation factor: 3/10 for roller bearing, 3 for ball bearings.

What is B10 and B50 life?

The most frequently heard ratings are B10 and B50. B10 is the expected engine life in miles of operation, many times 1 million, before 10% of all of a specific model of engines in operation will require a major repair, overhaul or replacement, according to Navistar. B50 is 50%.

What is C10 rating of bearing?

A catalog load rating (C10) is defined as the load that causes percent of a group of bearings to fail at the bearing manufacturer’ rating life. 14.

What is the minimum bearing life?

Table I below shows the suggested minimum bearing rating lives for various operating and reliability conditions….Table I.

Operating Condition Minimum L10 Life (Hours)
Continuous 1 shift operation 20,000
Continuous 2 shift operation 40,000
Continuous 24 hour operation 60,000

What does B10 mean on diesel?

It refers to the percentage of biodiesel that is added to the diesel. B7 means 7% of biodiesel content, B10 means 10% of biodiesel content and B20 means 20% of biodiesel content.

What is B10 life diesel engine?

B10 life is the measure of life expectancy a component is designed to meet. Ford engineers designed and tested the Power StrokeĀ® 6.7L V8 Turbo Diesel to over 500,000 simulated F-650/F-750 customer miles, giving the diesel engine a B10 design life of more than 500,000 miles5.

What does C mean in bearing?

The C code of the bearing indicates how much internal clearance the bearing gets in the machine. Your choice is crucial to prevent your bearings from having too much internal clearance.