Thorough purging of all four bearing seals on each universal joint can help alleviate the possibility of mixing incompatible greases. U-joint cross, broken at a bearing surface. U-joints seldom break off at the bearing surface. It takes a very large shock load to cause this type of failure. It is also very difficult to inspect for this type of failure because they, many times, start as a small crack and progress into a complete failure some time further âdown the roadâ.
A quantity called the slew rate, which is the rate of change of gradient amplitude is usually quoted in evaluating gradient performance and potential physiological effects (e.g. a maximum slew rate of 200 Tm-1s-1).
DEFINITION of 'Churn Rate'. The percentage of subscribers to a service that discontinue their subscription to that service in a given time period. In order for a company to expand its clientele, its growth rate (i.e. its number of new customers) must exceed its churn rate.REAKING DOWN 'Churn Rate'. For example, if 1 out of every 20 subscribers to a high-speed Internet connection discontinued his or her connection every year, the churn rate for that Internet provider would be 5%.