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 slew. 1  transitive verb. 2  1 : to turn (as a telescope or a ship's spar) about a fixed point that is usually the axis. 3  2 : to cause to skid : veer slew a car around a turn.  intransitive 1  verb. 1 : to turn, twist, or swing about : pivot.  2 : skid.