> i have encountered one problem and need to analyzed it before taking
> any preventive action.

> Contorl cable (1/8", 7X19, steel cable) strands wires were found
> broken in the area where it run overs pulleys (phenolic). I have came
> to know that these area are critical to fatigue but couldnt figured
> out the reason and mechanism which led to such damage near pulleys. if
> some one can explain me the propbable causes / reason which can led to
> such occurrences or reasons which can aggravate the situation, so that
> i can based my maintenance procedures and frequency to avoid future
> recurrence.

> hope for a sound engineering / scientific reply from group members.

> thanks

>> i have encountered one problem and need to analyzed it before taking
>> any preventive action.

>> Contorl cable (1/8", 7X19, steel cable) strands wires were found
>> broken in the area where it run overs pulleys (phenolic). I have came
>> to know that these area are critical to fatigue but couldnt figured
>> out the reason and mechanism which led to such damage near pulleys. if
>> some one can explain me the propbable causes / reason which can led to
>> such occurrences or reasons which can aggravate the situation, so that
>> i can based my maintenance procedures and frequency to avoid future
>> recurrence.

>> hope for a sound engineering / scientific reply from group members.

>> thanks

> simple bending fatigue.  try a larger radius on the pulley.  if that's not
> possible, better material/surface finish quality on the cable [strands]
> might help.

> > i have encountered one problem and need to analyzed it before taking
> > any preventive action.

> > Contorl cable (1/8", 7X19, steel cable) strands wires were found
> > broken in the area where it run overs pulleys (phenolic). I have came
> > to know that these area are critical to fatigue but couldnt figured
> > out the reason and mechanism which led to such damage near pulleys. if
> > some one can explain me the propbable causes / reason which can led to
> > such occurrences or reasons which can aggravate the situation, so that
> > i can based my maintenance procedures and frequency to avoid future
> > recurrence.

> > hope for a sound engineering / scientific reply from group members.

> > thanks

> simple bending fatigue.  try a larger radius on the pulley.  if that's
> not possible, better material/surface finish quality on the cable
> [strands] might help.- Hide quoted text -

> - Show quoted text -

>> - Show quoted text -

> well i have checked pulleys as well, in some pulleys i have observed
> cable groove marks in the pulley. however, i have tested the cable
> sample with broken wire strands and their breaking strenght was
> passing the ASTM standard with the exception of one sample that failed
> to qualify the tests.

> Bending loads can cause this problem, but in my case the lap angle on
> the pulleys is around 10-20 degree,which i think can not contribute
> much in my case.

> hope that this new infomartion might help the members in further
> assisting me in correct analysis.

> regards