RE: Process Capability - examples?

["Rey" <rrramirez@cantv.net>]

Steven:

Why not try these problems of maintenance with a more appropriate model as
Queueing Theory? Many years ago 1978 I was part of the Venezuela Navy Otomat
Missiles Maintenance Organization  and we attack these problem of
maintenance using this method.

See below two personal opinion.  Not doubt this is a Markovian Model where
it may be used the Red Bead Experiment in combination with the queueing
theory..

First - there were a large number of torpedo engines waiting to be
cleaned, and a large number of torpedoes stalled in the process waiting
for engines.  Come to find out, at the 110 person facility, only two
sailors were qualified to clean engines, and they were the two most
junior sailors.  Cleaning engines was a dirty job no one wanted to do.
If either of the two were away on other tasks, engines didn't get
cleaned.  Several more senior sailors were then made to enjoy this task.

This IS A PROBLEM OF UNBALANCED LINES OF MAINTANANCE (Queueing Theory) 
Waiting (in maintenance) normally is a consequence of unbalanced lines
(example:more
Torpedos than lines  or enough lines but not tools or not qualified
personnel, etc.) 


Second - we had four automated test lines to test the torpedoes at the
end of the process.  The technicians were very proud of their equipment,
and if any line went down, they were there all hours of the night and
weekend to repair the line.  They kept logs of the lines status.  Review
of the logs showed that, even taking into consideration downtime for
preventive maintenance, one of the four lines was ALWAYS idle.  Even if
we hit 10 torpedoes a week, it looked like one line would be idle.  I
convinced the commanding officer that one line was an installed spare.
If one went down, don't worry, don't do anything heroic to fix it.  Yes,
fix it, but no heroics.  But if a second line went down we were in
trouble.  Yes, some of the folks dedicated to the test lines learned how
to clean engines.


This(the always idle lines)is a consequence of the unbalanced lines of
maintance

My best regards and best wishes for a merry christmas and happy new year

CMDR (Venezuelan Navy) Reinaldo Ramirez Dala
Caracas, Venezuela.