Question

A pipe bending machine used to produce ship system components was operated as follows:

• The period of operation was 25 days @ 10 hrs per day.
• It produced 800 total pipe details, of which 40 were rejected by quality inspectors.
• The total setup time for the machine during the 25 days was 22 hours.
• The machine had 3 unplanned breakdown events
  • 1.5 hours for a power failure
  • 0.5 hours for computer network failure
  • 2.2 hours for lubricant pump failure
• The theoretical cycle time for the parts averages 10 minutes per part.
• 30 minutes of planned downtime was experienced when workers attended a Labor Union Meeting

         a. What is the overall equipment efficiency (OEE) value? (show work)

         b. What are the quality; performance, and availability rates? (show work)

         c. Between Availability, Quality and Performance, which measure would you

             prioritize when beginning improvement efforts?

2. Use the “positional weight heuristic” to determine the line balance for the following tasks. Positional weight is the sum of process time + # of following tasks. The largest positional weight gets preference when multiple tasks are eligible. The example in the lecture used the “greatest number of following tasks” heuristic.

The takt time for this process is 18 seconds (in our example we calculated this but I am giving it to you here)

Task	Duration (s)	Precedence
A	5	-
B	4	A, E
C	2	-
D	10	E
E	5	-
F	3	C, D
G	5	H, I
H	7	-
I	8	-
J	4	B, F, G

  

1. Determine the precedence diagram and determine a line balance solution with the largest positional weight heuristic. Show your result in a format similar to the example we did, where the assignment of tasks to each work station is clear.

          2. Determine the total idle time, the lead time, and the work-in-process:

Answer 1

Answer factos Avarlabity, Peafeman, and Haly Avarlablthy fs the tals tnto actount the unplanned and plannes bppags Avarlablrty Run Tme / plan Part t.e, tl6 h fe | Performance PR S5.5%

cbeated or dme t the paass 0.95% 50.65 FoY Pmpovement Pn the above mentfaned case, o the eautment as there fe a huge Scope fr