Question

This problem is similar to Alt-Cat 8.2 and 8.3. An assembly line is to be designed to operate 9.5 hours per day and supply a steady demand of 450 units per day. Here are the tasks and their performance times: PERFORMANCE PRECEDING TASK PERFORMANCE TIME (SECONDS) 25 30 15 10 40 20 PRECEDING TASK TASKS TIME (SECONDS) TASK 56 40 38 15 39 20 h,i j, k b. What is the workstation cycle time? Hint: draw the diagram first. tion cycle timeseconds per unit c. What is the theoretical minimum number of workstations? (Round up your answer to the next whole n inimum number of workstations d. Assign tasks to workstations using the longest operating time. (Leave no cells blank - be certain to enter "O" wherever required.)

Answer 1

(a) The cycle time = time available / no. of units to be produced = 9.5x60 /450 = 1.266 min = 75.96 sec =76 sec.

(b) Theoritical min, number of workstations = task time /cycle time

= sum of time taken by all activities / cycle time = 348 / 76 =4.57 =5

(c)

WS	Tasks	Time	Idle time
I	a,d	71	4.96
II	b,h	70	5.96
III	e,f,i	73	2.96
IV	c,g	64	11.96
V	j,k,l	70	5.96

5 2o 39 yo る