Define Workstation cycle time. b. Define Assembly-line balancing. c. Define Prec

Question

Define Workstation cycle time.
b. Define Assembly-line balancing.
c. Define Precedence relationship.
d. Given 7.2 hours production time per day; 350 hydraulic actuators required per day; with the following assembly steps and times for assembly of a hydraulic actuator:
1. 15 seconds
2. 35 seconds
3. 20 seconds
4. 10 seconds
5. 15 seconds
6. 35 seconds
7. 40 seconds
8. 50 seconds
e. Determine workstation cycle time.
f. Determine theoretical minimum number of workstations required.
g. How efficient is your assembly line?

Explanation / Answer

Workstation cycle time- In a paced line, the cycle time is often meant to be the amount of time it takes before the product leaves a workstation and moves to the next one in the line. By this definition, the cycle time is the same for all workstations in the line. However, this definition is often too restrictive: in many real lines, it is desirable to have a certain “reserve” of time at the workstations at the end of the line, so that possible perturbations (e.g. equipment downtime) can be absorbed easily by those workstations. Assembly-line balancing- Assigning numbers of operators or machines to each operation of an assembly line so as to meet the required production rate with a minimum of idle time. Precedence relationship- A precedence relationship defines the time-based dependency between events or tasks...or...The order in which tasks must be performed in the assembly process. e. The total cycle time is 215 seconds and the average time per station is about 27 seconds. The workstation-cycle time is equal to the time it is at each station until the actuator can move on; therefore, station 1 = 15 seconds, station 2 = 35 seconds, etc. f. The total time in seconds for the entire work day is 7.2h*3600sec/h = 25920 seconds. Using this info, we can figure out that one machine can produce ((25950 seconds in a day)/(215 seconds {time to produce an actuator})) = 120.70 = 120 actuators per day (rounded down assuming that production does not carry over to the next day). From here we can determine that 350 (actuators needed)/120 (actuators produced per workstation in a day) = 2.92 = 3 workstations (rounded up because you can't have a fractional workstation). g. The assembly line is not very efficient because there are many stations that will get backed up throughout the assembly line. For exammple, station 2 will not be able to keep up with station 1 because it can only work at a pace of 35 seconds while station 1 can work at a pace of 15 seconds. Due to this fact, station 2 will have a little more than two actuators to work on after each iteraton of its cycle. since this deterence happens frequently throughout the assembly line, it would not be considered efficient.

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.