Homework Week 1

Chapter 5

8.

a) What is the possible daily out of this process if 8 hours of processing time is available each day?

It takes 38 seconds at station a so it's our longest station, so I took 60 sec. x 60 min. x 8 hrs./38 seconds and came up with 757.8947 or 757.9 products per 8 hr. shift or 94.73 products per hour.

b) Given your output rate in part a, what is the efficiency of the process?

Efficiency = actual output/standard output

So 167 seconds/ 263 seconds = .6349 or .63

c) What is the flow time of the process?

Since abc and jkl are parallel I will take the longer times of the two stations which ends up being abc. So I add up a,b,c,x,y,z and come up with 167. Next I take 60 seconds times 60 minutes times 8 hours and divide by the 167.

60x60x8/167= 172.45508 or 172

Chapter 6

1. What type of process flow structure is CBF using?

Manufacturing cell. CBF was designed to run 1000 boards per day when running 5 days a week and one eight hour shift per day. On the Product-Process Matrix we can see that manufacturing cell is closely tied in with the assembly line and they are both designed for a high-standardized commodity product with high volume.

2. Diagram the process in a manner similar to Exhibit 6.7.

My excel will not load for some reason, so I'm trying it via word pad.

Order acceptance ->Machine programming ->Board fabrication -> load (5minutes, and .33 minutes) -> clean (.5 minutes) -> coat (.5 minutes) -> unload (.33 minutes) -> expose (15 minutes, and 1.72 minutes) -> load (5 minutes, and .33 minutes) -> develop (.33 minutes) -> inspect (.5 minutes) -> bake (.33 minutes) -> unload ( .33 minutes) -> drilling ( 15 minutes, and 1.5 minutes) -> copper plate (5 minutes, and .2 minutes) -> final test (15 minutes, and 2.69 minutes)

3. Analyze the capacity of the process.

CBF capacity process doesn't appear to be running efficiently. For example during the process/machine phase you have a machine for the clean time you are wasting time because you don't have an employee to manually load them into the machine. Another area of concern is the drilling because you have 6 machines but only 3 employees, and this process take around 15 minutes per job.

4. What is the impact of losses in the process in Inspection and Final Test?

During the inspection phase 15 percent of the boards are typically rejected, and during