Assignment:
Following is a summary of the time study data that was collected during an eight-hour time study on one manufacturing operation on one employee. The entire study took nine-hours because there was a one-hour lunch period in the middle of the day.
You must analyze all the following data, and compute the Total Standard Time to do the job which includes a P, F, and D percentage that you develop based on the following data. Follow the procedure outlined in the Calculating a PFD Allowance Lecture Notes.
You must make the decision on which activities to omit, and which activities to include in each of the following three areas:
1. Personal Time,
2. Fatigue Time, and
3. Delay Time.
You must develop your mathematical answers to the above values using the same format and procedure demonstrated in the lecture posted on the website for this topic.
You must show how you arrived at all your answers using the same type of tables illustrated in the examples on the website.
All the activities in the following example must be shown in your tables for the individual P, F, and D factors (as either included or omitted).
Compute your ratios using an eight-hour work day (480 minutes).
The company has a one-hour lunch period but the company does not pay their employees to eat lunch. Remove the Lunch Hour to yield an 8-hour work day.
The company permits a 15-minute break in the morning and a 15-minute break in the afternoon. The company does pay their employees to take their breaks.
The employee was performance rated at 90% productivity for the entire 8-hour work day. The following times are not factored by this productivity rating. The following times are the actual stopwatch times to do the job. The actual time is shown along with the exact number of parts completed during each time period.
You must determine the average time per part produced and the normal time per part produced.
Compute the total number of parts made during the 8-hour work day. (Example 372 parts)
Compute the total time spent making those parts. (Example 258.3 minutes)
Determine the average time per part by dividing the total time by the total number of parts made. (258.3 / 372 = 0.694 min/part)
Multiply the average time by the rating factor to yield the normal time per part. (Example 0.694 x 1.05 = 0.729 min/part)
Nine-Hour Time Study (Including One Hour Lunch)
|
Activity
|
Minutes
|
|
Turn on machine. Perform start-up checks.
|
1.8
|
|
Complete 112 parts
|
57.9
|
|
Answer cell phone. Talk to spouse.
|
5.5
|
|
Complete 103 parts
|
54.2
|
|
Take morning break
|
15.3
|
|
Adjust feed rate on machine.
|
0.4
|
|
Complete 110 parts
|
57.9
|
|
Get drink of water from water fountain.
|
3.6
|
|
Ask supervisor which batch to process next.
|
2.4
|
|
Wait for next batch to arrive.
|
1.7
|
|
Adjust machine for next batch.
|
1.3
|
|
Complete 71 parts
|
38.2
|
|
Eat Lunch
|
60.7
|
|
Complete 112 parts
|
60.1
|
|
Open box of tissues. Wipe sweat from forehead.
|
0.6
|
|
Visit restroom
|
7.4
|
|
Read for-sale ads on bulletin board.
|
2.8
|
|
Complete 97 parts
|
52.5
|
|
Adjust coolant pressure on machine.
|
0.4
|
|
Take afternoon break.
|
15.2
|
|
Complete 20 parts
|
10.8
|
|
Mechanic replaces broken machine shaft.
|
33.4
|
|
Complete 96 parts
|
53.2
|
|
Turn off machine. Clean up around machine.
|
2.7
|
Use the same format in the Calculating a PFD Allowance lecture notes (i.e., include tables for calculating personal time and delay time) and show your analysis of the above nine-hour time study below. Round Personal, Fatigue, Delay, and Total PFD factor ratios to three decimal places.
Also, include a table labeled Average Time per Part with columns for Number of Parts and Time. Use this table to calculate the average time per part to three decimal places.
Include a proof of your PFD ratio result.