Wednesday, January 9, 2013
Wednesday, September 26, 2012
Wednesday, September 12, 2012
Friday, September 7, 2012
P chart, C chart, Xbar R chart EOQ demo ..
Chart for Attributes and variables
Feel free to change the values and see how the chart behaves ..
Check out demo of P chart
c chart demo - attributes based SPC charts ..
Xbar and R chart - spreadsheet demo ..
Economic Order Quantity - Total cost curve ..
ge..
Feel free to change the values and see how the chart behaves ..
Check out demo of P chart
c chart demo - attributes based SPC charts ..
Xbar and R chart - spreadsheet demo ..
Economic Order Quantity - Total cost curve ..
ge..
Friday, August 31, 2012
Assignment 2
Assignment 2 (Last date 5 th Sept, 2012..)
1. The MRF tyre company produces tyres for automobiles, trucks. The company wants to establish a quality chart to monitor the production process and maintain its quality.
The company has taken 20 samples (one per day) of 100 tyres per sample, and inspected them for defects, the results of which are as follows.
Sample No. Defectives Sample no. Defectives
1 14 11 18
2 12 12 10
3 9 13 19
4 10 14 20
5 11 15 17
6 7 16 18
7 8 17 18
8 14 18 22
9 16 19 24
10 17 20 23
Construct the appropriate quality chart using 3 sigma limits and describe the variation in the process.
2. A park management wanted to ensure it gives nest service to its customers. It checks the park regularly ans wants to keep the defects throughout the park to less than 10. However, when it did a random inspection of 20 days in previous 3 months, it was found that the defects were distributed as given below.
day / defects - 1/7, 2/14, 3/6, 4/9, 5/12, 6/3, 7/11, 8/7, 9/7, 10/8,11/14,12/12,13/11,14/12,15/9,16/13,17/7,18/15,19/11,20/16
Construct the appropriate conrol chart for this process and indicate if the process was out of control at any point of time.
3. Coca cola bottling company in Bangalore is looking at ways to improve the quality of the bottling process. It has collected samples over 25 days of 5 bottles each, taken at a gap of 1 hour each, to study the accuracy of its bottle filling operation. Mean values of the sample and the range are given in the foll table.
Day / vol in ml,/range in ml
1/201/7 11/204/12 21/210/5
2/199/6 12/210/3 22/218/12
3/204/7 13/203/5 23/206/6
4/201/10 14/207/4 24/211/6
5/200/4 15/206/6 25/223/5
6/195/12 16/208/5
7/202/7 17/209/14
8/202/4 18/215/7
9/200/12 19/210/8
10/201/7 20/207/9
Prepare a X bar R chart and find whether the points are in control. Remove the out of limit points and compute the new control limits.
1. The MRF tyre company produces tyres for automobiles, trucks. The company wants to establish a quality chart to monitor the production process and maintain its quality.
The company has taken 20 samples (one per day) of 100 tyres per sample, and inspected them for defects, the results of which are as follows.
Sample No. Defectives Sample no. Defectives
1 14 11 18
2 12 12 10
3 9 13 19
4 10 14 20
5 11 15 17
6 7 16 18
7 8 17 18
8 14 18 22
9 16 19 24
10 17 20 23
Construct the appropriate quality chart using 3 sigma limits and describe the variation in the process.
2. A park management wanted to ensure it gives nest service to its customers. It checks the park regularly ans wants to keep the defects throughout the park to less than 10. However, when it did a random inspection of 20 days in previous 3 months, it was found that the defects were distributed as given below.
day / defects - 1/7, 2/14, 3/6, 4/9, 5/12, 6/3, 7/11, 8/7, 9/7, 10/8,11/14,12/12,13/11,14/12,15/9,16/13,17/7,18/15,19/11,20/16
Construct the appropriate conrol chart for this process and indicate if the process was out of control at any point of time.
3. Coca cola bottling company in Bangalore is looking at ways to improve the quality of the bottling process. It has collected samples over 25 days of 5 bottles each, taken at a gap of 1 hour each, to study the accuracy of its bottle filling operation. Mean values of the sample and the range are given in the foll table.
Day / vol in ml,/range in ml
1/201/7 11/204/12 21/210/5
2/199/6 12/210/3 22/218/12
3/204/7 13/203/5 23/206/6
4/201/10 14/207/4 24/211/6
5/200/4 15/206/6 25/223/5
6/195/12 16/208/5
7/202/7 17/209/14
8/202/4 18/215/7
9/200/12 19/210/8
10/201/7 20/207/9
Prepare a X bar R chart and find whether the points are in control. Remove the out of limit points and compute the new control limits.
Saturday, July 21, 2012
Assignment I
Last Date of submission is 25 July, 2012, 12 noon.
1. Identify the three major functional areas of business organisations and briefly describe how they interrelate.
2. Differentiate between craft production and mass production. Is Lean Production different from these. How ?
3. List out the ways in which service operations differ from manufacturing/production operations, explain with the help of an example.
4. The following table shows data on the average number of customers processed by several bank service units each day. The hourly wage rate is $25, the over head cost is 1.0 times the labour cost, and the material cost is $5/customer.
Unit Employee Customers processed
A 4 36
B 5 40
C 8 60
D 3 20
a. Compute the labour productivity and multi factor productivity for each unit.
b. Suppose a new, more standardised procedure is to be introduced that will enable each employee to process one additional customer a day, compare the expected labour and multi factor productivity rates for each unit. For multi factor productivity assume an 8 hour day.
5. a. Why is time study and method study carried out in manufacturing environments ? Can we do a time study on a nurse at a hospital, Why ? What is the method adopted there ?
b. The average observed times (OT) of the five elements of a task done by different workers timed for twenty cycles each are as given below.
Task OT,secs Rating
1 9 110
2 12 110
3 7.4 110
4 8.6 100
5 12.5 110
The allowances are 12 % of the normal time. Calculate the standard time. What is the standard output in a shift of 480 minutes ?
6. a. Explain the significance of the process chart symbols used for method study. What is a two handed process chart and a man machine chart ?
b. Draw a process chart for replacing the two old front tyres of an automobile with new tyres in a tyre shop after purchase. What all steps can be eliminated or combined ? Draw the new process chart after analysis.
1. Identify the three major functional areas of business organisations and briefly describe how they interrelate.
2. Differentiate between craft production and mass production. Is Lean Production different from these. How ?
3. List out the ways in which service operations differ from manufacturing/production operations, explain with the help of an example.
4. The following table shows data on the average number of customers processed by several bank service units each day. The hourly wage rate is $25, the over head cost is 1.0 times the labour cost, and the material cost is $5/customer.
Unit Employee Customers processed
A 4 36
B 5 40
C 8 60
D 3 20
a. Compute the labour productivity and multi factor productivity for each unit.
b. Suppose a new, more standardised procedure is to be introduced that will enable each employee to process one additional customer a day, compare the expected labour and multi factor productivity rates for each unit. For multi factor productivity assume an 8 hour day.
5. a. Why is time study and method study carried out in manufacturing environments ? Can we do a time study on a nurse at a hospital, Why ? What is the method adopted there ?
b. The average observed times (OT) of the five elements of a task done by different workers timed for twenty cycles each are as given below.
Task OT,secs Rating
1 9 110
2 12 110
3 7.4 110
4 8.6 100
5 12.5 110
The allowances are 12 % of the normal time. Calculate the standard time. What is the standard output in a shift of 480 minutes ?
6. a. Explain the significance of the process chart symbols used for method study. What is a two handed process chart and a man machine chart ?
b. Draw a process chart for replacing the two old front tyres of an automobile with new tyres in a tyre shop after purchase. What all steps can be eliminated or combined ? Draw the new process chart after analysis.
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