A component used as a part of a power transmission unit is manufactured using a lathe....

 

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A component used as a part of a power transmission unit is manufactured using a lathe. Twenty samples, each of five components, are taken at half-hourly intervals. For the most critical dimension, the process mean is found to be 3.5000 cm, with a normal distribution of the results about the mean, and a mean sample range (R) of 0.0007 cm, (a) Use this information to set up suitable control charts. (b) If the specified tolerance is 3.498-3.502 cm, what is your reaction? Would you consider any action necessary? (c) The following table shows the operator's results over the day. The measurements were taken using a comparator set to 3.500 cm and are shown in units of 0.001 cm. The means and ranges have been added to the results. What is your interpretation of these results? Do you have any comments on the process and/or the operator? Record of results recorded from the lathe operation Time 1 7.30 0.2 7.35 0.2 8.00 0.2 -0.2 8.30 -0.2 9.00 -0.3 9.05 -0.1 2 11.00 0.6 0.4 11.30 12.00 0.5 0.1 Lunch 12.45 -0.5 13.15 0.3 6000 23 3 Machine stopped tool clamp readjusted 10.30 -0.2 -0.2 0.4 0.4 xxx -0.1 0.4 0.2 -0.2 0.1 -0.2 0.3 -0.1 -0.3 Reset tool by 0.15cm 13.20 -0.6 0.2 13.50 0.4 -0.1 14.20 0.0 -0.3 0.3 -0.3 -0.1 0.3 0.4 0.1 -0.4 -0.5 -0.5 -0.2 -0.5 4 0.3 0.2 14.35 Batch finished - machine reset i 16.15 1.3 1.7 2.1 0.2 0.6 -0.1 -0.2 6 -0.2 0.1 -0.5 -0.1 0.2 0.2 Banor 0.2 0.2 -0.2 -0.6 -0.1 1.4 -0.6 -0.2 0.0 0.1 0.5 0.3 0.2 0.0 0.1 -0.2 Mean 1.6 Range 0.32 0.20 0.2 -0.06 0.5 0.02 oooooo 0,3 -0.2 -0.14 -0.2 -0.10 0.4 0.10 25674 -0.26 0.7 1.62 0.6 -0.36 0.4 -0.16 1.0 0.14 0.8 0.22 0.7 0.02 0.6 0.3 0.10 1.1 0.0 0.08 0.6 0.8 0.9 0.7 0.8 A component used as a part of a power transmission unit is manufactured using a lathe. Twenty samples, each of five components, are taken at half-hourly intervals. For the most critical dimension, the process mean is found to be 3.5000 cm, with a normal distribution of the results about the mean, and a mean sample range (R) of 0.0007 cm, (a) Use this information to set up suitable control charts. (b) If the specified tolerance is 3.498-3.502 cm, what is your reaction? Would you consider any action necessary? (c) The following table shows the operator's results over the day. The measurements were taken using a comparator set to 3.500 cm and are shown in units of 0.001 cm. The means and ranges have been added to the results. What is your interpretation of these results? Do you have any comments on the process and/or the operator? Record of results recorded from the lathe operation Time 1 7.30 0.2 7.35 0.2 8.00 0.2 -0.2 8.30 -0.2 9.00 -0.3 9.05 -0.1 2 11.00 0.6 0.4 11.30 12.00 0.5 0.1 Lunch 12.45 -0.5 13.15 0.3 6000 23 3 Machine stopped tool clamp readjusted 10.30 -0.2 -0.2 0.4 0.4 xxx -0.1 0.4 0.2 -0.2 0.1 -0.2 0.3 -0.1 -0.3 Reset tool by 0.15cm 13.20 -0.6 0.2 13.50 0.4 -0.1 14.20 0.0 -0.3 0.3 -0.3 -0.1 0.3 0.4 0.1 -0.4 -0.5 -0.5 -0.2 -0.5 4 0.3 0.2 14.35 Batch finished - machine reset i 16.15 1.3 1.7 2.1 0.2 0.6 -0.1 -0.2 6 -0.2 0.1 -0.5 -0.1 0.2 0.2 Banor 0.2 0.2 -0.2 -0.6 -0.1 1.4 -0.6 -0.2 0.0 0.1 0.5 0.3 0.2 0.0 0.1 -0.2 Mean 1.6 Range 0.32 0.20 0.2 -0.06 0.5 0.02 oooooo 0,3 -0.2 -0.14 -0.2 -0.10 0.4 0.10 25674 -0.26 0.7 1.62 0.6 -0.36 0.4 -0.16 1.0 0.14 0.8 0.22 0.7 0.02 0.6 0.3 0.10 1.1 0.0 0.08 0.6 0.8 0.9 0.7 0.8

Answer rating: 100% (QA)

It looks like youve shared a quality control record sheet for a machining process where a component is being manufactured to a specific mean dimension of 3500 cm with a normal distribution The measure... View the full answer