Suppose typical 0, R-charts arc kept for a parts machined on a lathe. How would

Question

Suppose typical 0, R-charts arc kept for a parts machined on a lathe. How would the wearing out of the tool bit most likely show up on the x-chart? a run a point below the LCL a trend a cycle none of the above Suppose a process is really in control and a sample point on the range chart is above the This causes a search to begin for an assignable cause. This situation is an example of: a) a Type II error b) Type I error how SPC finds assignable causes a process that is not capable none of the above v Suppose an assembly line produces anywhere from 100 to 300 parts per day. The number of units that fail the functional test and must be scrapped is recorded at the end of the day. What kind of SPC chart would be most appropriate for tracking this data? p-chart np-chart 0, R-chart 0. R-chart u-chart none of the above Suppose a process has a C_p=1.0 and a measurability study shows that the P/T ratio is 0.55. Which of the following assessments is the most appropriate? Both the process and the measurement system are capable The variation among operators doing the measurement is excessive The measurement system is not adequate and the process capability is not certain The measurement gages need to be replaced e) all of the above An individuals chart is commonly used when: large subgroups are expensive data is collected automatically a process variable is being measured (eg. flow rate, temperature, etc) data is infrequent all of the above The trend today is for customers to demand that their suppliers: perform 100% inspection to insure perfect quality strive to make all their processes capable and in-control force workers to do a better job the first time bury the cost of scrap in the cost of the good product none of the above

Explanation / Answer

1. c) a trend.

because a trend would imply that after some time the points will be either above UCL or below LCL and it would continue to happen so. hence that would indicate the wearing out of the tool

2. c) how SPC finds assignable causes

we know due to the presense of assignable causes a process deviates fom its initial state

so here the initial state is that the process is in control. but one point falls above UCL which means that the process has deviated from its initial state. hence there is some assignable causes

3. b) np chart

because only np chart out of the mentioned charts denote the number of defective units

and here we need to count the number of units that fail the functional test

hence np chart is appropriate

5. e) all of the above

because all the points mentioned in the options are important.

for large subgroups to be expensive it is not possible to incorporate all so a individual chart is done

if data is collected automatically and data is infrequent then there is no control on data.

hence individual chart is done

4. a) both the process and measurement system is capable

since Cp=1 the process is capable and since P/T<1 which means 6*sigma<(UCL-LCL)

hence the most of the points fall within UCL and LCL

hence measurement system is also capable

6. d) bury the cost of scrap in the cost of the good product

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