Statistical Process Control, 6.2 NTMA

Project-Charting and Process Capability

Name ________________________________         Date _________________________

                Part-5A

                Part Desc: Charting and Process Capability

                Quantity Reqd: 1

PLEASE HAVE INSTRUCTOR INITIAL AND DATE AFTER REQUIRED OPERATIONS

                                                                                                          Instructor

Step #              Location                      Description                             Initials                   Date       

    10                        Machine Shop                      Obtain  a set of parts marked

                                                                                SPC.

    20                        Instructor                              Have instructor  assign

                                                                                 Operation.( i.e. Turn 1,

                                                                                Turn 2, Turn 3) . Write in number

                                                                                Under operation on the chart.

30                        Student                                  Indicate Blueprint Specification

                                                on the Chart.

40                        Student                                  Indicate that the measurements

are in 0.001 inches on the chart.

50                        Instructor                              Obtain the correct size SPC micrometer

                                                                            and calibrate it to a gage block or standard.

60                        Instructor                              Indicate the Micrometer has been

calibrated.

   70                         Inspection Area                   Inspect the parts in order and in

subgroups. Code according to the

blueprint specification and record the

measurements on the chart. Read the number

in the .001 position. Do Not Round off.

80                        Inspection Area                   Add the five sizes in each subgroup

                                                                            and write the result in the Total box on

                                                                            the chart.

90                        Inspection Area                   Find the average of each subgroup

                                                                            by multiplying the total of each column

                                                                            by 2. Write in the answer and move the

decimal point one place to the left.

(i.e. –1 X 2 = -2  written as -.2)(see

Figure 15-12, 15-13 in text)

Machine Tool Operations

Statistical Process Control, 6.2 NTMA

Project-Charting and Process Capability

Name ________________________________         Date _________________________

100                          Inspection Area                   Calculate the range for each subgroup.

                                                                                (the difference between the largest and smallest size)                  

                                                                                Write in the Ranges.

110                          Inspection                             Calculate the average of the averages by

                                                                                adding the averages of the subgroups           

                                                                                and dividing them by the number of subgroups.

      =

                                                                                Write in the X  on the chart.

115                          Inspection Area                   Calculate the Average Range by adding the

                                                                                range of each subgroup together and dividing

                                                                                by the number of subgroups.

120                          Inspection Area                   Using the formulas and the constants table

in your text, Calculate the UCL and LCL

averages and write them in the chart.

130                          Inspection Area                   Using the formulas and the constants table

in your text, Calculate the UCL range and

ranges and write them in the chart.

140                          Inspection Area                   Plot the Averages.

150                          Inspection Area                   Plot the Ranges.

160                          Instructor                              Turn in for Grading