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View Full Version : Capability and Stability - Process, Machine, etc.


  1. Ppk vs Cpk - A Good, clear explanation and How Mini-Tab Handles Certain Statistics
  2. A Cpk Brief - Don Winton Contribution
  3. Questions on use of SPC, Ppk, Cpk during PPAP
  4. Ppk - Capability calculation using the estimated sigma calculated from the Rbar/d2
  5. What are the benefits pursued with the revision of CP when Process cpk >=3?
  6. SPC and GD&T - Machined parts - Is Cpk is the correct index?
  7. More GD&T - We can't compute Cpk using GD&T
  8. Ppk or Cpk - Preliminary Process Capability vs. Process Performance
  9. What is the difference between Ppk and Cpk
  10. On-going capability - Can we decide for ourselves how often to measure cpk?
  11. Combining high Cpk (3, 4 or 5) with a set of XR charts
  12. Cp & Cpk - How are you calculating the standard deviation?
  13. Cpk for one sided dimension - GD&T true position
  14. Calculating Defect Rate (PPM) from a Cpk value
  15. PPAP Rev 3 Cpk/Ppk - Bulk Suppliers - Aluminum, ingot, coil
  16. Capability Studies - Fewest Number of Parts for a Capability Study
  17. Process monitoring of portable & stationary oxygen units: Can we use Cpk, Ppk, SPC ?
  18. Going for QS Cert but not ALL processes are at Cpk 1.33
  19. Determining Cpk on a single sided tolerance dimension
  20. Can I calculate Cpk from Cp and Cr?
  21. Cpk and Ppk calculations for QS-9000 TE (Tooling and Equipment) Requirements
  22. Increased positional tol. due to departure from MMC (Bonus)and calculation of Ppk/Cpk
  23. Cpk's for five different dimensions on castings
  24. Cpk or Ppk in packaging closure manufacturing?
  25. Using Cpk for the purpose of determining sample size/frequencies
  26. Any ideas on setting up Capability study spreadsheet in Excel?(CPK/CMK formulae)
  27. Cpk on Profile - Is it possible to a Cpk study on a profile? GD&T perspective
  28. How do I calculate the percentage of errors, when I know min, max, mean, cp and CPK
  29. Cpk higher than Cp - Explain the relationship and why this happens?
  30. Capability index for one-sided specification? Cpk(max) = (USL-Xbar)/3*s ??
  31. Is there any relationship between Cpk & Right First Time? First Pass Yield (FPY)?
  32. Cpk value interpretation - What is the significance of Cpk value of 1.33?
  33. Cp and Cpk - Cpk is an index that should be applied to a stable process
  34. Cpk, cómo calcularlo?
  35. High Cpk's and Control Charts - Is it justified to stop using control charts?
  36. What causes Ppk to be greater than Cpk when a basic capability analysis is run?
  37. Calculating Cp and Cpk on a Non-Normal Distribution
  38. Cpk Vs DPM (Defects Per Million {aka PPM})
  39. Cp/Cpk vs Pp/Ppk (Short term using population sigma) - Formulas to use?
  40. Short Run - Low Volume Cpk Calculation
  41. Process Standard deviations and equivalence of Cp & Cpk
  42. Cpk for Individual Chart
  43. Cpk calculation for short runs - Manufacturing FFC (flexible flat cable)
  44. Cp, Cpk calculation for np chart - No USL or LSL - SMT Production
  45. Reducing gaging frequency/High Cpk
  46. Need help / feedback on Xbar/R charts and Cpk/Ppk applicability - Assemblies
  47. Oddities of Cpk - Chicken parts
  48. Attribute Charting - Where does Cp and Cpk come into the equation?
  49. Using Cpk index for Accept / Reject Decisions
  50. Cpk, Cmk in electronic assembly
  51. Calculating the RFT using the Cpk value
  52. Cp and Cpk for Product with only LSL (Lower Specification Limit)
  53. What is the Formula for Cpk in Excel?
  54. Capability: Short Term or Long Term? Cpk= Long term and Ppk= Short term?
  55. Calculating Cpk on a single sided (unilateral) tolerance
  56. Cmk and Cpk - When will we need to calculate Cmk? Machine Capability
  57. How do I calculate Cpk with a single Control Limit?
  58. Cpk vs. Ppk - Long Term vs. Short Term - Capability vs. Stability
  59. How much does Cpk > 1.33 represent in precentage of good pieces?
  60. Tolerancing based on Cpk Data - Spreadsheet Attached
  61. Is it possible to determine the Cpk value from Cp and Cr values?
  62. Cp, Cpk, Sp, Spk for a one-sided minimum specification
  63. Pp and Ppk indices - Is it statistically possible to have a Ppk greater than Pp?
  64. Evaluating software that measures Ppk, Cmk, Cpk, PPI, etc.
  65. Control Chart CpK dilemma - Defect Per Unit data on a single production line
  66. When to use Ppk/Pp and Cpk/Cp - Difference between population and sample
  67. What is the 'k' in Cpk?
  68. Ppk and Pp on unilateral or unequal tolerance - DCx says Pp can not be calculated
  69. SPC on Wave soldering machine - Cp and Cpk analysis - Soldering pot temperature
  70. Training tools wanted for CPK and PPK
  71. Software Calculation Errors for Cp and Cpk With Unilateral Tolerances
  72. Cpk Formula: Am I using it correctly? Excel .xls Spreadsheet form
  73. Which should be decided first : Cpk or all equipment/technician GRR
  74. Ppk formula - Can some one please help me - I have attached the sheet.
  75. Cpk analysis for +.000/-.004 problem
  76. Ppk - Seeking short-term study examples - Chronically unstable processes
  77. Is Cpk a good measure of capability? There are several shortcomings of Cpk
  78. If there is no demands of (Cpk etc) limits on SC at PPAP?
  79. Capability study - What Values do I have to input to calculate Cp and Cpk
  80. Cpk - Relation between measurements and resulting tolerances - Trimming resistors
  81. Evaluating Process Stability - Unstable Processes - Cpk/Ppk?
  82. Is there a Cpk requirement for automotive industry stated in TS16949?
  83. Could anyone tell me what is relation / difference in Cpk and Ppk
  84. Is it possible to have a process that is too good? Cpk is 14.63
  85. Seeking a Cpk vs z vs Pz Table
  86. Cpk's, specifications and tiny sd's - Resolution of measurement equipment
  87. Some questions about Cmk and Cpk
  88. Does anyone know the conception of "Plant Cpk average"?
  89. SPC Terminoloy & Jargon: Cpk, Ppk etc.: How did it evolve?
  90. Attribute capability indices - Cpk and/or Ppk value for an attribute type of feature
  91. Spc Question - When the Cpk value is bigger than 2.0
  92. What is the formula I need to calculate Pp and Ppk?
  93. Is Cpm (Taguchi's Index) Superior to Cpk and Ppk?
  94. Cpk for 3D data - Capability study from CMM data- Need Help
  95. What is the difference between Cp, Cpk and Ppk?
  96. The Formulas of Ppk and Cpk in VDA4.1
  97. Rp with a 1.33 min Cpk (Rp?) - Anyone know what Rp represents?
  98. Cpk computation for Skewed Distribution
  99. What should be the best control chart? Cpk study for assembly length
  100. AIAG PPAP requirement on Cpk
  101. Calculating Cpk/Ppk Simultaneously in SPC software
  102. Analysis of Ppk data and calculations
  103. TPPS ( torque process potential study) - How to & need Excel .xls Spreadsheet
  104. Experience with DOE in machine capability study
  105. Capabilty & samples - Why do we use a d2 (of 2.326) for a sample of 5 parts
  106. What is the meaning of "k" in Cpk and Ppk? And Cpk vs. Ppk
  107. Process Capability - Bilateral vs. Unilateral Tolerances
  108. Is it possible to get a negative Cpk value?
  109. Which system of inspection will be better attribute type or the variable type?
  110. Process capability for blended fluids? PPAP book section 1.2.2.9.1, page 6
  111. Need a help in finding a research paper - Patel, J. K. (1986) Tolerance interval
  112. Capability studies in Process Plants - E-coat of galvanized flat carbon steel coils
  113. P-value is 0.05 - Normal or non-normal data?
  114. Low Process Capability - Cpk - Man-made part - What to do?
  115. What is the value of Cpk for a new process?
  116. Is a machine capability the right thing to do Next? Laser measuring machine
  117. Tolerance intervals - Asked to provide a tolerance for a manufacturing process
  118. Confused about the machine capability index Cmk
  119. Tensile made critical characteristic, but Cpk? High rate of rejection in a part
  120. Process Capability Data (TS16949 8.2.3.1) - How often should it be reviewed?
  121. Ppk/Cpk for geometrical true position of hole with MMC
  122. Calcuating a one sided (LSL) Cpk for Proccess Capability
  123. Charting Bi, Tri or More Modal Distributions to combine results from two machines
  124. Differences between Machine Capability and Product Capability studies
  125. Excel formula for Ppk needed
  126. Ppk sampling method - Does data for Ppk have to been continuous?
  127. Analysis of non-normal stratified data for cpk/ppk? Rupture test
  128. Process capability or Process control - Which comes first?
  129. Use of an outlier in calculating Cpk/Ppk
  130. Necessary to Write a Process Capability Procedure? ISO9001
  131. Machine Capability vs. Process Capability - Differences?
  132. Ppk of non-normal bounded proccess, one sided specification
  133. Can CPK be a good manufacturing processor’s quality objective?
  134. Process Control - Force in compression moulding of rubber keypads
  135. Cp vs. Cpk - A Visual Animation and Related Discussion Threads
  136. Definition of Special Characteristics Delta C and Delta S - Need for Customer Audit
  137. Quality Control Index - We thought that Cpk or Ppk would be good choices
  138. How do you identify your heat treat capability study samples?
  139. Machine short term capability study with Cmk index in automotive industry
  140. Reason for pre-production machine/process capability studies / SPC during production
  141. When do you reduce SPC sampling? And How?
  142. Real life example of the difference between Cpk and Ppk
  143. Capability Study for Radii of laser cut pockets - 0.030" radius
  144. A question about Cpk and Cmk - Can we use Cpk to replace Cmk?
  145. Cpk Help needed - Explain to me where I made a mistake
  146. Customer is telling me my Cpk calculation is incorrect
  147. How to compare Cpk and ppm (bad pieces)
  148. Is it acceptable to use S bar to compute CPK?
  149. What is the difference between UCL, LCL and Cp, Cpk
  150. Using Pin Gages as a Measurement Tool for Ppk/Cpk studies
  151. Sub Group Size of 1 or 5 - Is there a difference in the Long run?
  152. Cp and Cpk for Dispenser product
  153. Process Capability Training Exercise
  154. Composite Process Capability Index - Cpk is not additive
  155. Process capability worksheet - how to create the Bell Curve?
  156. What Capability Index should I use? SMT Application
  157. Pre Production Parts Sampling for Cpk
  158. Which SDLC (Systems Development Life Cycle) phase does Quality Assurance Participate
  159. How can I calculate Cp & Cpk and make a control chart for maintenance activities?
  160. What Tool(s) to Use to Create a Cpk Chart from Data
  161. Cp, Cpk, Dpm, or other? Diameter of a Hole - Non-Normal Distribution
  162. Upper and Lower Limit Calculation with Capability Formula - Product Weight
  163. Capability Study Template
  164. Moving Range Average Calculation in Excel (in a single cell only).
  165. Capability Study on Extruded Alumin(i)um - How would one define a "batch"?
  166. Time Study Std/Books that define minimum requirements for conducting time study?
  167. Process that is Not Stable vs. Not Statistically Capable - Differences
  168. Validation of Stability Testing for Sutures
  169. Measuring Capability on a One Sided Variable (Surface Finish)
  170. Calculation/math to find 1.33 Cpk
  171. Cpk and MSA study for Chemical Production Line
  172. What does a Process Capability Index of greater than 1 suggest?
  173. Accelerated Stability Studies - Duration and Conditions - Class III Medical Device
  174. Small Lot, Large Part Run Chart - Expressing Cp / Cpk
  175. Fastener Sorting Capability
  176. Cpk Studies for Concentricity - Dimension that is spec'd 0.0 - .03
  177. Small Lot Sizes - 30 a month - Cpk - Very large fabrication
  178. Capability Study on Attribute Data? Visual Inspection
  179. Suitability and Capability of Measurement Equipment
  180. Cmk (Machine Capability) - Case study
  181. Why is Cpk = lower of (USL-Xbar)/3sig & (Xbar-LSL)/3sig ?
  182. Updated Gage R&R Excel Forms
  183. How to calculate the capability when the tool life is low
  184. XRF Capabilities - Correlating 2 different XRF machines - Ni/Au parts
  185. Process Capability on go / no-go gage?
  186. Assumptions with Small Sample Sizes