# Cmk - What is the difference between an R&R study and Cmk?

K

#### Kimkolora Pen

hello every one,

i am an enginnering student , i want to know what is the Cmk, and wht is the difference between the R&R study and the Cmk? because i am doing my report for my school, i am completely lost.

Regards, kim

#### SteelMaiden

##### Super Moderator
Super Moderator
I am not a guru, but Cmk is machine capability, Cpk is process capability. Can't tell you what all the formulas are (at least not without digging through a bunch of old paperwork), but that is how the differences were explained to me.

R

#### Rick Goodson

Kim,

I am not familiar with the term 'Cmk'? Where did you see this term and how was it used? Could it possible have been 'Cpk'? If so, I can help explain the relationship of Cpk and R&R Studies.

Calibration or Verification -> Cm and Cmk, etc. Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 3
How is the Cmk and Cpk calculated? Statistical Analysis Tools, Techniques and SPC 0
Function in french called "numbre de posage(s)" - CMK Question Quality Tools, Improvement and Analysis 3
Excel Spreadsheet Template to calculate Cmk (Machine Capability) wanted Capability, Accuracy and Stability - Processes, Machines, etc. 2
Q Machine Capability Study - Cpk (Cmk) of an R/F testing machine Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
L Fastening Process Cmk study - Bolt Torque Statistical Analysis Tools, Techniques and SPC 1
L Multi-fixtures in one CNC lathe - How to do Cmk study? Statistical Analysis Tools, Techniques and SPC 6
F MCA calculation - problem with Cm Cmk and boundaries Capability, Accuracy and Stability - Processes, Machines, etc. 1
M Cmk (Machine Capability) - Case study Capability, Accuracy and Stability - Processes, Machines, etc. 5
C Gauge R&R Studies Bad, but Process has a Cmk of over 7 IATF 16949 - Automotive Quality Systems Standard 8
S A question about Cpk and Cmk - Can we use Cpk to replace Cmk? Capability, Accuracy and Stability - Processes, Machines, etc. 1
V Machine short term capability study with Cmk index in automotive industry Capability, Accuracy and Stability - Processes, Machines, etc. 3
Q Confused about the machine capability index Cmk Capability, Accuracy and Stability - Processes, Machines, etc. 1
D Tool Approval Process - Should we be using Cmk for tool validation Statistical Analysis Tools, Techniques and SPC 2
A Acceptance criteria for Cmk (machine capability index) Statistical Analysis Tools, Techniques and SPC 3
H Some questions about Cmk and Cpk Capability, Accuracy and Stability - Processes, Machines, etc. 2
I am confused, which Cmk value should I take and use? Statistical Analysis Tools, Techniques and SPC 6
M How to Conduct a Machine Capability (Cmk) Study Statistical Analysis Tools, Techniques and SPC 26
C Evaluating software that measures Ppk, Cmk, Cpk, PPI, etc. Capability, Accuracy and Stability - Processes, Machines, etc. 4
S Cmk and Cpk - When will we need to calculate Cmk? Machine Capability Capability, Accuracy and Stability - Processes, Machines, etc. 4
A Cpk, Cmk in Electronic Assembly (Process Capabiity) Capability, Accuracy and Stability - Processes, Machines, etc. 4
S Cmk is defined as a Capability Index for a Stable Machine Capability, Accuracy and Stability - Processes, Machines, etc. 8
B Any ideas on setting up Capability Study spreadsheet in Excel? (CPK/CMK formulae) Excel .xls Spreadsheet Templates and Tools 4
D Can anyone enlighten me as to what exactly Cm / Cmk are? Statistical Analysis Tools, Techniques and SPC 1
M Cmk calculation - Small plastic parts using injection-moulding machine Statistical Analysis Tools, Techniques and SPC 2
What is the difference between Design Process, Process Design and Design Control? 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
Labeling difference for storage and operating conditions EU Medical Device Regulations 1
What's the major difference between Green Belt and Black Belt in term of training and project Six Sigma 3
Difference between a subcontractor and a supplier ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 21
Difference between Stainless Steel 316 ASTM F899 and ASTM A276 Other Medical Device Related Standards 3
Exact terms for a plating failure and difference between rejection rate and failure rate Manufacturing and Related Processes 9
Difference between MSA and MSE? General Measurement Device and Calibration Topics 1
What is the difference between discrete and continuous variables? Problem Solving, Root Cause Fault and Failure Analysis 5
Difference between Approval and Registration - ISO 13485:2016 ISO 13485:2016 - Medical Device Quality Management Systems 2
Difference between EU-MDR Annex IX and the Annex-combo X&XI EU Medical Device Regulations 2
ISO 17025:2017 Clause 4.2.2 - The difference between "be notified" and "be informed" ISO 17025 related Discussions 4
The Difference of being AS 9100D Compliant vs.Certified AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 13
What is the difference between Error Proofing and Controls? ISO/IATF 16949 - Control Plans FMEA and Control Plans 16
IEC 60601-1-8, difference between table 4 and annex D IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
What is the difference between Basic UDI-DI and UDI-DI? EU Medical Device Regulations 6
What is the difference between AS9100D 9.3.2.f and 9.3.3.a AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 8
Aluminum - What is the difference between 6061-T6 and 6061-T651 (both per ASTM B211)? Manufacturing and Related Processes 4
The difference b/w FMEA & Risk analysis as per iso 14971 ISO 14971 - Medical Device Risk Management 8
What is the exact difference between Risk and Opportunity in context of ISO 27001? IEC 27001 - Information Security Management Systems (ISMS) 7
Difference between Surface Finish (Ra) and Flatness (GD&T) Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
Air Flow - Which is the operational difference between LAF (vertical and horizontal) and RLAF? Manufacturing and Related Processes 2
What the difference is between Stub Acme & Acme thread? Oil and Gas Industry Standards and Regulations 1
DO 178B - What is the difference between review and verification? Federal Aviation Administration (FAA) Standards and Requirements 1
The difference between SOP and Kaizen Standardization Lean in Manufacturing and Service Industries 2
Difference between intended purpose and intended use of the device EU Medical Device Regulations 9