Help with NDC (Number of Distinct Categories) Please

B

breitman

#1
Hi Everyone,

I have to perform gage R&R studies. For some reason, i can not get the ndc where it should be, let alone over 1. I understand that parts needed to be taken over a period of time, which has been done, but our numbers do not differentiat. This has become quite frustrating. :mad: Any advice would be greatly appreciated.
 
Elsmar Forum Sponsor

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#2
Re: Help with NDC Please!!

ndc assumes that you presented to the study the entire range of variation you expect that characteristic to see over the life of the process. Then, it compares the resolution the gage is capable of (with error factored in, not just readability), and determines if there is enough statistically significant resolution. Low ndc usually means there is not enough resolution for the variation presented, or too much error. Not sure which you have.
 
B

Barbara B

#3
I understand that parts needed to be taken over a period of time, which has been done, but our numbers do not differentiat.
This is more a requirement for process capability. To get a clear picture whether your measurement system/process is able to distinguish different parts in the whole area of your characteristic you have to choose different parts. If all parts are similar, ndc will remain 1 - regardless of the measurement uncertainty.
 
Thread starter Similar threads Forum Replies Date
R First Time Managing Calibration and Measurement System. Need Help. General Measurement Device and Calibration Topics 11
M Can someone help me with this CMM programming question? Manufacturing and Related Processes 2
C Need help in determining applicable clause for an audit finding (based on AS9120B) ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 4
M Attempting to Poke Yoke a wire crimping process...need help Design and Development of Products and Processes 3
marmotte Help with Surgical Class I + 510(k) exemption US Food and Drug Administration (FDA) 0
T Help with updating procedures ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 18
P Looking for help with an Ansys Workbench problem Manufacturing and Related Processes 0
C I need your help to find the action plan for these quality objectives Misc. Quality Assurance and Business Systems Related Topics 23
O New metal detector, ccp -help! Food Safety - ISO 22000, HACCP (21 CFR 120) 1
J PFMEA/control plan question- PLEASE HELP ! IATF 16949 - Automotive Quality Systems Standard 8
J Help needed on clauses identification ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 12
S HELP in setting-up QMS Quality Tools, Improvement and Analysis 4
R Need help on calibration result analysis Measurement Uncertainty (MU) 17
S Help in SMART goals AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 8
Vader22 IATF 16949 extended manufacturing site help IATF 16949 - Automotive Quality Systems Standard 4
G Need Help with Run @ Rate for Medical Devices ISO 13485:2016 - Medical Device Quality Management Systems 0
F Need help in IMS management review Management Review Meetings and related Processes 3
A Please Help With EOQ Calculation Manufacturing and Related Processes 2
S Help needed in choosing the method of calculating the minimum sample size Internal Auditing 12
D IATF 16949 Certification and Letter of Conformance expiry (Help!!!) IATF 16949 - Automotive Quality Systems Standard 8
S I need help in corrective action plan Nonconformance and Corrective Action 15
S Help in document control procedure Document Control Systems, Procedures, Forms and Templates 8
D Weird spec sheet - need help Measurement Uncertainty (MU) 3
Edward Reesor ISO 19223 Discussion (Help) Other Medical Device Related Standards 1
J Help to understand and response to API AAR during the re-certification audit Oil and Gas Industry Standards and Regulations 17
S NC and Deviation approach - please help Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 12
K Need Help With Auditing Suppliers Against ISO 9001 ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 50
R Lead auditor scenario (Need help) is this non conforming to ISO13485 Manufacturing and Related Processes 2
J HELP NEEDED ! Risk Management Exercise ISO 14971 - Medical Device Risk Management 12
D Help Me. Non conformitty in External Audit IATF 16949 - Automotive Quality Systems Standard 13
U Need Help With API Q2 Quality Manual Oil and Gas Industry Standards and Regulations 8
A Nonconformity help IATF 16949 - Automotive Quality Systems Standard 5
J ISO 9001:2015 Clause 8.5.1 Control of Production and service provision - Help with Work Instruction Access ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 13
Azaarus Help with CAPA for an IATF finding regarding inspection documentation IATF 16949 - Automotive Quality Systems Standard 10
A Help needed with locating conector Design and Development of Products and Processes 0
Y CER: can "state of the art" help to make up for literature search on equivalant devices? EU Medical Device Regulations 1
D Need some Help on 8D fault tree analysis Problem Solving, Root Cause Fault and Failure Analysis 6
B Can someone help me explain P-Value with a simple word please? Capability, Accuracy and Stability - Processes, Machines, etc. 11
M Help on formulating a LP minimization problem Manufacturing and Related Processes 2
N Help with understanding Process Controls Manufacturing and Related Processes 7
K Screen printing ink and machine selection_ Need help Manufacturing and Related Processes 6
J Need Help with FPY Data in Assembly Process Manufacturing and Related Processes 7
S Need help on "Country of Origin" Medical Device and FDA Regulations and Standards News 0
M Need Help With Information Security Asset Risk Register IEC 27001 - Information Security Management Systems (ISMS) 2
T Help with BS EN ISO - IEC 80079-34 2020 (Explosive atmospheres QMS) Other ISO and International Standards and European Regulations 0
J Help settle a disagreement: Should external providers of preventive maintenance be on your ASL? AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 5
N Help with basic understanding of Competence requirements ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
C ISO/ IEC 17021 Resource requirement (need help) Document Control Systems, Procedures, Forms and Templates 5
D Supplier Quality level category help - high level ISO 13485:2016 - Medical Device Quality Management Systems 6
D Amendment Class II - Please confirm if the submission is by email (Canada) - Help Canada Medical Device Regulations 0

Similar threads

Top Bottom