Performing a Gage R and R with No Specification Range

D

duck5

#1
Hi all,

I am used to doing G r and R but always I have been using a specification range and therefore getting the % error of the spec.

In this case I have no specification. Basically we are doing some work on liver tissue and we want to see how accurate our measurement technique is. We have the number of operators, samples and distinct categories but we have no spec. Essentially we don't need one, we just nee to make sure we can can measure the cut depth on a piece of tissue.

Any recommendations for this one? I am thinking of making up a spec range based on what depths we are getting but this will skew my data as the % error will be incorrect.
 
Elsmar Forum Sponsor

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#2
You are not required to have a specification range to perform a gage R&R. %TV can be calculated based on the variation you present to the study (interpreted as the PV). My recommendation is to present as much variation as you expect to see (even if you have to fabricate come of the outer range) to get the most meaningful results.

Is the test destructive? Is there any impact on measuring the same spot each time? If not, be sure to do so. Identify a location and have each operator measure the same location.
 
Last edited:

Miner

Forum Moderator
Leader
Admin
#3
Also, depending on your end goal, you may not even need a %TV metric as much as knowing the pure repeatability & reproducibility expressed as a standard deviation. You might also want to check my blog for the article on Wheeler's methods, which includes a metric called PME, which is the Probable Measurement Error of a single measurement.
 
D

duck5

#4
Thanks all for your responses. It looks like I do not need a tolerance as mentioned. I shall be looking at my total % error
 
Thread starter Similar threads Forum Replies Date
B Performing a Gage R&R Study with Minitab 13 Using Minitab Software 5
J 5.15 or 6 Sigma? What multiplier to use when performing a Gage R&R Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
A Performing Ring Gage Calibration General Measurement Device and Calibration Topics 5
E Performing a GRR when you get multiple readings over time per part. Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
C Performing Additional Inspections IATF 16949 - Automotive Quality Systems Standard 10
Mr Roo Discovered dishonesty after performing an internal audit General Auditing Discussions 4
D ISO 13485--Question regarding performing calibrations in house. ISO 13485:2016 - Medical Device Quality Management Systems 13
M Who is performing quality control? IATF 16949 - Automotive Quality Systems Standard 2
AllTheThings ISO-17025 accredited TEST lab performing internal calibrations (Yes: Here is how) ISO 17025 related Discussions 8
Geoff Cotton Performing a Delta Audit General Auditing Discussions 12
A Does AS9100 require traceability to operators performing the work? AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 4
I Root Cause Analysis when someone simply stops performing a task? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 16
K ISO 17025:2017 clause 7.6.2 - Performing calibration of its own equipment shall evaluate the measurement uncertainty ISO 17025 related Discussions 6
H Question about implications of performing Firmware upgrade via MDDS - Medical Device Data Systems 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
N Justifications for not performing MSA (Measurement System Analysis) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
V Sequence of performing risk assessment: User_FMEA (User Errors) vs Design Inputs FMEA and Control Plans 1
Y Performing product audits in a manufacturing facility Manufacturing and Related Processes 13
armani ISO 9001:2015 - How to apply 7.1.5 to an organization performing only design ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 6
S Performing PQ on a Small (tabletop) Air Heat Treating Oven ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 4
B Thoughts on performing an ISO 9001:2015 Remote Internal Audit ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 8
H Performing a TUS on a Furnace used at One Temperature - AMS2750-E AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 27
drgnrider EMR performing audits of EMS Miscellaneous Environmental Standards and EMS Related Discussions 13
C Performing an ISO 9001 based Supplier Audit - Multiple Supplier Facilities Supplier Quality Assurance and other Supplier Issues 4
C Going Rate for Performing a Supplier Audit? Consultants and Consulting 1
B Performing MSA on Straightness of a Cylinder Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 13
C Performing a MSA as it relates to Calibration Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
J Performing a MSA on a new gauge using different parts Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
K Production Operators Performing GP12 (General Motors Containment) Customer and Company Specific Requirements 2
L How is the interaction physically happening while performing ANOVA GR&R? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
E Exam for Personnel performing Calibration General Measurement Device and Calibration Topics 7
M Requirements for Laboratories performing ASTM Tests Various Other Specifications, Standards, and related Requirements 4
A SOP for performing Annual Product Reviews for Medical Device and Pharma Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 3
D Severity or Occurrence? Performing an FMEA on Motorcycle Operation FMEA and Control Plans 9
K Performing PPAP Retroactively APQP and PPAP 8
H Proprietary Processes - How to Protect and still comply when performing an FAI? AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 5
J Performing Internal Calibrations - Dial gauges, micrometers, height gauges, calipers General Measurement Device and Calibration Topics 8
D External Parties performing Internal Audits? TS 16949 Clause 8.2.2 IATF 16949 - Automotive Quality Systems Standard 15
JoCam Budding Consultant: What to charge for performing a desktop study. Career and Occupation Discussions 10
Miner Upcoming article - Within-part variation when performing an R&R Imported Legacy Blogs 6
D Performing Internal Audit of our Accounts System Internal Auditing 4
S Performing Internal Audits as per Canada MDR GD 210 Internal Auditing 7
E Minimum data for performing an Anderson Darling Test Statistical Analysis Tools, Techniques and SPC 1
A Difficulties in performing MSA on Rockwell Hardness Tester Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 20
G Performing an Internal Audit on the Cost Estimating Process AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 7
6 Badly Performing Packaging Machines Manufacturing and Related Processes 1
D People Management - Managing an under performing subordinate Career and Occupation Discussions 15
armani Competence for performing compliance audits - 4.5.2 Miscellaneous Environmental Standards and EMS Related Discussions 6
C New to performing internal audits - Looking for audit questions Internal Auditing 5
P For business performing PRODUCT DEVELOPMENT ONLY, what is best QMS for certification? Quality Manager and Management Related Issues 2
A Justification for not performing overseas supplier audit General Auditing Discussions 6

Similar threads

Top Bottom