One-Sided Tolerance Gage R&R Analysis

D

darkafar

#1
So far for one-sided tolerance non-replicable measurement system GRR analysis, the often used method I saw is to use the formula GRR%=GRR/TV by using iid samples.

The disadvantage of using this method is that it can’t differentiate the variance within a subgroup from the Equipment and appraiser variance, therefore makes the GRR% value much bigger.

I think that Tolerance should be used to decide if the GRR meets the requirements of product quality control especially for non-replicable measurement system.

Suppose the result data were normally distributed.

For example:
The sample hardness specification is > 60, so it is a one-sided tolerance.
Using three operators, take ten groups of samples, every group has nine samples that their variances were supposed negligible, and measure them.

Suppose the average of the above gathered data is 70, because we presuppose it’s normal distribution, we can predicate that the chance of the hardness value being 80 is as small as it being 60. Because 60 is the lower limit, I think we can use the specification 70+-10 as a specification substitute for the one-sided tolerance specification, therefore we can use the tolerance (80-60) divided by 6 to replace TV to get a better-looking GRR% result.

I don’t know how others think of this method. You comments are appreciated.
 
Elsmar Forum Sponsor
Thread starter Similar threads Forum Replies Date
G Destructive test, gage R&R with one sided tolerance Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
G How to complete gage R&R when you have only a single sided tolerance Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 14
B One sided tolerance Cylindricity - Result from MSA Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 10
B How do you specify a one sided tolerance for an MSA in Minitab v 16 Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
U One Sided Tolerance Distribution(s) Capability, Accuracy and Stability - Processes, Machines, etc. 5
A Converting 1-Sided Design Tolerance to a Bilateral Tolerance Statistical Analysis Tools, Techniques and SPC 8
C Gauge R&R %Tolerance Template for One-sided Tolerance - Wire Pull Tester Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
Miner Intro to MSA of Continuous Data - Part 9: %Tolerance for One-sided Specs Imported Legacy Blogs 3
B Calculating Capability on a One-Sided Tolerance Dimension Capability, Accuracy and Stability - Processes, Machines, etc. 12
X Calculating Tolerance with One Sided Limits - Need a Form to Calculate Statistical Analysis Tools, Techniques and SPC 6
A Precision/Tolerance Ratio for 1-sided Specification - How to Compute Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
L Calculating Cpk on a single sided (unilateral) tolerance Capability, Accuracy and Stability - Processes, Machines, etc. 28
S Determining Cpk on a single sided tolerance dimension Capability, Accuracy and Stability - Processes, Machines, etc. 3
T ISO 17025 Method Verification - One sided “F” test or two sided “F” test ISO 17025 related Discussions 1
B Does anyone have links to one sided CPK files? Excel .xls Spreadsheet Templates and Tools 2
P One sided confidence interval for probability plot in Minitab Using Minitab Software 1
M FDA Submission Printing Format - Is double sided printing allowed? Other US Medical Device Regulations 5
J Type 1 GRR (Gage R&R) on a One Sided Specification Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
optomist1 Nested Gage R & R One Operator One Sided Spec Using Minitab Software 5
optomist1 MSA Gage R&R - Destructive Test with One Sided Specification and One Operator Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
A How to define one sided spec or two sided spec for 70 +0.3 Capability, Accuracy and Stability - Processes, Machines, etc. 15
J Process Control/Standard Deviation Question on a One Sided Specification Capability, Accuracy and Stability - Processes, Machines, etc. 6
L %GRR/TV or /TW for GRR of One Sided Specification - Gage R&R Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
A Cp, Cpk for One Sided Specification Statistical Analysis Tools, Techniques and SPC 2
K Minitab version 15 Gage R&R and Single Sided Specification Using Minitab Software 5
S Using the results from GR&R (Gage R&R) Analysis - One sided dimension Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 25
T Double-sided (USL, LSL) Variables sampling plan Z1.9 - Use in Excel spreadsheet? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
J Control limits for one sided control charts using WECO rules Statistical Analysis Tools, Techniques and SPC 5
ScottK Measuring Capability on a One Sided Variable (Surface Finish) Capability, Accuracy and Stability - Processes, Machines, etc. 17
T One sided F-test in Minitab Using Minitab Software 5
S How to perform a Two One Sided T (TOST) Test in Minitab Using Minitab Software 8
S If a process has a one sided specification, what can I calculate for? Six Sigma 2
L One sided Control Chart with only UCL or LCL Statistical Analysis Tools, Techniques and SPC 2
D Ppk of non-normal bounded proccess, one sided specification Capability, Accuracy and Stability - Processes, Machines, etc. 3
Y Noise Tester GR&R (Gage R&R) study on one sided specification Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 9
T Calcuating a one sided (LSL) Cpk for Proccess Capability Capability, Accuracy and Stability - Processes, Machines, etc. 17
F Ppk/Cpk value with 1-sided specification - Only given a lower specification Statistical Analysis Tools, Techniques and SPC 1
G Setting Control Limits - SPC for one sided dimensions Statistical Analysis Tools, Techniques and SPC 2
K SPC for One-sided Specification - Setting the Lower Control Limit Statistical Analysis Tools, Techniques and SPC 4
G SPC control for one-sided specification Statistical Analysis Tools, Techniques and SPC 3
B Cp, Cpk, Sp, Spk for a one-sided minimum specification Capability, Accuracy and Stability - Processes, Machines, etc. 2
N Capability Calculations: Non-Normal Distributions and One Sided Distributions Statistical Analysis Tools, Techniques and SPC 4
C Capability index for one-sided specification? Cpk(max) = (USL-Xbar)/3*s ?? Capability, Accuracy and Stability - Processes, Machines, etc. 13
D Gage R&R on a Single Sided Nominal - What is an aceptable method? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 16
D Cpk for one sided dimension - GD&T true position Capability, Accuracy and Stability - Processes, Machines, etc. 15
D Tolerance symbol Inspection, Prints (Drawings), Testing, Sampling and Related Topics 8
D Calibration tolerance question using Pipettes Medical Device and FDA Regulations and Standards News 1
M Determining a tolerance value for Measuring devices in-house inspection General Measurement Device and Calibration Topics 12
G 0.00005" tolerance on micrometer with 0.0005" resolution? General Measurement Device and Calibration Topics 4
N Drawing tolerance vs. Measurement device General Measurement Device and Calibration Topics 7

Similar threads

Top Bottom