Question I need proof of: Why can't competent, but, non-production, indirect labor people do the Gage R&R. Forget that it's common sense. Where is it written that it MUST be done that way? I can't find anything direct in the TS MSA Manual. Thanks!]]>

I would like to have a clarification about the interpretation of Gage R&R results, used to evaluate the adequacy of a measurement system;

In particular, I would like to better understand how to interpret the average Rbar value shown in the R chart;

How can I use the R value of the R chart in order to understand if the measurement system is able to discriminate between different parts?

Thanks a lot in advance!!]]>

I have been asked the following question and am looking for answers. Since our 100% dimensional measurements (performed on the CMM) are on the control plan, do we need to perform a GRR for these? Thanks!]]>

My customer did not like the NDC of 2 and asked for a different measurement method. So we used a digital micrometer...

NDC (Number of Distinct Categories)]]>

Thanks,

Tim]]>

And we are on a discussion here,

Some engineers says:

We need 1 torque driver programmed to .49Nm, 3 Operators and 30 lectures each operator.

Other Engineers says

We need 10 torque drivers programmed to .49Nm, 3 Operators ,(we do not know how many lectures per driver or per Operator)

and other engineers says:

We need 10 torque driver first programmed to .3Nm then programmed to .49Nm and finally programmed to...

Best Option to Evaluate a Torque Reader?]]>

And, such a case, Reproducibility % will be boken down to 2 segments, which are 'By Operator%', and also 'Operator by Part%'.

If the results show that the "Operator by Part %' is high, which is one of the main contribution to the GRR variations, what are the possible corrective actions to be...

MSA ANOVA _ Operator by Part interaction]]>

I have been tasked with determining the average Melt Flow / Molecular Weight measurement for certain compound products.

I am collecting data by Polymer Grade type, and then formulation. For example:

Polymer Grade #1

Polymer Grade #1 with colorants only

Polymer Grade #1 with colorants and 20% Barium Sulfate

Polymer Grade #1 with 50% Bismuth Subcarbonate

Now for each category listed above - there may be 25 formulations that fall into that category. Because there is a slight...

Determining Melt Flow Range of Product]]>

1) for example measurement of an OD with a micrometer. I understand that it is preferable to get parts with a range throughout the tolerance in order to determine the linearity of the gage. Is it acceptable to use master gage blocks to substitute for actual parts.

2) I have been told that we can use a linearity study on a micrometer as a family. I disagree that you can't just pull a...

Linearity and Bias Requirements--Parts used and Gage families]]>

How do I calculate the % GRR for a one sided tolerance?

Typically I have a minimum paint thickness specified by the Customer. I can carry out a variable MSA to find the gauge variation, but I can not express this as a percentage of the tolerance, as the tolerance is only one sided.

Has anyone found the industry standard relating how to express this - I cannot see in MSA 4th?

I appreciate your thoughts about the real statistical validity of this, and also I would like your...

Variable MSA - % GRR for one sided tolerance]]>

"When grouping into families like we currently do for R&R’s can different manufacturers measuring the same characteristic and same range be in the same family?"

In other words, gage A from mfr X measures a diameter and gage B from mfr Y measures the same diameter, can the gages be grouped together or must all mfr X gages be grouped as one family and all mfr Y gages be...

Gage R&R study with different gage manufacturers]]>

this might be a question which might not be assigned to a specific topic.

Assume the follwoing:

There are upper and lower specification limits based an HFE or Usability studies. (e.g. Injection Forces 0N-100N )

The medical device has to fulfil this requirement.

In addition comfort levels were found to be 10N-15N.

Is a method, which was developed to evaluate/judge the 0-100 tolerance range - which allows for releasing the product, capable to judge if the "comfort level" is met...

"Capability" of methods]]>

We calibrated most of our own hand tools, calipers, mics, indicators and set up the calibration to use the full range of the gage.

We also conduct Gage R n R studies on all gages called out on the control plan. My struggle is that I can not find anything specific in the PPAP or MSA manuals that states a requirement for...

PPAP submissions/TS: Are all MSA Studies required?]]>

Thanks

Larry]]>

What can we use here? Nested GRR? If yes, is there a different calculation from crossed GRR? I have only standard AIAG form for crossed GRR. Could please someone share the form for...

GRR for destructive test-Crimped terminal pull-out force]]>

Is it allowed to use samples with out of spec. values for GRR study?

Thanks!]]>