We selected and numbered 30 pieces of each component and measured all the critical to function dimensions in the US and shipped the parts to China where they were measured...

Correlation Between two OGP optical comparators]]>

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)]]>

- Populated an Excel file with Measurements Data from the example contained AIAG MSA 4th. edition document and applied the same formulas.

- Populated Minitab with the same data.

- Compared the results.

It looks like data considering interaction are matching while others no.The difference seems to be the F-Ratio which is calculated in a very...

ANOVA GR&R: Minitab vs AIAG MSA (Any difference?)]]>

New to the forum and fairly new to MSA studies.

One thing that comes up at my works which causes arguments time and time again is the need for a Gage R&R Type II on automated test equipment.

Our procedure for an MSA, which I guess is the same for others, is to do a Type 1 first.

If you know an operator can influence the test result, then you do a Type II, otherwise you do a Type III.

Now, the test equipment in question is an automated In-circuit tester which performs various...

Gage R&R Type 2 on automated test equipment - Should it not be Type III?]]>

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!]]>

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]]>