- What would be the best practice for doing an MSA on the torque Wrenches?
- How do you determine the "machine error" over time, as torque is represented as revelations?
- How would one make sure that the torque is still correct when process is completed. (sanity...

MSA on Torque wrench]]>

So in the MSA section the requirement is to use Control Limits and not specification limits on the MSA before SOP. To my knowledge Conrol limits are calculated by CL=m + or - 3*std deviation?

What global is saying, is we must redo the study but use Historical Standard deviation from our SPC done with line side data collection.

So when we redo the MSA using the same...

Difference between Control Limits and Historical Deviation]]>

I am a rookie in MSA. I just run few of them (both internal and for customers) but I still have some doubts regarding the correct way to run a Gage R&R when we have a tolerance given by our customers, and I hope you can help me to dissolve these doubts.

Here below two approaches to run a MSA:

1) Sample selection: samples taken on purpose over the entire tolerance field given by customer.

--> We consider the

Gage R&R according to customer spec]]>

Let me preface this with I am not six sigma certified.

I recently got a new job where we use a balance to measure the contamination on a tin. The general process is as follows:

- weigh tin
- add solvent w/ contaminate to tin
- evaporate solvent; leaving contaminate behind
- weigh tin again
- delta in weight is the weight of contaminate

Gage R&R - Uncertainty in Contamination]]>

First of all, I hope you and your families are all safe and healthy in these pandemic times.

I have a question about the Repeatability & Bias MSA (Type 1), maybe you can enlighten me:

Generally for Type one study we need to measure 30 time the same sample.

How it work with destructive tests? Should we only assess the Bias by measuring 30 different reference samples? What do you do generally? Any experience to share?

Any help is welcome

Samuele]]>

Performance to Tolerance (P/T) ratio uses σ_R&R / (USL - LSL) as an estimate of a gauge capability while GRR method uses σ_R&R / σ_total where σ_total is given by...

P/T ratio vs GRR - which is more meaningful and why?]]>

Quick question:

Theoretically, if for a MSA all the samples will be measured by the operators only once, we should not have information about the repeatability, right?

Why also Minitab give me varcomp and all the other information about repeatability?

thanks in advance.

Samuele]]>

Gauge R&R or just R?]]>

We ask for MSA's / PPAP's of our suppliers because our own customers insist on receiving the files for their administration. I have a fourth edition MSA book, but i'm hesitant to simply follow up on the information in the book.

Can someone explain to me what key factors are the most important when it comes to judging a supplier's MSA?

See the picture below, which we could use as an example.

View attachment 723]]>

GR&R gauge readings]]>

My team has designed and tested a measurement system that quality engineering department would like to perform a Gage R&R on it.

However, this measurement system is a one shot system. Basically it can be used once and then it is destroyed.

Note that the part it is measuring is not what is being destroyed, the actual measurement system is.

My questions are:

1. Am I correct to state that a nested, crossed or minitab's expanded Gage R&R is not appropriate?

2. What is the appropriate...

Gage R&R on a one shot measurement system]]>

I need to understand the interpretations of MSA study outcomes...Like equipment, appraiser ,part and total variations and their % Variations and NDC

What is the acceptable values for all and if not within the acceptable limits than what action to be taken to improve.

Please suggest.

Thanks in advance]]>

I am trying to determine whether the measurement systems in an fully automated line are stable enough to be approved. There are 4 different measurement systems that I need to look into.

Normally the MSA that I do are type 1 gage studies and gage R&R but in this case the type 1 gage study only gets me so far and the gage R&R isn't valuable since there aren't any other operators or measurement systems to compare against.

I took a class with Minitab and it seems like a gage linearity and...

MSA for Automated Equipment]]>

Please advise if it is necessary to do so. I think it is not necessary since the measuring equipment is the same, measurement method is the same.]]>

My question relates to the task I've been given - determining the precision of a measurement system.

At my work place we've recently installed a new bespoke end of line test machine.

The machine tests the performance of our products (electric motors) and spits out a series of results based on our test parameters. For now, let's assume it just gives one result for each motor.

What I've done is run a gauge R&R study and have all the usual results for repeatability...

Precision of Measurement System]]>

2. If there are several equipment with the same brand/model, can we do Bias, Linearity, GRR and Stability for only 1 equipment as representative?

I could not find this in AIAG MSA Manual, please advise.]]>

The spec. is 23in-lb +/- 10%, the tool we use is a torque screwdriver set as close as possible to the nominal (required by the customer)

In order to get the toque value we have a display torque meter where we get the value from to chart and record our readings.

My question is, what kind of spc chart should I use (I-MR)?

what GRR study (BIAS?) 3...

What kind of GRR study has to be performed?`]]>

I've got my 10pcs & 3 operators, having them measure the pcs twice on different days

Do i have to keep track of which part is which?

Or is it a completely randomized free-for-all for all six data sets that will be generated?

My understanding is one of the things R&R looks at is measurement difference on the same part for individual users and also between users. Yes/No?

If I don't keep things...

samples for R&R: do I have to keep track 'behind the scenes'?]]>