# Gauge R&R for Hardness Tester

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Viewing 8 posts - 1 through 8 (of 8 total)
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• #55959

Participant

Dear All,

I am doing six sigma project on reduction on variability in martensite %, Presently i am in measure phase, while doing Gauge R&R in Rockwell hardness tester i am not getting Gauge R&R.

Sample used: Standard Block
Tolerance in standard block: Upper limit – Lower Limit = 2 HRC

Machine specification:
Make : Matsuzawa
Model : Rockwell
Machine Error : +/- 1.0 HRC
Decimal Range: 0.1 HRC
Calibration : Valid
Calibration type: External

Gauge R&R study:
Sample – 1 (Standard Block for all test)
# of operator: 3
# of replication: 2

Gage R&R Results:

%Contribution
Source VarComp (of VarComp)
Total Gage R&R 0.0157417 100.00
Repeatability 0.0148333 94.23
Reproducibility 0.0009083 5.77
Part-To-Part 0.0000000 0.00
Total Variation 0.0157417 100.00

Process tolerance = 2

Study Var %Study Var %Tolerance
Source StdDev (SD) (6 × SD) (%SV) (SV/Toler)
Total Gage R&R 0.125466 0.752795 100.00 37.64
Repeatability 0.121792 0.730753 97.07 36.54
Reproducibility 0.030139 0.180831 24.02 9.04
Part-To-Part 0.000000 0.000000 0.00 0.00
Total Variation 0.125466 0.752795 100.00 37.64

Number of Distinct Categories = 1

Seeking your direction to proceed further.

Sincerely,

G.Bathrinarayanan

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#202367

Chris Seider
Participant

did you check the site? Lots of stuff on gage R&R. Promise! :)

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#202384

Mike Carnell
Participant

@badrinarayanan I saw this in the iSixSigma news letter and have meant to get back to this all week. When you do a Gage Study the first thing you look at is number of Distinct Categories. If you do not have enough then none of the other numbers mean anything. In your case you have 1. Basically your gage has no resolution.

This can be caused by a lot of things the first being the gage has no capability. The second thing, and you need to check this, is that if your samples are all the same then the analysis comes out that the gage cannot tell the difference when in fact you chose samples incorrectly.

You need to resolve this issue before you even worry about the other numbers.

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#202385

Ken Feldman
Participant

@cseider, I’m surprised you didn’t take the time to read the original post more closely. Mike is right. With only 1 number of distinct categories, all you can tell is that there is a “part”. Two categories will only let you tell good and bad. And so forth….. Selecting a variety of parts composed of “good”, “bad” and some in-between will give you the chance of getting enough variety that you can actually determine the GR&R. Otherwise the noise of the measurement system overwhelms the signal associated with the parts. So, to reiterate what Mike said, it is either a gage with no resolution or parts with no variation.

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#202387

Chris Seider
Participant

@darth

Yes, you and Mike were more exact but I was thinking they hadn’t researched much but you and Mike were correct–I just didn’t be as pointed with my help.

Hope FL treating you well.

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#202405

Mike Carnell
Participant

@cseider Are you going to take that? He doesn’t show up here for a couple years acting like a bully after you have been carrying the load all this time.

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#202407

Chris Seider
Participant

LOL, @mikecarnell “water off a duck’s back”.

Hope HOU went well. At least the Astros did well.

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#202423

Mike Carnell
Participant

@Cseider Hou went well or at least successful. Thanks for asking.

Darth is getting old, Actually he was always old so he is just getting older and grouchier.

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