Please review my Vernier Caliper Gauge R&R

B

benzkumar

#1
hello All,

I'm new to MSA & Gauge R&R, recently i calculated the gauge R&R for an automotive part.

LSL - 27.50
USl - 28.50
Instrument used - Vernier Caliper LC - 0.02mm

Im not sure the gauge R&R is correct,
Please review the attached file & help me out.

Thanks.
Selva
 

Attachments

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Miner

Forum Moderator
Staff member
Admin
#2
It all depends on the use to which you plan to put this gauge.

The gauge is perfectly suitable to use for inspection to tolerance (% of Tolerance < 10%). However, it is not acceptable for use in process control (% of Total Variation >> 30%) UNLESS your parts do not represent the true process variation.
 
E

eturkan

#3
Deviation in repeatability and reproducibility is very good. The problem is the PV.
Find a few parts that is close to USL and add them to the study.Your GRR should be less than 10% after that..

Is it real data? There is some copy paste error in Part 8/Trial 1 for all operators.
 

Miner

Forum Moderator
Staff member
Admin
#4
Find a few parts that is close to USL and add them to the study.Your GRR should be less than 10% after that..
Parts should represent actual process variation, and should not be selected solely for the purpose of passing.
 
E

eturkan

#5
You are the most experienced user on elsmar in Gage R&R that I am aware of.

I agree with what you say yet it is next to impossible to get a Gage R&R under 30% if your current process variation corresponds to only 1/10 of the tolerance span.

I usually request process deviation to increase the part variation span within USL-LSL.
 

Golfman25

Trusted Information Resource
#6
For what it is worth we have never been able to get a caliper gage R&R below 30. I am not sure it is a functional gage in today's environment. Good luck.
 
D

debyang

#7
From the provided data, the UCL R is aroud 0.051, but for part #6, both Rs of A and C are 0.060, you should investigate this out of control issue; besides, it seems that the Part and Assessor interaction is significant, you should use ANOVA to do this GRR study.
 
G

guruprasadb

#8
Dear mr Benz Kumar,

Good Day,

As per MSA 4 the edition the below points to be considered for MSA GR&R
we should plot both Xbar chart & r bar chart and consideration is as below

For Average Chart
The area within the control limits represents the measurement sensitivity. Since the group of parts used in study represents the process variation approximately one half or more of the averages should fall outside the control limits . if the data show this pattern then the measurement system should be adequate to detect part to part variation and measurement system can provide useful information useful for analysing and controlling the process.

For Range Chart
“UCLR represents the limit of individual R's circle those that are beyond this limit. Identify the cause and correct. Repeat these readings using the same appraiser and unit as originally used or discard values and re average and re compute R and the limiting value from remaining observations”
If one appraiser is out of control the method used differs from the others
If all appraisers have some out of control ranges the measurement system is sensitive to appraiser technique and need improvement to obtain useful data.

Based on the data you provided my observation is
If we plot average chart for the data provided then approx 30 % of reading are out of control limits ..........
If we plot range chart for the data provided then about 2 readings are out of control limits .............
 
Last edited by a moderator:
D

debyang

#9
hello All,

I'm new to MSA & Gauge R&R, recently i calculated the gauge R&R for an automotive part.

LSL - 27.50
USl - 28.50
Instrument used - Vernier Caliper LC - 0.02mm

Im not sure the gauge R&R is correct,
Please review the attached file & help me out.

Thanks.
Selva
Hi, Selva

There is a mistake in your spreadsheet; the B40 shloud be corrected and devided by 6 for 99.73% of tolerance coverage, please refer to the attachment, which some ANOVA result is also included for your references.
 

Attachments

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