The Cove Business Standards Discussion Forums More Free Files Forum Discussion Thread Post Attachments Listing Cove Discussion Forums Main Page
UL - Underwriters Laboratories - Health Sciences
Go Back   The Elsmar Cove Business Systems and Standards Discussion Forums > Common Quality Assurance Processes and Tools > General Metrology, Measurement Device, Calibration and Test Laboratories > Gage R&R (GR&R) and MSA (Measurement Systems Analysis)
Forum Username

Elsmar Cove Forum Visitor Notice(s)

Wooden Line

How do I calculate Gage R&R (GR&R) with 1 tester, 1 operator, 3x4 units?


Elsmar XML RSS Feed
Elsmar Cove Forum RSS Feed

Monitor the Elsmar Forum
Sponsor Links



Courtesy Quick Links

Links that Cove visitors will find useful in your quest for knowledge:


International Standards Bodies - World Wide Standards Bodies

ASQ - American Society for Quality

International Standards Organization - ISO Standards and Information

Howard's
International Quality Services

Marcelo Antunes'
SQR Consulting, and
Medical Devices Expert Forum

Bob Doering
Bob Doering's Blogs and,
Correct SPC - Precision Machining

NIST's Engineering Statistics Handbook

IRCA - International Register of Certified Auditors

SAE - Society of Automotive Engineers

Quality Digest

IEST - Institute of Environmental Sciences and Technology

Reply
 
Thread Tools Search this Thread Rate Thread Content Display Modes
  Post Number #1  
Old 12th July 2006, 03:49 PM
iii_v

 
 
Total Posts: 1
Question How do I calculate Gage R&R (GR&R) with 1 tester, 1 operator, 3x4 units?

hello all,

I apologize in advance if this is has been hashed out (or so basic it's not worth asking). but i couldn't do a good search to find what i need.

by the way, I'm spanking-new to QA.. and I'm frantically trying to figure out what I'm trying to calculate... so please bear with me.

A customer has asked for GR&R information on our test setup. I think we have data to generate the value, but I have no idea how to calculate it.

1 test equipment
1 operator
3 control units that has 4 channels (essentially 3x4=12 separate measurements per test)
50+ tests (yes. 50x12 data points!)

I can get stdev for each separate channel (have 12 separate stdev). after that, what do I do? also another stupid question is, what unit is GR&R and what does it really mean? (e.g. GR&R=1 vs GR&R=10, 20, etc. I guess I'm sort of looking for a rule-of-thumb guidlines like, GR&R=y is ideal, GR&R=z is very bad, etc).

help!
Linda

Sponsored Links
  Post Number #2  
Old 12th July 2006, 09:24 PM
Miner's Avatar
Miner

 
 
Total Posts: 3,869
Re: How do I calculate GR&R with 1 tester, 1 operator, 3x4 units?

You cannot determine GRR with this setup. The best that you can do is determine repeatability, but not reproducibility. Given your criteria, I recommend performing the AIAG Stability study. A calculation shown in this method will provide the repeatability of the measurement system. Is there a reason that you cannot use multiple operators?

GRR results are either 5.15 or 6 standard deviations in the same measurement unit. However, this is typically converted into a percentage of the tolerance (P/T Ratio) or as a percentage of the process variation (% GRR). The rule for these ratios are: < 10% is ideal, < 30% may be acceptable depending on the importance of the characteristic, the feasibility of improving the measurement system, etc. and > 30% is not acceptable.

P/T Ratio is used to determine whether the gage is acceptable for inspection purposes. %GRR is used to determine whether the gage is acceptable for process control, capability studies or process improvement.

Last edited by Miner; 12th July 2006 at 09:30 PM.
Thank You to Miner for your informative Post and/or Attachment!
Sponsored Links

  Post Number #3  
Old 13th July 2006, 03:53 AM
jrubio's Avatar
jrubio

 
 
Total Posts: 547
Re: How do I calculate GR&R with 1 tester, 1 operator, 3x4 units?

Quote:
In Reply to Parent Post by iii_v

hello all,

I apologize in advance if this is has been hashed out (or so basic it's not worth asking). but i couldn't do a good search to find what i need.

by the way, I'm spanking-new to QA.. and I'm frantically trying to figure out what I'm trying to calculate... so please bear with me.

A customer has asked for GR&R information on our test setup. I think we have data to generate the value, but I have no idea how to calculate it.

1 test equipment
1 operator
3 control units that has 4 channels (essentially 3x4=12 separate measurements per test)
50+ tests (yes. 50x12 data points!)

I can get stdev for each separate channel (have 12 separate stdev). after that, what do I do? also another stupid question is, what unit is GR&R and what does it really mean? (e.g. GR&R=1 vs GR&R=10, 20, etc. I guess I'm sort of looking for a rule-of-thumb guidlines like, GR&R=y is ideal, GR&R=z is very bad, etc).

You need:

1 test equipment
2 operators, Just see the Templete. See Atachement

Althoug this Version is now Obsolet, The costant has changed, Update it.

10 meassurements times two for Every Operator

By two Operators means 40 meassurents, See templete.
Attached Files: 1. Scan for viruses before using, 2. Please report any 'bad' files by Reporting this post, 3. Use at your Own Risk.
File Type: xls GRR Delphi.xls (86.5 KB, 415 views)
Reply

Lower Navigation Bar
Go Back   The Elsmar Cove Business Systems and Standards Discussion Forums > Common Quality Assurance Processes and Tools > General Metrology, Measurement Device, Calibration and Test Laboratories > Gage R&R (GR&R) and MSA (Measurement Systems Analysis)

Bookmarks



Visitors Currently Viewing this Thread: 1 (0 Registered Visitors (Members) and 1 Unregistered Guest Visitors)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Forum Search
Display Modes Rate Thread Content
Rate Thread Content:

Forum Posting Settings
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Discussion Threads
Discussion Thread Title Thread Starter Forum Replies Last Post or Poll Vote
Gage R&R - Digital Torque Wrenches - 5-50 nM range units brucep@magna Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 12 26th March 2013 08:09 AM
How to calculate Relative Uncertainty - Measurements are in different units amanbhai Measurement Uncertainty (MU) 4 12th November 2010 03:19 AM
Gage R&R on a Tensile Tester RosieA Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6 11th August 2010 09:47 PM
How to calculate supplier PPM with multiple units vallesj Supplier Quality Assurance and other Supplier Issues 9 3rd September 2008 09:03 AM
Independent Tests - Another operator or tester to do the final test? b3playa Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2 10th April 2006 03:24 PM



The time now is 04:28 PM. All times are GMT -4.
Your time zone can be changed in your UserCP --> Options.


 
 


NOTE: This forum uses "Cookies"