The Elsmar Cove Wiki More Free Files The Elsmar Cove Forums Discussion Thread Index Post Attachments Listing Failure Modes Services and Solutions to Problems Elsmar cove Forums Main Page Elsmar Cove Home Page
Go Back   The Elsmar Cove Forum > ISO (International Organization for Standardization) Standards > ISO 17025 - General Metrology, Measurement Device, Calibration and Test Laboratories > ISO 17025 and related Metrology Topics - Measurement Devices, Calibration and Test Laboratories
Forum Username

Search the Elsmar Cove
Custom Search
Monitor the Elsmar Forum
Follow Marc & Elsmar
Elsmar Cove Forum RSS Feed  Marc Smith's Google+ Page  Marc Smith's Linked In Page   Marc Smith's Elsmar Cove YouTube Page  Marc Smith's Facebook Page  Elsmar Cove Twitter Feed
Elsmar Cove Groups
Elsmar Cove Google+ Group  Elsmar Cove LinkedIn Group  Elsmar Cove Facebook Group
Donate and $ Contributor Forum Access

Courtesy Quick Links

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

Howard's
International Quality Services
Marcelo Antunes'
SQR Consulting
Bob Doering's
Correct SPC - Precision Machining

NIST's Engineering Statistics Handbook
IRCA - International Register of Certified Auditors
SAE - Society of Automotive Engineers
Quality Digest Portal
IEST - Institute of Environmental Sciences and Technology
ASQ - American Society for Quality
Reply
 
Thread Tools Search this Thread Rate Thread Content Display Modes
  #1  
Old 2nd October 2009, 05:21 PM
tknchancs tknchancs is offline
Inactive Registered Visitor

 
 
Posts: 2
Please Help! In-House Calibration - Digital Micrometer found Out of Calibration

We calibrate/verify, in-house against Jo-blocks calibrated to a known standard, the micrometers and calipers used for Production and Inspection. I recently came across a digital micrometer that is off .005 on the barrel and the screen is not working (probably dead battery). Can we make the necessary adjustments in-house or should we send it out to a calibration service?

Sponsored Links
  #2  
Old 2nd October 2009, 05:23 PM
Stijloor's Avatar
Stijloor Stijloor is offline
Super Moderator

 
 
Posts: 14,578
Re: In-house calibration

Welcome to The Cove Forums!

If your technician has the required competencies to make the necessary repairs and adjustments, yes you can do this in-house.

Stijloor.
Thanks to Stijloor for your informative Post and/or Attachment!
Sponsored Links

  #3  
Old 2nd October 2009, 09:17 PM
Big Jim Big Jim is offline
Appreciated Information Resource

 
 
Posts: 2,377
Re: In-house calibration

Quote:
In Reply to Parent Post by tknchancs View Post

We calibrate/verify, in-house against Jo-blocks calibrated to a known standard, the micrometers and calipers used for Production and Inspection. I recently came across a digital micrometer that is off .005 on the barrel and the screen is not working (probably dead battery). Can we make the necessary adjustments in-house or should we send it out to a calibration service?
The fact that you are asking tells me you probably should not. Those skills are not hard to learn, but if you don't know them the consequences can be disastrous.
Thanks to Big Jim for your informative Post and/or Attachment!
  #4  
Old 2nd October 2009, 09:39 PM
BradM's Avatar
BradM BradM is offline
Forum Administrator

 
 
Posts: 5,691
Re: In-house calibration

Quote:
In Reply to Parent Post by tknchancs View Post

We calibrate/verify, in-house against Jo-blocks calibrated to a known standard, the micrometers and calipers used for Production and Inspection. I recently came across a digital micrometer that is off .005 on the barrel and the screen is not working (probably dead battery). Can we make the necessary adjustments in-house or should we send it out to a calibration service?
Hello there! In other words, howdy, from a fellow Texan!

It depends on the reason the instrument is out of calibration. The parallelism may be off on the jaws. If so, it may be worth it to trash the instrument and replace them.

1. Assure the problem is not with the standard or the calibrator.
2. Try to determine what the problem is with the instrument. Most dimensional instruments (Mitutoyo, Starrett, etc.) don't usually get off, if they have demonstrated repeatability. But it does happens.

Just write up the issue, assure that no significant impact has occurred, replace the instrument, and move on.

__________________

If you appreciate The Cove, please consider contributing: http://elsmar.com/subscribe.html
Thanks to BradM for your informative Post and/or Attachment!
  #5  
Old 2nd October 2009, 09:39 PM
AndyN's Avatar
AndyN AndyN is offline
Forum Moderator

 
 
Posts: 7,800
Thumbs up Re: In-house calibration

I agree with Jim!

When you say it's off by an amount, it's useful/necessary to know where it's off also. Is it only at zero? Or does a (similar) error occur along the range? Calibration should check for that, not just at zero!

__________________

'Cause you know sometimes words have two meanings.....
  #6  
Old 3rd October 2009, 04:02 AM
brahmaiah - 2010 brahmaiah - 2010 is offline
Inactive Registered Visitor

 
 
Posts: 471
Re: In-House Calibration - Digital Micrometer found Out of Calibration

Quote:
In Reply to Parent Post by tknchancs View Post

We calibrate/verify, in-house against Jo-blocks calibrated to a known standard, the micrometers and calipers used for Production and Inspection. I recently came across a digital micrometer that is off .005 on the barrel and the screen is not working (probably dead battery). Can we make the necessary adjustments in-house or should we send it out to a calibration service?
You have to send it for recalibration after replacing the battery cell.
And secondly you have to investigate if the defective instrument was used to measure any products.If so required corrective action should be taken without delay.
V.J.Brahmaiah

__________________

VJBrahmaiah
  #7  
Old 13th October 2009, 08:42 AM
tknchancs tknchancs is offline
Inactive Registered Visitor

 
 
Posts: 2
Re: In-House Calibration - Digital Micrometer found Out of Calibration

Thanks for the input!
  #8  
Old 16th October 2009, 09:16 PM
brobinson brobinson is offline
Involved in Discussions

 
 
Posts: 19
Apple Re: In-House Calibration - Digital Micrometer found Out of Calibration

Throw away micrometers for parallelism error?

Wow...Must have an unlimited budget or are buying the el cheapos made of poor quailty in ZaZa Land.

There are several factors that could contribte to the gague being off .005" Some possibilities that I would consider:
1) Possibly a burr on the spindle or anvil face.
2) Parallelism of the two faces could be off.
3) The flatness of the anvil or spindle face could be of error.
4) Zero setting is off.
5) Standard is not qualified to nominal dimension.

These checks can be performed by trained technicians as stated earlier. The adjustment of zero can easily be done. If parallelism is bad, the gauge should be sent out to a reputable calibration house to have the faces lapped parallel and the thimble repositioned to compensate for the change.

Being off .005" is rather significant.

There are just too many variables to consider when there is an error this large. Simple adjustments of a few tenths- to a few thousandths of an inch can be made on the barrel. Over this and the zero line becomes too far out of position to easily read the gauge for future inspections. If an adjustment is .005" is required after all other possibilites are eliminated, I sugges that the thimble be repositions on the spindle and leave the barrel adjustment for the smaller increments.
Thanks to brobinson for your informative Post and/or Attachment!
Reply

Lower Navigation Bar
Go Back   The Elsmar Cove Forum > ISO (International Organization for Standardization) Standards > ISO 17025 - General Metrology, Measurement Device, Calibration and Test Laboratories > ISO 17025 and related Metrology Topics - Measurement Devices, Calibration and Test Laboratories

Do you find this discussion thread helpful and informational?


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
Micrometer Calibration - Seeking actual Calibration Procedure for 0-1" Micrometer dbulak ISO 17025 and related Metrology Topics - Measurement Devices, Calibration and Test Laboratories 19 6th April 2012 06:44 AM
Flow Meter Calibration - Outside Calibration Service vs. In-House Calibration CDISO ISO 17025 and related Metrology Topics - Measurement Devices, Calibration and Test Laboratories 3 1st November 2011 08:00 PM
Pin Gauge Calibration using a Micrometer - Accuracy & Calibration Level Question Coleman Donnelly ISO 17025 and related Metrology Topics - Measurement Devices, Calibration and Test Laboratories 10 29th November 2007 01:59 PM
Calibration Outsourcing vs. In House Calibration - Outrageous Costs of Calibration Cathy Everett ISO 17025 and related Metrology Topics - Measurement Devices, Calibration and Test Laboratories 28 5th September 2006 12:50 AM
In-house calibration - Resource for calibration, adjustment of calipers, indicators janah214 ISO 17025 and related Metrology Topics - Measurement Devices, Calibration and Test Laboratories 2 10th July 2005 10:15 PM



The time now is 12:19 AM. All times are GMT -4.
Your time zone can be changed in your UserCP --> Options.


   


Marc Timothy Smith - Elsmar.com
8466 LeSourdsville-West Chester Road, Olde West Chester, Ohio 45069-1929
513 341-6272
NOTE: This forum uses "cookies".