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  Measurement, Test and Calibration

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Author Topic:   Caliberation
Uteesh Dhar
Lurker (<10 Posts)

Posts: 5
From:Muscat, Oman
Registered: Sep 2000

posted 29 September 2000 04:49 PM     Click Here to See the Profile for Uteesh Dhar   Click Here to Email Uteesh Dhar     Edit/Delete Message   Reply w/Quote
A very simple question?

We are a textile fabric company. Meters are on the folding machines. How should we caliberate these meters?

At present, we are folding one piece of fabric of 30 yards and then after unfolding the same ,m measure the fabric with normal inch tape available in the market.

How to caaliberate this inch tape too?

If any body helps?

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Jerry Eldred
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Posts: 136
Registered: Dec 1999

posted 29 September 2000 05:00 PM     Click Here to See the Profile for Jerry Eldred   Click Here to Email Jerry Eldred     Edit/Delete Message   Reply w/Quote
If your purpose is only to make sure your equipment is accurate enough for your product, I suggest having a tape measure calibrated, and use the tape measure to check your machine. I worked in a laboratory that calibrated tape measures. One detail I found was that some tape measures are very good, and some tape measures are not very good. I would advise purchase of a good tape measure. There are some good quality companies (such as Starrett, Brown & Sharpe, Mitutoyo, and others) that make accurate tape measures.

If the purpose of your tape measure is to keep an auditor happy, you will also need to have some documentation as to how you check your folding machine. If you need more detail, please ask, and I will try to help.


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Rick Goodson
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Posts: 102
From:Wuakesha, Wisconsin, USA
Registered: Aug 2000

posted 29 September 2000 05:55 PM     Click Here to See the Profile for Rick Goodson   Click Here to Email Rick Goodson     Edit/Delete Message   Reply w/Quote
Jerry makes a very good point about the tape measures. I would suggest one step further. Do the finacial analysis on the cost of calibrating the tape measures versus the cost of scrapping and replacing on a periodic basis. In a past life the replacement option was considerably less expensive than calibrating (verifying) the tape measures

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Jerry Eldred
Forum Wizard

Posts: 136
Registered: Dec 1999

posted 02 October 2000 10:22 AM     Click Here to See the Profile for Jerry Eldred   Click Here to Email Jerry Eldred     Edit/Delete Message   Reply w/Quote
I would not have a problem with the possibility of replacing rather than re-calibration in some circumstances.

I might be hesitant about that method in some circumstances. That is, if you discard the tape measure which you purchased with a certification, and replace it with another, you will lose continuity of your measurements.

For example, Let us say you purchase a new certified tape measure, and use it for a year. At the end of the year you discard it, and replace it with another new one of the same type.

You have no way of knowing if the old tape measure ever went out of tolerance, because you have no historical data. The possible way around that would be to obtain some documentation from the manufacturer as to how long it stays in tolerance. And believe me, they can and do go out of tolerance. And some of the manufacturer's certificates are not correct. I won't mention any manufacturer names as that would not be appropriate. But I have attempted to recertify tape measures that had certificates with them, and the tape measures were out of tolerance. And when they are out of tolerance, they must be discarded.

One alternative might be to purchase a 'good' three foot or one meter ruler with a certificated. Make that the standard, and only recalibrate it once every two or three years. Use that to verify the tape measures instead of sending them out. The details will be important, as you will have to properly specify an adequate ruler, and properly specify what level of accuracy you are verifying on the tape measure.


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Forum Contributor

Posts: 48
From:Williamstown, MA
Registered: Oct 2000

posted 29 October 2000 01:44 PM     Click Here to See the Profile for CJacobsen   Click Here to Email CJacobsen     Edit/Delete Message   Reply w/Quote
Retracted my post on this one...sorry

[This message has been edited by CJacobsen (edited 30 October 2000).]

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