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Measuring Stamp Thickness

 
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Posted 01/10/2019   11:59 am  Show Profile Check 51studebaker's eBay Listings Bookmark this reply Add 51studebaker to your friends list  Get a Link to this Reply
Hi itma,
Agreed. Try to find some known thicknesses and perfect you technique and 'feel' for the caliper/tool. Do this before you try any stamps. I have trained a number of QA people over the years on measurement processes; striving for a consistent process and feel for the tool and process will definitely pay off in the long run.

What I see a lot of today are stamp hobbyists who simply go buy cheap digital caliper, as soon as it comes in they grab a stamp and start measuring. This is a sure way to fool oneself, especially if they already have a thickness number in mind.
Don
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Posted 01/10/2019   12:25 pm  Show Profile Bookmark this reply Add itma to your friends list  Get a Link to this Reply
Thanks, Don.
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Posted 01/11/2019   02:36 am  Show Profile Bookmark this reply Add DrewM to your friends list  Get a Link to this Reply
For what it's worth, I looked into micrometers, etc. to measure paper thickness awhile back, and I came away pretty convinced that as with many other things the accuracy of the Chinese-made equipment -- which is often the cheapest -- was not very reliable. I heard many stories of them not only mis-measuring (which can happen with any equipment) but actually breaking. Cheap technical equipment seems like a contradiction in terms. Read the reviews if you can. And, as noted already, measuring paper thickness is not a very exact science since paper is flexible. With metal, thickness gauges will be pretty reliable. With paper, as tight as you get the gauge, the thinner the paper is going to seem.
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Posted 01/12/2019   07:29 am  Show Profile Bookmark this reply Add Joy Daschaudhuri to your friends list  Get a Link to this Reply
@51studebaker

Quote:

This is a sure way to fool oneself, especially if they already have a thickness number in mind.


I object to this wild comment.
I am sure you have never handled Por. India Cor˘a or Ceres keytype issues. Anyone serious about these stamps will know how important is paper thickness to differentiate array of differenet papers (sometimes thicknesses differ in same type of paper) and there is specialist literatures on the paper thickness of Por. Colonies Cor˘a/Ceres stamps including ═ndia.

It is absolutely OK (nothing foolish about it) if one has a number (recorded range) in mind when measuring paper thickness of postage stamps. What matters is the mastering the use of micrometer (SAFE 9680 Digital Micrometer I mentioned, specifically prepared for stamps but outrightly rejected by the OP) which requires some practice.

There is a children's comedy classic literature in Bangla language (my mother tongue) titled "Heshoram Hushiyarer Diary" by Sukumar Ray (1887-1923) where a character named Chandrakhai, the nephew of the protagonist Professor Heshoram during his expedition to an unidentified location near Bandikush Mountain (fictional place based on Hindukush), measured the height of a hill by trigonometrical survey calculation at "42000 feet".
Realizing that world's highest mountain Mt. Everest is only 29000 feet, after several recalculations yielding different results every time, the height was finally calculated at only 2700 feet.

So, a "range" guide is always helpful.
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Posted 01/12/2019   07:45 am  Show Profile Check 51studebaker's eBay Listings Bookmark this reply Add 51studebaker to your friends list  Get a Link to this Reply
Hi Joy,
It was not a 'wild comment', it was a responsible comment. My context was a collector far less experienced then you. Please keep in mind that the majority of people who read these posts are casual collectors. They read a post about paper thickness, go online to buy a cheap caliper, have a thickness number in mind, then conformation bias kicks in as they measure for the first few times.

No, I have not handled Por. India Cor˘a or Ceres keytype issues. But in a manufacturing QA capacity I have made tens of thousands paper thickness measurements. I have trained dozens of people on how to use calipers. As Moderator here, I feel it is part of my job to help the silent 'lurkers' and other less experienced members. Please do not assume that that my posts are directed to the handful of experience people like yourself.
Don
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Posted 01/16/2019   10:20 am  Show Profile Bookmark this reply Add Boxcar1954 to your friends list  Get a Link to this Reply
Have been watching this thread a while, and appreciate your comments Studebaker about being aware of confirmation bias, etc. I settled on a Clockwise Tool DCLR 0605. I usually take three or four measurements of a given stamp on different axes and along the middle and the edge to get a better idea. Paper thickness being what it is, there is sometimes a range, but not usually enough to matter. Michel uses ranges of paper thickness to differentiate between types and the ranges are usually enough to encompass what I find 'in the wild'. Users should just be patient and most importantly practice, practice, practice, with the tool. Read the catalog carefully and use the tool to improve your skills and advance your knowledge!
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