OldTools Archive
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268141 | dstar@a... | 2019‑03‑20 | unidentifiable spring caliper, steel and brass |
Hey Porch. Coming out of lurk mode to ask a question. I have a caliper, or at least I think that's what it is, that looks old and is made of brass and steel. The caliper has a register that is made of brass with the rest of the tool being steel. It is pinned together with a small flat head screw and gets its "spring" action from a section of a leg split and bent upward to act as a spring so that when you squeeze the legs the caliper opens and the end of one leg points to the register. Hard to explain. See pics here: https://www.flickr.com/photos/122649122@N.../albums/72157677299550057 There is something missing at the end of the pointing leg. Probably a screw/lock nut to hold the caliper at the reading? On the back of the register is a hand written note in cursive (which my ten year would consider a foreign language, but that's another story); "Each degree represents 1/132 of an inch or 1/5 and 1/4 millimeters". Anyone know what this is? Jason |
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268144 | Bill Ghio | 2019‑03‑20 | Re: unidentifiable spring caliper, steel and brass |
I had one of those once and it was identified as an opticians tool for measuring the thickness of eyeglass lenses. Bill |
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268148 | Ed Minch <ruby1638@a...> | 2019‑03‑20 | Re: unidentifiable spring caliper, steel and brass |
And it would work on any material that was fairly hard, but the points can sink into wood Ed |
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268149 | Peter McBride <peter_mcbride@b...> | 2019‑03‑20 | Re: unidentifiable spring caliper, steel and brass |
That is a douzieme gauge, for jewellers and watchmakers. It is a French measuring standard based on 12ths. It has passed into to disuse in my trade. Here in AU I know a jeweller who still uses it and he called the 0-12 “numbers” and so on up the scale. The French call them “lines”. Various standard pieces and dimensions used in construction of a ring, for instance, are made of those thicknesses or diameters. Claws, band thicknesses, setting height etc. one “number” is 0.188mm. It just happens that 2 through 12 times that thickness land on some very appropriate dimensions of parts of jewellery. The use of mm has pretty much replaced that standard but in my workshops for 40 plus years very, very often we’ve said, a fraction over or under say 0.7mm or 1.0mm and looking at the douzieme gauge we’d be on one of the ‘numbers’ or ‘lines’ Cheers, Peter |
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268158 | Chuck Taylor | 2019‑03‑21 | Re: unidentifiable spring caliper, steel and brass |
Jason asked for help identifying a spring caliper: https://www.flickr.com/photos/122649122@N.../albums/72157677299550057 I received a similar tool from Galootaclaus (with a little help from Curt Seeliger) back in December 2016. I posted a picture on Galoot Image Central, but alas it is no longer accessible. The spring mechanism on mine is more conventional, but it functions the same. Peter McBride pointed out that it is a specialized tool used by jewelers. I have found that it is also useful in measuring the thickness of a saw plate. Chuck Taylor north of Seattle USA |
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268162 | Don Schwartz <dks@t...> | 2019‑03‑21 | Re: unidentifiable spring caliper, steel and brass |
On 2019-03-20 8:41 p.m., Chuck Taylor via OldTools wrote: > I posted a picture on Galoot Image Central, but alas it is no longer accessible. Mmmm. Try this as a start: http://galootcentral.com/component/option%2ccom_copperminevis/Itemid%2c 2/index.html">http://galootcentral.com/component/option%2ccom_copperminevis/Item id%2c2/index.html Don -- “Nature does not care for your opinion.” Robin Coope A thermometer is not liberal or conservative. - Katharine Hayhoe Of all the tyrannies that affect mankind, tyranny in religion is the worst. Thomas Paine Being offended doesn't make you right. |
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268172 | Chuck Taylor | 2019‑03‑21 | Re: unidentifiable spring caliper, steel and brass |
> I posted a picture on Galoot Image Central, but alas it is no longer accessible. Don wrote: ===== Mmmm. Try this as a start: http://galootcentral.com/component/option%2ccom_copperminevis/Itemid%2c 2/index.html">http://galootcentral.com/component/option%2ccom_copperminevis/Item id%2c2/index.html ===== I had gotten that far before, and to my gallery ("saltchuck") on page 5. The thumbnail is visible, but clicking on the thumbnail leads to a 404 "File Not Found". At least that gave me the file name, and I found it on my local computer. I put a copy with my 2018 Galootaclaus pictures here: https://www.dropbox.com/s/5sk9cwgsfqs8z7b/Galootaclaus2016-2.jpg?dl=0 The caliper in question is the one on the top right. Cheers, Chuck Taylor north of Seattle -- “Nature does not care for your opinion.” Robin Coope A thermometer is not liberal or conservative. - Katharine Hayhoe Of all the tyrannies that affect mankind, tyranny in religion is the worst. Thomas Paine Being offended doesn't make you right. |
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