Reference blocks for calibration

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dykker5502
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Reference blocks for calibration

Post by dykker5502 » Sat May 27, 2023 5:04 pm

Ford Motor Company acquired a Swedish company that produced reference blocks in steel to be used for calibrating measurement equipment.
What was the name of that Swedish company?
Referenceblokke.jpg
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DanTreace
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Re: Reference blocks for calibration

Post by DanTreace » Sat May 27, 2023 5:16 pm

Blocks made by Carl E. Johansson


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Rich Eagle
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Re: Reference blocks for calibration

Post by Rich Eagle » Sat May 27, 2023 5:20 pm

Johansson gauges?
1896 Swedish machinist Carl Edvard Johansson.
gage blocks, Johansson gauges, slip gauges, or Jo blocks.
Oops, Dan got there first.
When did I do that?

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dykker5502
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Re: Reference blocks for calibration

Post by dykker5502 » Sat May 27, 2023 6:54 pm

Thanks both!
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Erik Johnson
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Re: Reference blocks for calibration

Post by Erik Johnson » Sat May 27, 2023 10:53 pm

In 1884, Carl Edvard Johansson attended my alma mater, Gustavus Adolphus College in St. Peter, MN before returning to Sweden.

In 1932, the college gave him an Honorary Doctor of Science degree.
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David Powell
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Re: Reference blocks for calibration

Post by David Powell » Sun May 28, 2023 4:05 pm

A year or so ago I was helping out with an estate sale. Amongst the items there was a completely mint set of Jo blocks, still in their original , again mint case. There was a typewritten note saying that they were made for inspection purposes and NOT to be used for calibration of line machinery. The note added, Made by Johannson for the Ford Motor Company. A machinist relative of the deceased collared them with delight.
Regards David Powell


Jerry VanOoteghem
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Re: Reference blocks for calibration

Post by Jerry VanOoteghem » Sun May 28, 2023 6:17 pm

David Powell wrote:
Sun May 28, 2023 4:05 pm
A year or so ago I was helping out with an estate sale. Amongst the items there was a completely mint set of Jo blocks, still in their original , again mint case. There was a typewritten note saying that they wereMade for inspection purposes and NOT to be used for calibration of line machinery. The note added, Made by Johannson for the Ford Motor Company. A machinist relative of the deceased collared them with delight. Rgards David Powell
Even today, they're made in different grades of accuracy and of different materials. The most accurate sets are inspection grade, or "master sets" and are never to leave the inspection room. "Working sets" are for use on the shop floor. All sets should have their calibration report along with them at all times. Since nothing is perfect, each block may be "off" several millionths of an inch. Big deal, right? Yup, it's a big deal when you have many such blocks stacked up and the additive effect of the error begins to impact the accuracy of your measurements. That's why the calibration record is so important. It allows you to know and to compnesate for the stack-up error so that your block stack has a known dimension, within millionths. I guess that's more than anyone asked for so I'll stop here... :)

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