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Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. The individual gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness.
Carl Edvard Johansson (15 March 1864 – 30 September 1943) was a Swedish inventor and scientist. Johansson invented the gauge block set, also known as "Jo Blocks" ("Johansson gauge blocks"). [ 1 ] [ 2 ] He was granted his first Swedish patent on 2 May 1901, Swedish patent No. 17017 called "Gauge Block Sets for Precision Measurement".
Gauge block, (also known as a gage block, Johansson gauge, slip gauge, or Jo block) a precision ground and lapped length measuring standard. It is used as a reference for the setting of measuring equipment used in machine shops , such as micrometers , sine bars , calipers , and dial indicators (when used in an inspection role ).
English: Photo of 36 Johansson gauge blocks wrung together and held horizontally, from a 1907 toolmaking book. The blocks are held together solely by the adhesion of their extremely flat surfaces, which is so strong that it easily supports their weight.
Because Johansson's blocks were so popular, his blocks became the de facto standard for manufacturers internationally, [32] [33] with other manufacturers of gauge blocks following Johansson's definition by producing blocks designed to be equivalent to his. [34] In 1930, the British Standards Institution adopted an inch of exactly 25.4 mm.
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A Johansson Mikrokator (also called Abramson's movement) is a mechanical comparator used to obtain mechanical magnification of the difference in length as compared to a standard. It works on the principle of a button spinning on a loop of string.