When people think of Gage Blocks they think of A.A. Jansson, and for good reason. The Lundquist family started A.A. Jansson back 1961 with the sole purpose of manufacturing gage blocks.
C.E Johansson, the "Father of Measurement", developed and manufactured his first set of gage blocks in the late 1800's. He developed and began manufacturing from his home in Eskilstuna Sweden. Working alongside of him were our forefathers, Sven and Victor Lundquist. Sven Lundquist brought his family and knowledge to Dearborn Michigan in the 1920's, to manage the Ford Motor Johansson Gage Block Division. Sven's Grandsons Arne and Eric started A.A. Jansson in 1961, following in the family tradition of manufacturing and calibration of gage blocks. With five generations of experience you can be assured that the calibration performed at A.A. Jansson comes with the upmost precision in the industry.
The most important feature of a gage block is that it can be joined together with little dimensional error. The process used to join blocks together is called wringing. By sliding two gage blocks with ultra-flat surfaces together the blocks will cling thus creating additional size blocks. An 81 piece gage block set in conjunction with the wringing process, can create thousands of dimensional sizes.
However, blocks will not wring if the surfaces are not flat. At A.A. Jansson each gage block is finely lapped during the calibration process to improve the gage surfaces, enhancing the blocks wringing characteristics. After all, what good is a gage block that doesn't wring? A.A. Jansson the only gage block calibration laboratory in the industry that will actually improve the condition of the gage block during the calibration process.
We check all blocks are for deviation and variation in length. We determine deviation by measuring a specific length across the gage surface and measure at least four additional locations to determine the variation in length of the complete gauging surface. This helps insure the parallelism of the gauging surface
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