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17% OFF Conjunto de 32 blocos padrão métricos em aço Grau 1 Slip Jo Blocks 1.005-50mm Jogo de blocos padrão Ferramentas de medição US$86.99 US$104.99 View It

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BG372241214 19/11/2020

Received as promised. Good packing and nice wooden box to keep them in. Anti-rust wrapping and individual test protocol in every box. Wring together after cleaning an some "wrist polish" which indicates good surface finish. Tested in an old C E Johansson test rig and found no errors. I trust the calibration sheet with its less than half a micron deviations. That is a lot better than I will ever need. The total deviation between one 50 mm and sum of 30+20 mm is around 0.7 um and most of that error is probably in the worn test rig. Very satisfied.

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BG372241214 I brought out a better tool to check the gage blocks. Also cleaned anvil and base.

It turned out that the sub um tolerances were VERY narrow. Difference between 50 and 20 30 mm combination is actually around 0.30 micrometers. Or 30 nanometers. A tiny fraction of wavelength of red (Na) light.
Next step is to get myself a high quality optical flat and look at the moirée pattern. Ridiculous? Yes, but intriguing.
Resposta 25/11/2020

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BG372241214 Read 0.030 micrometers!
Resposta 25/11/2020

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