Conclusions
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1.
Steel calipers of the TsNIITMASh system, whose hinge has an adjustable clamping pressure, meet completely the precision requirements in testing 200–700 mm hot forgings made with tolerances specified by GOST (All-Union State Standard) 7062-54.
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2.
Duralumin calipers of the TsNIITMASh system with a relaxed pressure on their hinge meet the precision requirements in testing 700–1600 mm hot forgings made with tolerances according to GOST 7062-54.
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3.
Measurements of 700–1600 mm dimensions with calipers of the TsNIITMASh system are always more precise and stable than those made with factory calipers. The negative systematic measurement error of the TsNIITMASh calipers is virtually constant and small, since their measurement effort varies within narrow limits.
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Literature cited
O. D. Bychkov, Izmerit. tekhn., No. 8 (1967).
O. D. Bychkov, Izmerit. tekhn., No. 1 (1966).
O. D. Bychkov, Author's certificate No. 175243, Byul. izobr., No. 19 (1965).
GOST 7062-54 on “Carbon and Alloyed Steel Forgings Made in Smith Forgings on Presses. Allowances and Tolerances.”
O. D. Bychkov, Kuznechno-shtampovochnoe proizvodstvo, No. 8 (1965).
Additional information
Translated from Izmeritel'naya Tekhnika, No. 12, pp. 10–13, December, 1967.
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Bychkov, O.D. Calipers for measuring and investigating large blanks. Meas Tech 10, 1461–1464 (1967). https://doi.org/10.1007/BF00981277
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DOI: https://doi.org/10.1007/BF00981277