Justification for the feasibility of replacing analog measuring instruments with digital ones at repair enterprises

As compared to conventional analog (universal) measuring instruments, digital tools possess superior metrological characteristics, reduce the likelihood of reading errors, and enable automated data registration. The study aims to evaluate the feasibility of replacing analog instruments with digital ones, targeting a reduction in the limit error by a factor of 1.7-2.0 within the context of repair enterprises. The study examined 1,000 camshafts from YaMZ-236 engines and their corresponding bushings, totaling 4,000 connections. The camshaft bearing journals were of the first undersize (repair size) Ø 0.065 0.105 53.7− mm, while the mating bushings were Ø54+0.03 mm. For the inspection of the camshaft bearing journals, a Dasqua 4105 digital micrometer was selected to replace a lever snap gauge; for the internal diameter of the bushings, a Dasqua 4511 digital three-point internal micrometer (bore gauge) was used. The analysis revealed that replacing the lever snap gauge with a digital micrometer led to a 1.58-fold reduction in the total number of incorrectly accepted and incorrectly rejected parts. Over the entire service life of the tool, the savings exceeded 2,059,000 RUB. The implementation of the digital bore gauge ensured a 2.12-fold total reduction in incorrectly accepted and rejected bushings, with savings exceeding 3,830,000 rubles over the tool’s service life. Based on the economic feasibility analysis of the transition to digital instruments, the authors established that the highest efficiency is achieved when inspecting the internal diameters of bushings with a digital bore gauge. The results demonstrate that implementing these digital tools results in a 1.36-fold reduction in annual losses for camshaft journal inspection and a 1.96-fold reduction for the inspection of bushing internal diameters.

1. Leonov O.A., Lazar V.V., Antonova U.Yu. Calculation of the integral quality indicator of a vertical honing machine for finishing processing of cylinder liners. Vestnik mashinostroeniya. 2025;104(1):7-11. (In Russ.) https://doi.org/10.36652/0042-4633-2025-104-1-7-11

2. Leonov O.A., Shkaruba N.Zh., Vergazova Yu.G., Khasyanova D.U. Justification of keyed joint fits. Problemy mashinostroeniya i nadezhnosti mashin. 2022;6:65-71. (In Russ.) https://doi.org/10.31857/S0235711922060074

3. Leonov O.A., Shkaruba N.Zh., Vergazova Yu.G. Determination of the maximum functional clearances of a plain bearing under hydrodynamic lubrication conditions. Friction and Wear. 2024;45(4):327-334. (In Russ.) https://doi.org/10.32864/0202-4977-2024-45-4-327-334

4. Erokhin M.N., Leonov O.A., Shkaruba N.Zh. Standardization of shaft surface roughness in joints with metal insert rubber seals. Problemy mashinostroeniya i avtomatizatsii. 2024;2:104-111. (In Russ.) https://doi.org/10.52261/02346206_2024_2_104

5. Leonov O.A., Zimogorskiy V.K., Vergazova Yu.G., Antonova U.Yu., Leonov D.O. Instrumental control of defects in the main bearings of the cylinder block. Agricultural Engineering (Moscow). 2024;26(2):65-70. (In Russ.). https://doi.org/10.26897/2687-1149-2024-2-65-70

6. Glubokov A.V., Yastrebova T.S. Problems of automation of the selection of universal measuring instruments of linear dimensions. Measuring. Monitoring. Management. Control. 2018;4(26):37-42. (In Russ.)

7. Glubokov A.V., Glubokova S.V., Emelyanov P.N., Afonina I.V. On the problem of creating an automated system of metrological measurements support for machine building enterprises. Vestnik MGTU “Stankin”. 2023;2:98-104. (In Russ.)

8. Bondareva G.I., Leonov O.A., Shkaruba N.Zh. Justification for replacing indicator heads with digital ones when monitoring the repair of machines. Selskiy mekhanizator. 2022;4:26-27. (In Russ.)

9. Temasova G.N. Tolerance control of shafts in repair production. Selskiy mekhanizator. 2023;8:40-41. (In Russ.)

10. Temasova G.N. Evaluation of defects in repair production: an innovative approach to the control of “shaft” type parts. Vestnik NGIEI. 2024;2:48-58. (In Russ.)