aPerm National Research Polytechnic University, Perm, Russia
bZAO Novomet, Perm, Russia
Correspondence to: *e-mail: svirshchev_vi@pstu.ru
Correspondence to: **e-mail: savlov@novomet.ru
Correspondence to: ***e-mail: alexxx-l@mail.ru
Correspondence to: ****e-mail: shakirovjob@gmail.com
Received 24 March, 2018
Keywords: machining efficiency, nipple, submersible electric motor, CNC machine tools, elementary surfaces, surface shaping
DOI: 10.3103/S1068798X19020096