There are numerous types of knives – for fishing, hunting, surgery, and garden works, for kitchen, throwing, or box cutting. There are many piercing and cuttin instruments on the market, which manufacturers are offering. How should we accurately choose between the options and select the one that will satisfy all our needs and serve to fulfill all necessary functions?..

Customer: a plant specialized in the production of equipment for hydraulic, nuclear, thermal, and gas turbine power plants.
Task description: for the first time the manufacturer faced the necessity to make Brinell hardness testing between the second and third stages of the rotor after the hardening. The distance between the stages is 81 mm. The customer's representative did not inform about the hardening depth...