Purpose. Modernization of the technical solutions to improve the removable diamond rock-breaking tools taking into account the various stages of wear out of diamond bits. Methodology. The methods of mathematical modelling and comparative analysis were employed in the research, experimental study was carried out. Findings. The bar rigged shell has been proposed that contains an outer pipe, a shoe with grooves, a retrievable core receiver with a core catcher adapter linked with the removable telescoping drill bit consisting of drill bit members, arranged according to the collet's sectors, there are cants on its internal surfaces. The lugs have been made on the outer cone of core catcher, and there are longitudinal grooves on an internal surface of cants sectors. When changing the position of the drill bit from transport to operational position, the lugs and grooves interact with each other, and in the working position of the drill bit lugs through grooves on collet sectors interact with the shoe grooves. Originality. The analysis of the research showed the following: the greatest efforts for rotation of drill bit from the transport to operational position and back are in the angular range of 75 - 90<^>o, i.e. in the final and the initial stages of the corresponding operations. The bearing springs influence greatly on the effort of the drill bit rotation. Because of their consecutive operation, the efforts step change depending on the turn angle of the drill bit. Practical value. The values of the calculated efforts suggest a possible mechanism for the implementation of the structural removal and installation of a removable diamond drill bit with the diameter of 59 mm inside the drill. To expand the rational use of removable bits it is necessary to complete the SRK-76 with the pilot drill bits and sectors, which are similar to the type of the diamonds grains, matrix and geometry of the end to the diamond bit of serial-type SSK, and special attention should be paid to increasing the wear resistance of the pilot part of the sectors at greatest wear out. The use of removable bits is the most expedient as the shells part with removable core receivers.

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