The distance between bearing connectors in crosscutting machines should be chosen with allowance for their position on the drill rod and the length and angle of inclination of the borehole.
Due to its interaction with the sides, in a sloping borehole a drill rod without bearing connectors has a stable free length which much exceeds that of a drill rod in a vertical hole.
In drilling boreholes up to 300 mm in diameter in thin coal seams with SBM-3u drilling machines, one can dispense with bearing connectors.
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G. M. Sarkisov, Mathematical Analysis of Drill Pipes [in Russian], Gostoptekhizdat, Moscow (1944).
DonUGI, Donetsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 51–56, March–April, 1969.
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Aleinikov, A.A. The stability of the rod of a crosscutting drill in an inclined borehole. Soviet Mining Science 5, 149–153 (1969). https://doi.org/10.1007/BF02501892
- Lateral Force
- Slope Side
- Free Length
- Drill Pipe