The most important problems that arises when designing the helical drills is to establish the profile of the helical channel, respectively, to determine the profile of the mill of the second order for it's processing, This can be solved graphically of analytically. In the paper, the cross-sectional profile of the helical channel is determined by calculation for drill with the following characteristics: diameter 20 mm; 2, 8 mm core diameter; top angle 118o the angle of the channel propeller of 30o tooth width of 11, 5 mm diameter of 18, 5 mm back tooth: facet of 1, 75 mm. Also, based on the calculated date, the 3D modelling of the drill body with helical channels and the geometry of the active part obtained after sharpening was performed. Making evident methods and schemes of sharpening and other sharpening of helical drills can be done using 3D modelling Software.