a negative trendgold
The graph of the dependence ( Figure 9 ) of the depth of cut ap on the mass flow of the abrasive and the inclination angle of the cutting head at the mean value of v f (200 mm·min −1 ) shows a positive trend of ap when increasing the m a value from 20 to 50 g·min −1 and a negative trend of the a p value when the cutting head tilts away from the vertical.