Page 224 - Demo

222 ISCAR DEEP HOLE DRILLINGPoint Angle LocationISCAR standard products define a point angle location at a quarter of a drill diameter relative to the drill center axis (Figure 6.5.2.3). Changing the position of the point angle has a direct effect on the drilling process.Approximating the position of the point angle to the central axis of the drill will cause good straightness, undersize hole, long chips, more power load (Figure 6.5.2.4).Moving the position of the point angle from the central axis of the drill will cause better tool life, oversize hole, and bad straightness (Figure 6.5.2.5).Figure 6.5.2.30.25DFigure 6.5.2.4less than 0.25DFigure 6.5.2.5more than 0.25D