Page 214 - Demo

212 ISCAR DEEP HOLE DRILLINGCircularityThe geometric quality of bores obtained from deep hole drill bits is clearly higher than that obtained with the use of twist drills. It is possible to obtain precision with deviation of less than 4 %u00b5m (160 %u00b5inch).Concentricity and StraightnessThe result quality depends on different factors such as:%u2022 Drilling depth (Figure 6.1.3)%u2022 Drilling diameter%u2022 Type of machining and cutting parameters%u2022 Quality and uniformity of the workpiece material%u2022 Machine tool conditions%u2022 Gundrill support (when using gundrill)Figure 6.1.30.16500 mm0.330.50,660.841.01000mmDrilling Depthstationary workpiece %u2013 rotating toolrotating workpiece %u2013 stationary tool0.10500 mm0.160.20750mm250Drilling Depth