Page 27 - Demo

25GENERAL DRILLING HANDBOOKThe hole diameter when drilling may be slightly different from the drill diameter. This is because the drill moves away from the hole axis even with minor irregularities.However, at the same time, hole accuracy by drilling depends on many factors related to both the hole parameters and the type of workpiece, as well as production unit.Hole AccuracyHole Parameters Type of Workpiece Production UnitDiameter Hole Depth Interrupted Entering / Exit surfaceMaterial Drill ConfigurationAdaptation MachineHole Diameter Hole DepthPSteelDrill The Stability of The Machine as a Whole and Particular The SpindleHole DepthMStainlessSteelDrill with Indexable InsertsCoolantKCast IronDrills with Exchangeable HeadsDetail ClampingNNonferrousHorizontal or Vertical DrillingSHigh Temp. AlloysPower and TorqueHHardenedSteel