Page 245 - Demo

243DEEP HOLE DRILLING%u00bd%u0009Calculation of Tube Length for BTA and DTS MethodsWhen drilling using the BTA or DTS method, the required pipe length should be calculated according to the following description.Drill Tube LengthL = L1 + L2 + L3 + L4 - L5L = drill tube length L1 = oil pressure head lengthL2 = drilling depth (L2%u2019 + L2%u201d)L3 = bar rest/vibration damper lengthL4 = drill tube clamping length LsL5 = end of drill tube to tip of peripheral insertNote: Drill tubes with different lengths compared to standard drills, are availble upon request.workpiece drill headL5L1 L2%u2019 L2%u201d L4L1L3drill tubebar rest/vibration damperoil pressure bar clamphead