(1) Machining deep holes with nesting cutters; (2) The extended handle Fried Dough Twists drill is processed on a general machine tool; (3) Using deep hole drills for processing on specialized deep hole drilling machines.

1、套料刀加工深孔。孔径较大的深孔(一般直径大于50mm)宜采用套料刀加工。这种方法切削负荷减轻，从而提高了生产率，减少了材料消耗。所用套料刀，当直径较小时，多采用整体焊接式，直径较大时，可采用装配式或可调式。刀具上应装置用于导向的耐磨镶条，其材料可为夹布胶木、硬质合金、滚动轴承等，刀刃设计上亦应考虑分屑和断屑。它也适合于批量生产。

1. Machining deep holes with a nesting cutter. Deep holes with larger apertures (generally larger than 50mm in diameter) should be processed using a nesting cutter. This method reduces cutting load, thereby improving productivity and reducing material consumption. When the diameter of the nesting knife used is small, it is mostly of the integral welding type. When the diameter is large, it can be of the assembled or adjustable type. The cutting tool should be equipped with wear-resistant inserts for guidance, which can be made of laminated rubber, hard alloy, rolling bearings, etc. The blade design should also consider chip separation and breakage. It is also suitable for mass production

2、接长柄麻花钻在通用机床上加工。接长柄麻花钻就是在普通麻花钻上焊接长柄。由于钻削时轴向力大，钻头两刃不易磨的对称，钻头横刃修磨质量不易保证，而且刀杆刚性差，所以加工时易发生振动，孔的线易产生偏斜，由于钻头容屑空间有限，为了排屑和冷却刀具，必须在加工一段长度后(一般5~10 mm)即把钻头退出。对于轴心孔较长的主轴，要采用从两端钻孔的方式。因此这种深孔加工方法质量差，生产率低、劳动强度大，但由于其刀具制造简单，可使用通用设备，因此在单件小批量生产中应用较多。

2. The extended handle Fried Dough Twists drill is processed on a general machine tool. The extended handle Fried Dough Twists drill is to weld the long handle on the ordinary Fried Dough Twists drill. Due to the large axial force during drilling, the two edges of the drill bit are not easy to grind symmetrically, and the quality of the horizontal edge grinding of the drill bit is not easy to ensure. Moreover, the rigidity of the tool bar is poor, so vibration is prone to occur during processing, and the centerline of the hole is prone to deviation. Due to the limited chip capacity space of the drill bit, in order to remove chips and cool the tool, it is necessary to exit the drill bit after processing a certain length (usually 5-10 mm). For spindles with longer axis holes, drilling should be done from both ends. Therefore, this deep hole machining method has poor quality, low productivity, and high labor intensity. However, due to its simple tool manufacturing and the use of universal equipment, it is widely used in single piece small batch production.

3、采用深孔钻在专用深孔钻床上加工。采用深孔钻加工深孔较好的解决了深孔加工中刀具引偏、刀具冷却和断屑排屑等问题，明显地提高了加工质量和生产率。可加工到10~30 的深孔。深孔加工机床，可采用专用的深孔钻床，也可对普通车床进行改装。

3. Using deep hole drills for processing on specialized deep hole drilling machines. The use of deep hole drilling to process deep holes effectively solves problems such as tool deviation, tool cooling, and chip removal in deep hole processing, significantly improving processing quality and productivity. Can process deep holes up to 10-30. Deep hole processing machine tools can use specialized deep hole drilling machines or modify ordinary lathes.