Step chip dividing groove deep hole drill

A stepped chip-separation slot deep-hole drill relates to a stepped chip-separation slot deep-hole drill used on a radial drill press to process deep holes; the deep-hole drill solves the problems that the NC deep-hole drill press has high cost in processing deep holes on the steam turbine low-pressure pressurizer tube sheets and the ordinary deep-hole dill can not ensure the processing accuracy on the ordinary radial drill press, and the two adjacent holes can be easily penetrated. A tail handle (1) is integrally produced with an aiguille (2); and a chip-separation slot (2-2) and two steps (2-1) are sequentially arranged on the external surface of the aiguille (2) from the top part to the root part. The stepped chip-separation slot deep-hole drill has the advantages of low processing cost and smooth chip separation and can ensure the processing accuracy.