Centering ejector pins

Bohre brand ejector centering pins

Core drills are considered the most suitable tool for drilling holes of diameter from 11 to 150 mm in various materials, including structural steel, stainless steel, cast iron of different grades. 

The use of a pilot guide pin completely solves alignment and positioning problems. The tip of the pilot, entering the alignment hole or recess, eliminates radial runout. Drilling is performed accurately with the set center.

In the process of improving core drill bits with the help of pilots, another problem was solved - tool cooling. The back end of the pilot serves as a valve that opens the coolant channel inside the drill bit. In addition, when the drilling process is completed, it pushes the rest of the workpiece out of the tool cavity. 

Thus, in modern equipment, the pilot has three functions:

  1. Centering
  2. Switching the coolant on and off
  3. Removal of the workpiece fragment from the inner cavity of the core drill bit.

The process of performing these functions is shown schematically in the figure below:

Pilots are made of hard steels that provide minimum wear. When selecting this element, its compatibility with the specific type of core drill bit as well as the drilling conditions (depth) must be taken into account.

Benefits

Geometry

Unique sharpening and bohre™ geometry ensure efficient and accurate positioning of core drill bits

Universal
Quality, hard steel
  • Geometry

    Unique sharpening and bohre™ geometry ensure efficient and accurate positioning of core drill bits

  • Universal
  • Quality, hard steel
  • Unique sharpening and bohre™ geometry ensure efficient and accurate positioning of core drill bits

  • Universal

  • Quality, hard steel

Ejector pins for core drill bits

Item number Product name
00006057 Пилот 6,34х77
00006056 Пилот 6,34х103
КБ001320 Пилот 7,98х77
К0006237 Пилот 7,98х90
00006065 Пилот 7,98х108
00006064 Пилот 7,98х157 (двухсоставной)

Рекомендации по применению выталкивающих штифтов

  • Пилот 6,34х77 используется для корончатых сверл из быстрорежущей стали (HSS) глубиной 30 или 35 мм
  • Пилот 6,34х103 используется для корончатых сверл из быстрорежущей стали (HSS) глубиной 50 или 55 мм
  • Пилот 7,98х77 используется для рельсовых корончатых сверл с напаянными твердосплавными пластинами (TCT) глубиной 25 или 30 мм
  • Пилот 7,98х108 используется для корончатых сверл с напаянными твердосплавными пластинами (TCT) глубиной 50 или 55 мм
  • Пилот 7,98х157 (двухсоставной) используется для корончатых сверл с напаянными твердосплавными пластинами (TCT) глубиной 75, 80, 100 или 110 мм

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