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
КБ010057 Ejector pin 6.34x77
КБ010056 Ejector pin 6,34х103
КБ010873 Пилот 6,34х155
КБ001320 Ejector pin 7,98х77
КБ010237 Ejector pin 7,98х90
КБ010065 Пилот 7,98х105
КБ010064 Ejector pin 7,98х157 (двухсоставной)

Recommendations for the use of ejector pins

  • Ejector pin6,34x77 is used for core drills of high speed steel (HSS) with a depth of 30 or 35 mm
  • 6,34x103 Ejector pin is used for core drills of high-speed steel (HSS) with depth of 50 or 55 mm
  • 7,98x77 Ejector pin is used for core drill bits with soldered-on carbide inserts (TCT) of 25 or 30 mm depth
  • 7,98x108 Ejector pin s used for core drill bits with soldered-on carbide inserts (TCT) of 50 or 55 mm depth
  • 7,98x157 Ejector pin (double-piece) used for core drills with soldered-on carbide inserts (TCT) of 75, 80, 100 or 110 mm depth

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