Case Studies

Deburring Bores in Composite Aircraft Parts

Posted on: March 7, 2018
Tags: COFA, Aerospace, Deburring, Composite
deburring composites
The image shows on the left the bore entry and on the right the bore exit before deburring.

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There are two major challenges to machining composites: one is to cut the fibers neatly without fraying; the other is that the abrasiveness of the material leads to heavy wear on the cutting edge of the tool blade. HEULE worked with this aircraft manufacturer to develop a cost-effective solution (a tool with a long blade life) that would also deburr the bore neatly. 

CNC machining composite aircraft parts

Application details

  • Bore-Ø: 4.81 mm
  • Material 1: CFRP (Carbon fiber-reinforced plastic)
  • Material 2: GFRP (Glass fiber-reinforced plastic)
  • Machine: Mori Seiki NV5000 / 4 Axis Milling Machine
  • Processing: Vertical Machining
COFA back bore deburring tool


HEULE developed a special tool based on the COFA C3. The carbide blade has a cutting geometry that is optimized for composites and is coated.

Machining parameters:

  • Speed: 2000 U/min
  • Feed: 0.04 mm/U
deburring carbon and glass composites
The picture on the left shows the bore entry and on the right, the bore exit after the deburring.


The customer is satisfied by the deburring result and by the tool life of the blade.


Interested in a COFA deburring tool? Visit the COFA product page for more info. 

Need help selecting a tool? Visit our online Tool Selector and go to the Locate Agent page on our website to find your local technical sales representative. For more assistance, contact us at or 513-860-9900 and we'll be happy to point you in the right direction.