Sandvik Coromant Machining carbon fibre materials - Manual (Page 24)

In composite materials, there can be loss of hole •
quality long before tool failure
Therefore, the hole quality determines when the tool •
needs to be changed or indexed.
Typical hole quality demands •
Typical requirements in the aerospace field:
- roughness Ra < 4.8 µm
- delamination <1 mm over the diameter
- no splintering
- c
p
on hole size >1.6
Hole requirements
CFRP materials
Maximum delamination area,
<1mm over hole diameter
SANDVIK COROMANT USER’S GUIDE - COMPOSITE SOLUTIONS 24