Sandvik Coromant Machining carbon fibre materials - Manual (Page 17)

Surface features
Resin
Fibres
Glass cloth •
- a layer of white glassfibre
- glassfibre layers can possibly generate break out
problems such as splintering, although it can help
limit the delamination when applied to carbon fibre
exit face.
Gelcoat •
- a plastic layer
Lightning strike protection (LSP) •
- Al or Cu mesh or foil
- lightning strike protection can potentially rip & tear
on exit. Rather than being cleaned cut it may leave
some uncut copper mesh fibres on the edge of
the hole.
Surface
Geometry
The variation of surface layers and its properties will effect hole exit and edge quality. Therefore,
the geometrical shape of the cutting tool is very important.
Paint •
Erosion-resistant •
- neoprene, metal sheets
Hybrid cloth (glass, Kevlar) •
- white fibres embedded in the fabric
of the external layer
- as the layers have specific demands, its very important
to choose the correct drill point geometry to improve
hole quality.
SANDVIK COROMANT USER’S GUIDE - COMPOSITE SOLUTIONS 17