Owner's manual
Hole requirements
Stacked materials
Common demands•
- Cpk>1,33
- Ra<3,2 in carbon bre
- Ra<1,6 for Aluminium and titanium
- Hole tolerance: +/- 20 µm to +/- 40 µm
- No delamination or chipping in the hole exit
- No chip erosion on the carbon bre from the metallic stacked material
Criteria•
- Chips evacuation
- Lubrication through the center
Dimension control•
- Holes are commonly pre-drilled
- Finish hole size produced with one shot solution if possible
- Reamer to be used when high demands on nish and size control
Holes are usually measured as diagram shows above every 90 degree
Material 1
Material 2
2 mm in from Entrance
Middle of material
2 mm from Exit
2 mm in from Entrance
Middle of material
2 mm from Exit
SANDVIK COROMANT USER’S GUIDE - COMPOSITE SOLUTIONS 25