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Machining guidelines - Drilling

Soft plastics like thermoplastics pose special requirements for the drilling tool. This is something you should bear in mind.

Plastics are poor conductors of heat, and also possess a low melting temperature, plus high expansion coefficients. This means care must be taken to ensure rapid removal of chips, since otherwise there may be overheating and dimensional changes in the boreholes and in worst case the drill may even fracture (jamming of the hot drill).

Machining guidelines drilling

bearbeitungsrichtlinien-bohren
Twisting Angle b to be ca. 12° à 16°
 rohvs
 Setting AngleRake AnglePeak AngleCutting Speed m/minFeed mm/U
PVC 5-10 3-5 60-100 30-120 0,1-0,5
PP,PE-HD 5-15 10-20 60-90 50-150 0,1-0,3
ABS 8-12 10-30 60-90 50-200 0,2-0,3
PMMA 3-8 0-4 60-90 20-60 0,1-0,5
PVDF 10-16 5-20 110-130 150-300 0,1-0,3
PET ca.16 25-30 110 50-100 0,1-0,3
POM 5-10 5-30 90 50-200 0,1-0,3
ECTFE 5-15 10-20 60-90 50-150 0,1-0,3
PC,PPE 8-10 10-20 90 50-100 0,1-0,3
PEEK 5-15 10-15 118 70-100 0,07-0,2
PSU 8-15 10-20 60-90 50-100 0,1-0,4
PES 8-15 10-20 60-90 50-100 0,1-0,4
PEI 8-15 10-20 60-90 50-100 0,1-0,4
GF/mod 6 5-10 120 80-100 0,1-0,3

Note

  • Metalloid cutting tools should sometimes be preheated up to 120 °C
  • Use only pure water with liquid cooling (tension cracks may accur)
  • Amorphous materials should be annealed (do not use oily cooling agents)

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