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Valves /
Port holes
Port holes
The large diameter must be created in a drilling operation. Must be machined without vibration to obtain narrow diameter tolerances and perfect surface roughness.
Result
The step drill in pre-form carbide with special internal coolant and center point makes it possible to increase cutting speed.
- Reduced machining time
- No vibration
- Safe process
- Excellent surface quality
- Long tool life
Machining process
Step 1: Solid carbide step drill
Drawing no. 212891/999997, N = 1675 rpm, Fn = 0.4 mm/rev.
Step 2A: UM tap
Drawing no. EH1480.554
Step 2B: UM thread mill
Drawing no. 256938.12x014
See video on machining cast iron valves
