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Valves /
Shock valve holes
Shock valve holes
Objective
A fast and reliable process ensuring that the tolerances are achieved in the most efficient way. A typical challenge is to meet the demands for a good surface quality.
Result
One-shot drill with extra guide pads and C7 coating creating a straight hole with excellent surface quality while maintaining high feed and long tool life. The C3-coated thread milling cutter ensures a reliable threading process.
Machining process
Step 1: Solid carbide step drill
Drawing no. 12861/999989, N = 1794 rpm, Fn = 0.35 mm/rev.
Step 2: Thread milling cutter
Drawing no. 256910.12x15
See video on machining cast iron valves
