Choose tough carbide substrates with higher cobalt content instead of wear-resistant brittle fine-grain grades. Apply 0.02–0.06 mm edge honing to disperse impact stress, and add a tiny negative chamfer at the corner to strengthen the vulnerable outer cutting tip. Adopt neutral or slightly negative rake angles to avoid overly thin sharp edges prone to fracture; select roughing-oriented inserts with thickened cutting edges rather than finishing types.

Cut down feed rate by 20% to 40% first to decrease instantaneous impact when the insert engages and exits the material. Reduce cutting speed by 10% to 20% to mitigate thermal fatigue caused by alternating high temperature and air cooling. Adopt peck drilling for deep holes to split cutting loads, and program gradual feed ramping when entering interrupted areas to prevent sudden full contact shock.

Minimize tool overhang to lower bending vibration. Use heat-shrink or hydraulic tool holders to control tiny runout, and check insert clamping tightness regularly. Fix the workpiece firmly with auxiliary supports for thin or unstable parts. Keep the height of center and peripheral inserts consistent, and inspect spindle taper and bearing wear to eliminate persistent radial runout.

Use through-tool high-pressure coolant to continuously wrap cutting edges and relieve thermal shock. Maintain emulsion concentration at 8%–12% to improve lubricity and inhibit built-up edge, which often tears insert edges when peeling off. Direct coolant flow to both central chisel edge and outer peripheral inserts for balanced cooling. Dry machining is not recommended for interrupted drilling.

Drill a small pilot hole in advance for cross holes and inclined surfaces to stabilize the main drill bit and buffer entry impact. Remove hard casting scale, welding slag and hardened surface layers before drilling to avoid point crushing impact on edges. Replace inserts promptly once slight flank wear appears; worn or micro-chipped inserts will suffer severe damage quickly if kept in operation.