CoroMill® 300 - Light cutting face and profile milling cutters
Helical ramping of larger diameter holes with CoroMill® 300 provides the most secure and productive method here. The cutting forces are much lower than drilling, which also struggles with the interrupted exit into the bore.
For rough milling around a boss, use CoroMill® 300 with a roll in programme combined with round inserts to reduce notch wear and allow high feed rates.
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