Sumitomo Electric Hard Metal Carbide Coated Drill for Steel / Cast Iron Machining Multidrill MDH (Internal Coolant Type)

With the effect of the original new thinning shape "RP thinning", chip evacuation is improved, which significantly reduces the machining load and enables stable machining even under high-efficiency conditions. Optimized unique cutting edge geometry suppresses stress concentration and improves chipping resistance. New grade ACH70: Achieves stable machining under a wide range of cutting conditions by adopting a new PVD coating "HF Coat" that achieves both wear resistance and fracture resistance.
Drilling of steel and cast iron
*Use with internal lubrication. It can also be used for MQL processing. *Keep drill run-out below 0.02 mm. *If abnormalities such as abnormal noise or vibration are observed, change the cutting conditions according to the situation. *Avoid getting the flute into the holder. * If the chamfered part of the machined part has an irregular shape (slanted, intermittent, etc.), reduce the feed amount at chamfered to about half. If it is still not possible to secure machining stability, we recommend pre-machining the flat surface with the Flat Multi-Drill MDF type. *If intermittent machining is required during penetration, reduce the feed amount to about half of that before penetration.