Processing materials for aluminum parts, unilateral processing allowance of 0.7 mm, four blade is indeed higher machining accuracy, but the row cutting than the three blade almost
When machining holes, the machining allowance is large, and the final accuracy is not requiredSelect three edge milling reamerThree blade positioning accuracyGood chip handling capacity
Since it is reaming, choose three blades. Black holes make sense.
Reaming should be four edged reamer, because it is finished, and the blade is a little better
