How do I choose the pitch for milling a hole on a machining center with helical interpolation? How many round inserts and how many 90° square-shouldered inserts are used? Does it matter if the holes a

How do I choose the pitch for milling a hole on a machining center with helical interpolation? How many round inserts and how many 90° square-shouldered inserts are used? Does it matter if the holes are pre-drilled or not? This you ask SANDVIK they are the most professional, I also used R490, and R390 inserts, used to know its advantages! The R490 blade is not bad for the price, it can be used with 4 corners, less cutting force than other four corner blades, very high finish, no vibration. If you choose better than this, it is necessary to choose the new milling cutter of the three high, R390 is out of the product, poor economy, cutting volume is large with tremor, as for the radius of the choice of how much is based on the back of the blade angle and slope angle, slope length has a relationship. The depth of cut is basically 3MM, the slope angle is basically 2 degrees, (the maximum can not exceed the back angle of the insert) with round inserts, it is best to hit the hole in the middle, in order to chip, and to avoid symmetrical cutting, this you should understand, round inserts are more suitable for heavy cutting slope to go milling, because of the back angle is large.