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Having accumulated a decent amount of ordinary end mills from the P6M5 quick cutter, I thought about the fact that they quickly become dull, and it is almost impossible to sharpen such cutters without a specialized machine. Therefore, I decided to get a tool with interchangeable inserts, as a minimum, for processing large metal planes, and use end mills only where they cannot be dispensed with.
In principle, there is already a home-made fly cutter with interchangeable plates for processing, but it has its own disadvantages: strong shock loads and low machining accuracy due to impact entry.
As a result, I ordered APMT1135 M2 VP15TF replacement inserts and the most budget cutter BAP300R-40-22-4T. But the manufacture of a mandrel for her will be discussed in this video. For manufacturing, I chose steel 40x, I had not tried to process it before. As a result, I regretted it 10 times during processing, but brought it to the end and got a good tool.