The data in the tables are for proffesional machines that can handle that, basicaly it's not a problem for tool going that deep if you start from the side because every part of the tool is cutting, the problem is only in machine itself if it can handle to keep the rpm and not vibarate too much, so with powerfull & rigid machine no problem going up to 1.5mm* diameter deep. But remember the suggested rpm for smaller bits, this is the problem if you can't have those high rpm's with good torque, then you must go slower and in smaller depth steps.
Too slow is not a problem at all
Two(three) blade bit are usualy for ment for long chanell milling, and they can all handle drilling (milling in Z direction)
Four or more blades bits can be also used for chanell milling but for going in Z direction the must have front tooth to the center of the bit (I hope you understand what I mean - if not I'll take pics), but primary use for those are face milling going from side to side like you can see on the second acad picture (Parameters for smooth face milling, with end mills)
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