Yes no problem milling with 1mm bit if you have highspeed cnc mill (different price class then regular cnc mills). At 1mm, to have suggested cutting velocity on cutting edge of the bit, you need to have more then 10000 rpms and with those rpms good torque/power so rpms doesn't just stall.
So if you try something like that on lower rpm, and have feed rate too big that would mean, bit can't cut, but rather push the material, which it can't , so it breaks. So to compensate you need to go very slowly ->milling one block for hours->too expensive
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