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It's obvious is mm Min. How can it be 117 meters a min? The fastest rapids out there are in the region of 60 mtrs a min. Even if it was inches it would be nearly 3 mtrs a min, Its obvious its not...

There are exactly zero limits.
Dan Gilabert made a 1 micron lathe.

My lathe has 1 micron mechanical resolution and positioning ability.
It is not natively accurate to 1 micron, but I can move by...

Serious professional builds usually have intermittent oil feed to the nut, this not only lubricates but keeps the screw and nut clean as the oil carries away any dirt.

Check your stepper to shaft coupling isn't slipping, and that the end float control bearing isn't moving, the best way is disassembly and reassembly as "Looking OK" has often proven misleading to...

Without a jig, it's not worth it. Even with a jig, you're likely to struggle to get the accuracy required to get all the cutting edges even enough to ensure they all cut equally.

If you are...