So i've searched and searched and search and can't seem to find a quantitative answer.

My machine is designed to move .0005" per step on a motor -- I'm hoping this is achievable with ACME screws (~19" long X and Y axis, 7" Z axis)

I've heard inconsistencies can be compensated for via software...but i'm wondering can i expect to maintain this precision with regular 2G ACME screws or will 2C 'Precision' screws be neccessary?

Thanks