Zaxis Ball screw question

[komatias]

For a Z I would belt drive and reduce to 2:1. As Z motions are not always as long as the X and Y you can live with a slower speed.

The 2:1 will also ensure you do not drop as easily when the motors are off. It may not be a concern of course if you are using bog standard screws.

(I know on my little CNC conversion kits, because I am using ground screws, you can easily backdrive them. Then again the head weighs around 30kg there)

[Neale]

I reckon that my moving Z components weigh around 15kg and that seems OK with 1605 and 1-1 pulleys. However, one of the great things about belt drive is that you can always change ratios if you need to without too much work.

[routercnc]

My Z is also 1:1 with pulleys on 1605 and works fine