What is the lead on the screws? (1 turn = travel distance?)
DO NOT attempt to do ANY climb milling with manual ball screws.
I personally would convert back to CNC using a Centroid Acorn board, if that's not an option and the screw lead is not large, make new handles or handle adapters and leave the ball screws alone.
Both X and Y ball screws travel 0.200"/ turn. These have double nuts that pre-load the screws, which as I understand it provide some resistance to movement when milling. The preload can be adjusted by changing the width of the spacer between the nuts. I'm just a hobbyist so I may be incorrect about the latter statement.
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