Need Help!- cmm actuator for cnc router

[sail4too2003]

Hi new at this. It's going well, question is I came across a linear actuator from a unknown 36" cmm. Very cool set up with a roller on the bottom of housing, a flat on the rod that runs on said, roller and a friction wheel on the top with ajustment. This is a very smooth movment and takes alot of pressure to make it slip. It has a v-belt pully I can remove and install timming pully. Has anyone ever used anything like this and if so, is it a good option. I have ball screws that will fit. Which would be the best direction to go? Also this is an old microscope inspection machine with strange linears, they to are tight and smooth. The y is supported with bearing on bottom that runs on a rail. Am I barking up the wrong tree?

[FandZ]

Microscope converted to a cnc, there's a thought I'd go with the ball screw. The other reminds me of a rack and pinion setup. Chancing a slip sounds dangerous to me. besides, what if it has small slips while it's machining and ruins your part.