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Hi OrionCAM,

there are many factors involved in calculating the slip threshold, so I do not know a formula. I thought this would be good for 3D printing because of the low forces required. I do not think it would perform well in a cam situation. A Mister Park from Korea had an interesting twist where he used the bearings to ride in the valleys of an ACME thread. perhaps you can look him up on thingiverse. In any event It would probably work best for milling non metals using larger diameter hardened rods and not too much pitch.Tthey are cheap to produce. you can experiment if you like.

Thanks for the comment
Msollack