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How to create a friction-based cable exercise machine?

My recommendation would be to use an electric generator with an adjustable load. Control the load using feedback from a loadcell and you can create a constant resistance force at any speed (above some ...
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How to create a friction-based cable exercise machine?

Instead of stirring air or water like suggested in the comments you could stir a bunch of beads or powder. That way the torque wouldn't change with speed and also wouldn't have much inertia. Could be ...
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To reduce friction losses, is it better to have one single large ratio stage, or multiple smaller stages for worm gear?

Check out planetary gearboxes as if the load is high then the load is shared on several teeth not just one. Also, space considerations come into play.
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How friction between stator and rotor is dealt with in an electric engine/motor

... there's no space between the rotor and the stator. There is always an air gap between the rotor and stator. Iron has a permeability of about 1000 times that of air so the trick for maximum ...
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