low friction pulley for thrust stand

huangyhg

low friction pulley for thrust stand
i am in need of a relatively small, very low friction pulley.  it will be used to calibrate a thrust stand in real-time.  i saw an old thread on here that was talking about the same thing but it was closed.
think about setting up your thrust stand to have the thruster oriented vertically.  calibration then requires just placing/removing a mass (and knowledge of local "g").
but, you are probably working, as i once did, on an existing thrust stand.  
you have to determine whether this is a thrust load application or radial load before you buy any bearings....
you can get low-friction, radial capacity, or thrust capacity.  not all 3 in same bearing unless load is very low compared to the bearing rated load.  
air bearings have zero friction for all practical purposes.