I have a question about the use of a servo motor.
I need to lift a load of $130\ kg$ with two servo motors with $13\ Nm$.
The diameter of the shaft is $Ø40\ mm$, ie, $r=\ 20mm$.
$1\ N = 1\ Kg\ *\ 1\ m/s^2$
$1\ Nm = 1\ Kg\ *\ 1\ m/s^2*\ 1\ m$
$25.506\ Nm = 130\ Kg\ *\ 9.81\ m/s^2*\ 0.02\ m$
By my reasoning, two servo motors could raise this load if the point of application of the load is exactly the diameter of the shaft.
If I use a cable that every time its diameter increases inside a pulley, at some point I will not be able to lift that load anymore?