Hi Ryan,
I Dont know what speed the Numatic runs at, but to be honest there isnt enough weight to pad/bonnet clean effectively. The ideal weight would be 40-48 kilos in order to "bed" the pad down efficeintly to the carpet.
The ideal speed for this type of macjine would be 170-180 r.p.m.
Lastly, I would opt for a direct drive mechanism over a belt, as the belt tend to expand over time and with the torque of using a rotary machine for this type of process.
Hope this helps!
Regards
Gary