I'm looking for a very slow motor. Like half a round in a second, or even less. The movement must be as fluid as possible. I don't care about velocity variation on start or on stop, but I care about the constant velocity.
I've tried with a small DC motor, powering it with both 5V and 3V and a 5 and 10 kohm potentiometer but slowing down after a while it does not move anymore.
I think that I need to use a full velocity DC-motor with some reduction gear but I don't know how to get the right ones. Can someone advice me some pre-made gear set for very low-velocity motor or at least how to calculate them and try to make by myself (3D printing?)
EDIT: no particular torque is needed, I'd like to rotate really light object (lddd then 100g)