I want to know how much I can over-drive a small electric motor. Its speed at the rated voltage is too slow, so I want to find a higher voltage that won't blow it. It will only be used intermittently, but I figure if I run it for 100x the max expected duration with the expected load then it will probably survive repeated intermittent use.
So my question is, safety concerns aside, how can I apply a relatively constant load? I can't think of a reliable way of using friction, such as attaching a disk and hold something on it, vaguely resembling a vehicle brake disk. I could attach a weight via a pulley but it would quickly run out of length. I could use a second motor and load that electrically to increase the torque, which is IMO the best idea, but I'm wondering if there are any other mechanical solutions? I think I'm missing something really obvious.