[FrankJ]

Keep in mind the even the CIMs have a pretty short duty cycle even when running at rated speed. Run any of the FRC motors at full voltage and stall and you will rapidly overheat and smoke them. The CIMs and their smaller relatives do better because of their greater thermal mass & reliance on conduction rather than convection for heat transfer. The motors with stall currents > 40amp will eventually cause the breaker to chatter or the speed controller to pull back the voltage to the motor (Assuming the speed controller has that function built in).

So if you are using any brushed dc motor for positioning you should keep this in mind. If it takes more than 20%-40% percent of the full voltage stall current to hold the position, you are going to rapidly overheat the motor. For motors than use fan cooling consider ducting one of the KOP fans to help with cooling