Stepper Temperature

Is there a way to determine if your steppers are running too hot? Any guidelines on how hot they should run? I purchased a "package" from ebay. The power supply and gecko drives were alll mounted on an aluminum plate complete with heat sink. However, the motors do not have any ratings on them. No text whatsoever. I can reduce the current to the windings but that will reduce my torque and I'd like to keep it as high as I can without overheating the motors. Any comments are appreciated.

TIA

Scott



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