I'm running two TB6600 on my X axis and one AM882 digital drive on Y.

I ran a job for 45 minutes. This job was heavier than what I usually do. 3d adaptive cleaning with a 1/2 ball cutter, 3/16 DOC at 130IPM.

While the job was running I monitored the temperature of the steppers. The ambient temperature was 21 Celsius.

At the end of the job, the Y motor was at 36 Celsius which is good, but the X1 at 51 and the X2 at 54.

Are the X stepper running too hot? I will have more jobs like this one to run so is it time to speed up my digital drive research?

What is the safest temperature to run stepper motors?

Thanks