I bought the Ortur Y-axis Rotary Chuck for Laser Engraver (YRC1.0) a couple of weeks ago and it always got warm to the touch but today it got hot enough it was painful to the touch. After I found out hot it was I was surprised it wasn’t smoking or melting anything plastic. Has anyone else have, or had this problem? I sent an email to Ortur about this but sadly their never in a rush to answer emails unless your buying something. As hot as it got I don’t see this rotary having a very long life.
Then most likely the reference voltage for that axis driver is set too high. Though, stepper motors can safely be operated close to and even above 100 °C. Personally, I like mine staying below 75 °C, but as long as you don’t exceed 95 °C constantly, I’d say everything is fine. But it might be a little uncomfortable to handle such hot devices 
WOW! 100* C!. No wonder it was hot to the touch. 
Did not know stepper’s would get that hot. By your answer it sounds like the voltage is adjustable or did I just misunderstand your comment? Thank you for this information.
They can get so hot. But usually, they shouldn’t. 
On my lasers and rotaries, they get just a little warm. So besides that they can operate at that temperatures, it might still be worth checking why they get that hot.
The driver chips controlling the motors use a reference voltage to set the maximum current they send to the motors. Depending on motor type and size, this is different. If the motor gets hot, this usually means that there is too much current running through the motor. You can adjust it on the mainboard in most cases, but that would also mean that the overall power for the y-axis motor is reduced as well (I guess you switch between y-axis and rotary?).
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