Martin, you need to keep this in perspective, I think. Rapid metal turning on CNC machines usually puts a very heavy load on the bearings, because production time is expensive and therefore must be used as efficiently as possible. Your Arundel lathe is unlikely to ever have seen such loads, plus it's a wood turning lathe. Any lathe will get warm after some time, if for no other reason than the motor not having 100% conversion of electricity into motion. The best motors have around 90%, and often you'll find efficiencies of 70%. On a 1kW motor that means 300W go into heat, so nothing strange here. If there are specific parts that get hotter than others, and rapidly, then I would worry.
