How will I know if I'm getting beyond the limit of the spindle rpm? If I monitor temperature of the spindle and have the machine alarm out at a certain point, can I protect the spindle and keep it within it's limits? I'm not sure I feel safe just trusting that an aliexpress spindle can run at 14k rpm for hours and not eventually reach thermal runaway and blow up. I will be running long programs unattended. Am I safe if I use temp sensors with alarm? I'll be designing my own headstock so i can use a couple sensors and position them right at the bearings.
Also to add to that, can I increase the rpm limit of my spindle with active cooling in the headstock?