I have a VTC-41L that I purchased and when the machine is on it is constantly hissing air inside the spindle. I remember when I got my Hurco BMC4020 it did the same thing and I was able to go into parameters and shut that off (I only machine aluminum typically).
Anyone happen to know the param for this? OR is this not a thing on these machines?
...don't think you really want to turn OFF the Spindle Air completely because, this positive air pressure keeps the Coolant/chips out of the spindle bearings...I would just look for the Air Regulator that controls the pressure and tune it down to save air.