Originally Posted by
ger21
If you have a round spindle, the fan is not really a fan, but more of an impeller, and should not be directional. So I don't believe that it will cool differently running in the opposite direction.
If the spindle is setup improperly, then no fan is going to keep it from burning up. Neither is water cooling.
I have run two spindles from my VFD, using the factory settings as specified in the manual, with no issues.
PD007 = .50
PD009 = 13
PD010 = 6.5
While testing, I've had PD011 set to 100 and it runs fine with no load, and doesn't get hot. BUt it probably doesn't have much torque at that speed, and if you overload it, you could cause damage. So I'd recommend setting it to 130.
It sounds like you need to learn how spindle control in LinuxCNC works, and set it up properly. I've never used it, so can't offer any help there.