2.2KW Spindle with Half Inch Cutters?

[gmack (Gerald Mackelburg)]

@LiamN

Once the spindle reaches breakdown torque is when things get interesting, there’s a bunch of different ways the VFD can respond, from momentary over-current, through re-start attempts to throw alarm and shut down.

Don’t HY VFDs just use the adjustable motor over-current threshold to trigger these events?

@LiamN

I’ve used drills in the 1,500 to 2,500 RPM range and there’s no lack of torque from the 2.2kW spindle. The limit I’ve hit so far is machine rigidity, at 8mm dia in 6061 Aluminium the dril just starts to chatter horribly and bounce the whole spindle around, I’ve not found any combination of speed and feed rate that behaves nicely at that size yet.

Have you tried drilling endmills?