Originally Posted by
crjohnson
Yep, so what I don't really understand is how some people run 8-9-10amps (when the spindle is only rated to say 6.6amps in the case of Fox's 2.5kW jianken 2 pole), without doing any damage and they plough through material without bogging down.
Fox's spindle ran a 10mm deep x 4mm sidecut and hit 5.7amps max. (20,000RPM). My spindle hits 5amps at only 1.8mm side cuts, same feed rate, same tool and material etc. He then went on to do a 10deep x 8mm side cut and hit 10.4amps without a any bogging down! I would never try that but thought it was impressive and know that my spindle wont get anywhere near that though they are made by the same people and 4-pole vs 2-pole.
Also note I emailed jianken about the amps rating, he said:
"6amps is the current of each wire.
If your VFD shows 6amps, this is the maximum current. In this case, your spindle is working with full load, right? If so, it's OK.
When you set up your VFD about the overload current, usually we make it 1.5 times of the rated/maximum current. "
I'm not trying to say anyone is right or wrong here, just suspious of the difference in performance of these 2 spindles.