I made a trial milling with 500W air cooled spindle (12000RPM). Did a roughing first with ok result. Then installed ball end bit (R=1mm, short one). feed rate was 1500mm/min on oak (also tried on pine). Z is lowered 100mm below the most upper state. Please check attachment for details of hardware.
The vibrations were awful, like I needed to hold the bottom of router with hand, otherwise during passage the bit could do a 1mm circle movement due to kind of resonance vibration. Vibration seemingly comes from the bit interaction with material. Bit itself is centered well and it’s spinning perfectly on no load.
On youtube I saw so smooth operation where bit is going easily along the material but here it’s absolutely not like not like that. I am even afraid to run one more time to take video for you to avoid possible damabe to bit or machine.
So, is it not enough wattage on spindle? Not enough RPM?
Thanks for possible suggestions.