So I use a speed control on both my machines and whenever chatter got nasty I would just move the speed a bit, with either my $20 660 controller or the speed control on the 611.
Seeing AvE bust out this little hack made me realize what the heck was happening.
So know we really need the PID speed controller so we can add in a non stable RPM so we can cut faster. Any EE’s out there have some ideas for the mains power control? The controller (arduino?) side will be easy, I think.
PCB link … https://easyeda.com/allted/pid-va