Hey Pat, hey Don @poppyscott, hey all,
I remember Daniel @PwnCNC offers a 4-pole spindle, unfortunately the spindle shown offers its constant torque of 0.9 Nm only from 12,000 – 24,000 rpm, unlike the Mechatron 4-poles which offer constant torque from much slower speeds. Even my 2-pole Mechatron offers 0.9 Nm from 6,000 – 24,000 rpm.