Hi Andy
Yes 2 phase DC. I had an idea wrong wiring would change direction. I've had one apart, no electronics inside. Also read about earth loops. Signal electronics and electrics are in 2 separate metal cases. Also graphite rings around heavy voltage wiring.
Progress report: Mechanicals complete except for minor tuning of linear rails on Y axis. Electrics 98% complete. To do list. Touch up scratched metalwork, Download software onto computer, program Uno card. Commission and decide on engraving software. Looking at Desktop V Carve.