Hey Steve,
haven’t seen Huanyang spindles with Automatic Tool Changer system yet. But Some of theses Spindle Packages that include a spindle, a VFD, a Spindle Mount and a Water Pump have a weight of 18.86 lbs, so maybe it’s a mistake? We should ask the creator of Spindle weight too much topic. My spindle has no ATC and weighs 4,8 kg (10.58 lbs).
Anyway a spindle with Automatic Tool Changing system may well be weighing 9 kg (19.84 lbs).
Would be interested in knowing how the Onefinity’s Z Axis mount deals with this