My 6040 CNC | 6040 CNC FINAL VIDEO 7, Z Axis drive coupler issue @rickcperry | Uploaded November 2018 | Updated October 2024, 9 hours ago.
This is the last video in the series describing an issue with the spindle nut upgrade on the China 6040 CNC machine. You will have to purchase a new solid nut and drill for your new stepper motor.

Special thanks to Vince at eDealers Direct...