I've posted a basic wiring diagram but the post is waiting to be approved.

The arduino is an analogue signal between 0-5v. The vfd takes this and sets the speed based on the voltage provided. Dcm and for need to be connected for the spindle to turn on.

Vd002 is set to 1, vd070 is currently set at 1. I did try using frontal controls and had no issue when using the start/stop button on the vfd.

The main change is the board I'm using, the shapoko board wasn't suitable for this build.

The vfd is earthed, so is the spindle and the arduino board.