Help needed, new to cnc and having cut depth issues

[dazp1976]

Hi all, I am new to CNC and the forum. I have recently built an Ooznest workbee CNC 1500 x 1500 and I've fitted a spoiler board and when I have come to surface it, i have run into the issue of the router coming down but not enough to reach/cut the spoilerboard. I am on Vcarve pro and I have set the cut depth to 0.3 mm and the start depth to 0 mm.

Thanks.

You say 0.3. Don't you mean - 0.3 (negative)? As in below zero.