Barrel Lid Help

[eflyguy]

1.5” wood bourbon barrel head

Hey GF community, hope all is well! Got my GFPro 3 days ago and have already hit the ground running with custom ornaments etc. Reaching out because I’m having an issue engraving 1.5” white oak bourbon barrel heads with the laser. No crumb tray, but for some reason machine says material is too thick after the camera tries to read it and sometimes hits the barrel. I know it may be a simple fix, but what settings do I need? (Sounds like a distance from material issue) (Is it crumb tray height…