Thickness
Bob,
Designer needs to know the board thickness in order to be able to show cut-through if you set the depth too deep, do a double-sided carve that carves through the board, and to warn you if you attempt something that might cause problems.
Boards with carvings on both sides require you to tell the machine where to touch the surface. There are two ways to do that, both are described in various threads.
HTH
Ken,
V-1, 2, & 3
When the People fear their Government, there is Tyranny.
When the Government fears the People, there is Liberty.
- Thomas Jefferson
You must be the change you wish to see in the world.
- Mohandas Gandhi