I did my grid line design in VCarve using a 60deg V-bit and a cut depth of 0.035". Here’s what it looks like.
To make the design I drew a single horizontal and vertical line that was 32" long and then used the array copy to replicate each of them across the board at 1in spacing. I didn’t go all the way to 32.25" because the resulting g-code file exceeded the limits of the machine because VCarve Pro wanted to move the cutter somewhat past 32.25" while re-positioning and I didn’t want to spend the time trying to figure out how to prevent it from doing that.
Martin