Ok, finally catching a little time to answer back, sorry for the delay

EddyCurrent: Yes, you are totally right, I mistaked on the offset measure by dividing the height in two, regarding 22.5° angle was half of 45°. Fool me! I was very enthusiastic about the result, but even by fixing this, the final measures are still wrong...

I went through many tries and ran out of 0.375" thick material.... so I've been going with 0.35" thick instead. Same thing here: tan 22.5 * 0.35=0.1449"

So I drew a rectangle the size I need in the end (1.7677" x 2") and a smaller one inside, offset by 0.1449" on each side so 1.4778" x 1.71". Gave the inside rectangle the 22.5° angle slope and ended up with 1.734" x 1.97". A 0.03 difference on x and on y....

Odd enough, with the v-cutter, the tool path in CamBam shows the tool to be going right on the 1.767"x2" lines, but on the table, the difference is present. My v-cutter is pointy at the end, it has no flat end.

I zero my Z axis on the wasteboard itself, and after machining, I see no trace left on the wasteboard from the bit. It could've been a case of unproperly setting my Z axis, but it doesn't seem to be so.

I did checked for any loose screws on my cnc, and everything seems to be just tight. I also cut the rectangles with an end mill and the result is near perfect.

The difference is pretty much the same again, weather I use the ball nose or the v-cutter, so I'm fairly confused to where is my mistake here.

I am adding the .cb file of both ball nose and v-cutter paths.

Thanks again!

Samuel