vCarve corners not square

[Julien]

So over time we have had a number of threads with similar conversations, here’s the one I think was the most throrough, and it pretty much boils down to that post from @neilferreri

V-Carve Corner Issue

Mine too. (Ignore the fact that I was the guy that said otherwise) I had it in my head that I was making 50mm squares, when, in fact, I was making 2" squares. #justUseMetric #ALLTheTime So, my final tests and I’m calling it solved. Three runs with the exact same gcode. Test 1: Just run the gcode Corners look overcut, but, in reality, the rest of the square is undercut (as @rekluse stated). [1] Test 2: Run the gcode twice. Much better…when measured, corners are just a hair overcut. [2] …

It might be deflection in your case too (and it would make sense that the tool deflects more in solid wood that in MDF). To confirm, measure the corner-to-corner distance and the middle-of-the-left-side-to-middle-of-the-right-side, chances are the corner to corner distance is as programmed, but the side to side is smaller than expected. Which would prove that the square part was undercut (except in corners). And to prove that theory, run the vcarve a second time. If you end up with a good square, this is it. The cut might need a “roughing + finishing strategy”, with the roughing pass being made slightly shallower than the final cut depth. Also make sure your vbit is still sharp.