How to find the error of my CNC

[MikeyC38]

Hi feldah
I'm not quite sure what you mean by your question but what I did was to draw and cut a number of simple shapes (e.g. Square and Circle) of around 100mm and then check with a pair of accurate digital calipers what the final object size was compared to the drawings. At the end of the day, it is the cut accuracy which is the most important. BTW on my machine it was 0.01mm which is good enough for my uses..

[paulus.v]

Here I wrote a few things about alignment. Maybe it helps.