First Proper CNC Router

[diycnc]

I appreciate the concerns about the measurement method.
Did some more measurements today to check the repeatability and accuracy of the method.
I deliberately rotated by plywood platform 180 degrees, and positioned the surface plate differently to really test the approach, and pretty surprised to the 1st and 2nd measurements vary by only a max of 0.1mm, that more than good enough for me.
I also used the same method to measure the polished edge of a piece of granite upstand, its the straightest thing I have to hand. I got less than 0.1mm deviation along its 500mm length. Again I'm happy with this.

All in all im very happy with the measurements, and im confident they are accurate enough for me.



X and Y axis are 750mm.
Intended for wood and plastic, and hopefully aluminium. I know ill have to take it easy with aluminium, and I'm not expecting it hog out anything more than the smallest of cuts, or the highest of surface finish quality.

Going back to shims, my concern is will there be a noticeable lack of stiffness with the rails supported on just a handful of points?