Originally Posted by
alexccmeister
Hi all,
.....Anyway, after cutting the surface of the aluminium plate has a set of parallel ridges to it along the line of the cut. I can feel the ridges with my finger. This patterns repeat itself over the whole surface. I am guessing either of the two is the problem but I can't be sure.
1. The Z column is not 90 degrees to the table. ...
You did answer your own question, almost. it is actually the axis of rotation of the spindle that is not perpendicular to the plane of travel of the X and Y axes.
If you can feel the ridges from a 16mm end mill the spindle is rather badly out of true.
An open mind is a virtue...so long as all the common sense has not leaked out.