edge finish - ripples and ridges

[JAZZCNC]

The ripples are very bad chatter from cutting deep or a weak machine flexing. These often happens when roughing out and why you should always have a finish pass if it matters.

The ridge will be caused by the cutter springing with the difference between deep and shallow cut. Chances are the cutter used didn't have enough flute length to cut 15mm so did pass in 2 but mistake being they used deep pass followed by shallow instead of breaking in half to relieve spring on cutter.
A finish pass with a small 0.1mm or so step over to clean up would have sorted this and left nice finish, even with short flute length cutter has there is very little pressure on cutter so no spring on cutter.

Usually if you run over flat belt sander the ripples are knocked off easy enough.