This time I rotated the wood 90 degrees and did the same test again (roughing and finishing for both "conventional" and "climb" ).
This time: CV ( conventional ): x width = 19.93mm y width = 19.99mm
CB ( climb ): x width = 20.00mm y width = 20.00mm
So, the grain direction makes a difference. I feel ready for machining the Delrin that I am waiting for.
I have attached some videos to show the difference bewteen roughing and finishing. I guess the noise is indicative of inaccuracy.