I forgot to skim the face of the 1.5" SAE adaptor, and so decided to re-jig it and take a 0.1mm skim off the top to give a better surface finish. You can see in the video below I held the piece in an MDF negative jig, which is anything but ideal! but with such a light cut and 24,000 rpm spindle it did the job pretty well.
Word of warning: Turn your sound down before playing the video!!
