I just completed the machining of my 1st Ultem attempt. Simple 3-piece design with Jowo #6 nib unit. I am looking for suggestions for how to address the internal machining/drilling marks. I should have cleaned the ink completely from the pen (have been using it) but the pics still show the issue. External was finished to 320 with a slight buff after.
A) internal polishing? Sandpaper, Wooden Q-Tip, etc... improved it a bit but what is a more successful technique?
B) media tumbling? Some of the commercial Ultem pens (Kasama, Schon) have a tumbled finish which appears to address this issue along with creating an overall matte finish. Plastic media? Tumble duration?
I am using a manual Sherline lathe and carbide drills so both equipment and technique could be complicating things.
A) internal polishing? Sandpaper, Wooden Q-Tip, etc... improved it a bit but what is a more successful technique?
B) media tumbling? Some of the commercial Ultem pens (Kasama, Schon) have a tumbled finish which appears to address this issue along with creating an overall matte finish. Plastic media? Tumble duration?
I am using a manual Sherline lathe and carbide drills so both equipment and technique could be complicating things.