A couple of nice cnc machining parts images I discovered:
Aluminum Finish Cap prior to anodizing
Image by courtney johnston
Anodizing components for the TC18 VFD Tube Clock www.vonnieda.org/tc18
Bubbles in the acid around the cathode base
Image by courtney johnston
Anodizing components for the TC18 VFD Tube Clock www.vonnieda.org/tc18