On Wednesday, February 22, 2012 09:14:52 PM R.L. Wurdack did opine: > Whatever you use, beware of reflections from the sides of the slots > themselves.
Precisely my concern. The front & rear faces of the disk are basically a never mind. Its the walls of the slots I am concerned with. > i.e. The surface of the disk may not be the only reflection > problem. Will lampblack with a coat of clear flat Krylon work, or just > flat black Krylon.? Lampblack would be fine IF one could find a binder as effective as the krylon that wasn't glossy at low incident angles. A case where thin is good, but I expect trying to mill the outside 1/3" of it down to the point where knife edge diffraction was the major effect, would be pretty frustrating. Hence the search for something that would leave a truly non- glossy surface. I, after thinking about it, may just clean it up with Tarnex to dull & degrease the surface, and after much rinsing, try the vinegar dip and ammonia fumes route. After adjusting a few more params in the gcode, just made another, considerably neater cut one I am quite a bit happier with, if I can get it suitable blackened inside the slots. Low res .jpg attached Actually Dick, this is a case where a roughing bit might have been an advantage. :-) But I don't know as I've ever seen a 1/16" diameter rougher. That doesn't mean they don't exist, just that I never thought of it till a couple minutes ago. Hindsight, always 20/05 or better you know. :) Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Max told his friend that he'd just as soon not go hiking in the hills. Said he, "I'm an anti-climb Max." [So is that punchline.]
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