You shouldn't have any problems with reflections from the sides of the slot as they should be equally blackened. I used to work in the optical industry where we used the liver of sulfur treatment for brass telescope parts and all the interior surfaces blackened nicely.
>________________________________ > From: gene heskett <ghesk...@wdtv.com> >To: emc-users@lists.sourceforge.net >Sent: Wednesday, February 22, 2012 8:35 PM >Subject: Re: [Emc-users] Brass finish question? > >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.] > >------------------------------------------------------------------------------ >Virtualization & Cloud Management Using Capacity Planning >Cloud computing makes use of virtualization - but cloud computing >also focuses on allowing computing to be delivered as a service. >http://www.accelacomm.com/jaw/sfnl/114/51521223/ >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
