On Wednesday, February 22, 2012 03:47:20 PM gene heskett did opine: > Greetings all; > > The new encoder wheel I made last night, by fiddling with the math that > determines the slot width until it has virtually no side wobble of the > 1/16" mill at the inner apex of the slot, makes me ask a question about > what is the best way to chemically blacken brass, hopefully with the > intention of preventing reflections from the sides of the cut in the > brass that might artificially broaden the effective aperture of the > slot. > > So, how does one chemically blacken brass? > > Ideally something that destroys any and all surface gloss, leaving a > dead flat microscopic felt like finish. > > I considered paint, but at those angles of reflectance, even black paint > might as well be glossy white. Plus I don't have any other than some > ebony wood stain. ;-) > > Cheers, Gene
The problem can I believe, be seen in the attached .jpg. And yes, now that the software problems in cutting it incrementally have been addressed, a 4th disk will be cut that is hopefully more consistently cut. My sacrifical HDPE caused this one to warp about 10 thou, so I will make another using a wooden sacrifice pad, and cut about 5 thou deeper to get all the way through with out having to peck some of those slots out with my pocket knife. 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> HOST SYSTEM NOT RESPONDING, PROBABLY DOWN. DO YOU WANT TO WAIT? (Y/N)
<<attachment: 3rd.disk.jpg>>
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