On Mon, 4 Jun 2012 06:39:50 -0400 gene heskett <ghesk...@wdtv.com> wrote:
> On Monday, June 04, 2012 06:31:34 AM Mark Wendt did opine: > > > On 06/03/2012 11:39 AM, gene heskett wrote: > > > > <snippage> > > > > > As for the various methods of blackening brass, discussed here > > > previously, most were butt ugly, giving all the colors of a good > > > skin bruise rather than a nice flat black. I believe that was > > > because of my inability to get all the cutting oil washed back > > > out of the brass with clean acetone or boiling in dish soap. I > > > can't go enough narrower to fix it with a 1/32" mill as I can't > > > trim the slot width more than another thou, so today I will try > > > dimming the leds. There has to be a fix someplace, I just have > > > to find it... > > > > > > > > > Cheers, Gene > > > > Gene, > > > > Acetone is a lousy degreaser. > > I didn't know that. > > It cuts most anything else, so I figured it was good for oils too. > > > Scrub with Dawn dish detergent and hot > > water, the follow that with a rubdown of denatured alcohol and a > > clean, oil free rag. Coffee filters or paper towels work good for > > that. Indeed, Dawn works well; so does TSP ( tri-sodium phosphate ) often a component in dishwasher soaps. Rinse well with water, distilled if you are picky. Dry in oven. Or use alcohol, methanol or denatured ethanol. Everclear is way too expensive to use that way ( I'm tight ). Surprisingly enough the nuclear people use acetone and then compressed air to prep threaded holes for locktite. HTH Dave > > I used some sort of dish detergent, probably liquid Palmolive, > whatever was on the sink at the time. For the alky I use the paint > thinner, real stuff, no water in it like is in isopropol. > > > That's all I do when I turn nickel silver fly rod ferrules, and I > > use cutting oil when turning them. I black/blue them without any > > trouble after that type of cleaning. Make sure you don't touch the > > brass with your bare hands after cleaning/degreasing, because skin > > oils will cause problems too. > > Well known. White cotton gloves that get tossed in the washing > machine frequently, then kept in a quart ziploc bag till used. > > > Mark > > Cheers, Gene ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
