On Monday, January 16, 2012 11:00:35 PM Jon Elson did opine: > gene heskett wrote: > > That was when I learned about EDM to remove the taps. :) Slow, but > > does the job without hurting the hole. I have since built a better > > PSU for that, works nicely but you can hear it running blocks away, > > very _VERY_ noisy, estimated 140db inside the teeny shop I have. > > I got to see Ben Fleming's pulser EDM at the CNC Workshop last June (?) > in Ann Arbor. > it made amazing progress in steel, much faster than RC EDMs. I think it > could probably > remove a small tap in 15-30 minutes, and made just a little sizzling > noise, like cooking > bacon. Nowhere near 140 dB! He has a book and a blank board, I am > working on > making one. > > Jon
In fairness, and to uphold my geek cred, I'll have to admit that a 10uf cap, a 25 ohm 200 watts resistor and 80 volts is a wee bit much. 80 volts, maybe, but the cap needs to drop to maybe half a mic, which would raise the discharge frequency far enough we'd deafen dogs & cats half a block away. I'd say that it would still be hard on ears though. At 77, there is one store here in town that still has an ultrasonic burglar alarm. They run at 44 kilohertz and flood the room with about 5 watts of power. I may be the only person alive who has asked them to please turn it completely off during the business day. My eardrums get a tight feeling and I get a headache in just a couple of minutes in there. But this current rig can bore a 1/4" hole thru the web of a $40 table saw blade in about 3 minutes/hole once the tape ring dam was set & filled with K1. Nice clean hole too. I was mounting it on my rotary table so I could resharpen the saw blade. I guess it was one of those things I did just to keep me out of the bars. ;-) > > ------------------------------------------------------------------------ > ------ Keep Your Developer Skills Current with LearnDevNow! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users 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> I object to intellect without discipline; I object to power without constructive purpose. -- Spock, "The Squire of Gothos", stardate 2124.5 ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
