On Tuesday, February 07, 2012 11:49:13 PM Jon Elson did opine: > gene heskett wrote: > > I would think I can probably do that here Jon, since pcb-gcode uses > > the engraving bit to spot a starter dimple for the following drill > > operations. When I was off a couple thou, I've seen a #67 drill > > actually bend and use the marked spot a few times. At 18 thou, I > > expect I'd have to drop the Z feed rate from 6 ipm now though. My > > spindle is about 100k revs too slow. > > Well, due to my VFD only going to 400 Hz, I can't drill above 24,000 > RPM, but that > works fine. I can't remember what feed I used, but it doesn't take very > long to poke > through a .062" board, even at slow feeds. > > Jon
Now you're making me jealous, that is 10x what I can do. That may get 'fixed' at some point, I'm noting there is about 30 degrees of slack between the spindle & the motor of late, so I expect I have some plastic gears with the center holes key slot about wobbled out. My 7x12 is suffering the same malady at two locations, so the X drive is about 30-45 degrees of slop when the chuck is reversed by hand. The lathe I can get all metal gears for, but the mill I would love to belt drive somehow, and drive the high gear about 3x what it can do now, effectively making a 3 speed out of it. I think the spindle can take 7-10k revs, at 2500 it doesn't heat at all other than what might telegraph down from the motor. And that's checking it after a 36 hour runtime. So I might have to pester Chris at LMS & see if anyone has made a belt drive conversion for the micromill yet. Or, heaven forbid, make it myself. :) 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> A man may be so much of everything that he is nothing of anything. -- Samuel Johnson ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
