On Monday, February 27, 2012 09:30:37 AM Ian W. Wright did opine: > Gene, > > I've been considering cnc-ing my little 7 x 12 for a while > now but other things have had to take priority. However, I > can't see why you wouldn't just want to hang a little Nema > 17 motor direct onto the back of the cross slide screw. One > of the 60 oz/in motors advertised on Ebay for about $25 > driven by an 1/8 step driver like the little Pololu or > StepStick boards should give plenty of resolution and torque > - same for the leadscrew. I've used several of these motors > and they really have some grunt despite their small size. As > matter of interest, I recently knocked together a little 3d > printer - a Prusa Mendel - and one of its first jobs was to > make me several change wheels for my 7 x 12 to let me cut > the unusual threads I've been struggling with - like a 56 > t.p.i. for a microscope lens mount. Its only working with > plastic but its great to be able to print out things like > these gears in less than an hour for less than the cost of > postage if I had sent for one!! > > Best wishes, > > Ian > Ian, that is a right jolly idea! I had no clue this stuff could do work fine enough to make gears. I need to replace those in my 2 speed mill head, and I have them on hand from LMS right now. And it would be nice to be able to pick up 2x the revs for engraving. ANAICT the spindle itself runs dead cold at 2500, so I'd think those bearings could do 5 grand. But I don't want to contemplate the noise that might make, it sounds like an old hand cranked corn sheller now. :(
I have a bag of the KE56KM2-009 motors, little single stack nema 23 wannabe's rated at 52 oz, and running at 2 amps I think they will work very well indeed at least for the cross slide. And I have some 425's I can put on the lead screw too. So, warmer weather will find me in the driveway using my old 12" craftsman bandsaw to find the motor mount extension to attach to the rear of the carriage buried someplace in a bigger block of alu. I guess if I want a treadmill motor, I'll have to haunt the scrap yards and intercept one there. All the surplus new ones seem to be going into home brew wind generators at 3x the price. Bummer. 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> She cried, and the judge wiped her tears with my checkbook. -- Tommy Manville ------------------------------------------------------------------------------ Try before you buy = See our experts in action! 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-dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
