If a brake is being used, what about a direct drive setup? -pat
On Thu, Dec 10, 2009 at 7:08 AM, Gene Heskett <[email protected]>wrote: > On Thursday 10 December 2009, Pat Lyons wrote: > >Hey guys, > > > >I'm going to add a 4th axis to my gettup here on my lagun emc refit, and > >wanted to ask for suggestions. > > > >My plan is (as of now) to find a rotary table on the cheap (ebay, > > craigslist etc) and mill up a motor mount to it with encoder feedback, > and > > use the 4th channel on my 5i20. > > > >I've never even used a manual rot table, so if you guys would be so kind > as > >to make me aware of what I'm totally overlooking here, that would be very > >much appreciated. > > > >I plan on finding a table that can sit perpendicular to the table, like in > >this video: > > > > > http://www.dailymotion.com/video/x9a6s1_cnc-turning-on-4axis-mill-with-gala > >_tech > > > >i would also plan on running a lathe-like chuck too... > > > >any comments/suggestions/do's&donts??? > > > >Thanks a ton! > >-Pat > > 1. Most tables can be mounted that way, or face up so you get a twofer > automatically. > > 2. For that video's sort of work, backlash won't be a huge problem. > > 3. face up & making a sprocket, or lathe style & carving gears, backlash > will > be a problem. So it may be wise to add a 2nd lock brake so that the table > is > locked pretty solidly when the motor is not moving it. I'm still figuring > out how to do that with mine as it has a thumb screw with limited holding > power. > > <http://gene.homelinux.net:85/gene/emc/A-drv.jpg> > shows the motor mount I made for a cheap 4" Grizzly table. > > The coupling inside it is a heavy steel rig, two cups facing each other, > with > 1/4" slots cut across, with a steel disk trapped in the middle which has a > 1/4" wide fin, laying 0-180 on one face, and 90-270 on the other so it > presents a sliding u-joint with very little backlash that can absorb the > axles being out of line a couple thou. > > -- > 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) > The NRA is offering FREE Associate memberships to anyone who wants them. > <https://www.nrahq.org/nrabonus/accept-membership.asp> > > Fast ship? You mean you've never heard of the Millennium Falcon? > -- Han Solo > > > ------------------------------------------------------------------------------ > Return on Information: > Google Enterprise Search pays you back > Get the facts. > http://p.sf.net/sfu/google-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Return on Information: Google Enterprise Search pays you back Get the facts. http://p.sf.net/sfu/google-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
