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
