On Thursday 10 December 2009, Pat Lyons wrote: >If a brake is being used, what about a direct drive setup? > >-pat
I hadn't given that any real thought. This one has a brass thumbscrew with IMO very limited holding power. Some sort of an eccentric to pull the table down and lock it against its base would do a much better job IMO. Or just replace it with a real table, heck, this one doesn't even have a #2 taper center socket. You really do get what you pay for. :) >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-ga >>la >> >> >_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 > -- 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> Ignorance is when you don't know anything and somebody finds it out. ------------------------------------------------------------------------------ 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
