There may be more elaborate versions but here is my ghetto 4th... http://www.machsupport.com/forum/index.php/topic,11044.0.htm It has no backlash. Those turntables are all garbage for cnc because of the backlash. Specially that Phase II China Junk. It all looks good and costs less but once you try and make something good with it you wonder why you fail and fail and fail. I started of with ENCO stuff and other imports and after knowing what I am doing pretty much ebay'd it of again.
I used a McMasters Shaft with ready made 1inch 8tpi threading on the end to mount the chuck with that threading and I used a nut that size for the pulley. Then there are timkin thrust bearings. Nothing special, plain brute force. The shaft is solid 1,5 inches. Recently I turned a 350lbs log with that and the corresponding 'light' tailstock. Not an issue.... It will eat a Phase 2 4th axis for breakfast. I'd cover it better from the elements if coolant should soak it. Which is not complicated... The thread allows me to use a variety of chucks I own. Best of luck Rainer with the Ghetto 4th 8))))))) On Sun, May 24, 2009 at 7:14 PM, Kirk Wallace <[email protected]> wrote: > I need to start to think about making or getting a rotary axis. The > first thing that comes to mind is to adapt a servo and encoder to one of > these: > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260343949073 > > What other options should I consider, maybe start from scratch, if so > what type of drive? > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA > > > ------------------------------------------------------------------------------ > Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT > is a gathering of tech-side developers & brand creativity professionals. Meet > the minds behind Google Creative Lab, Visual Complexity, Processing, & > iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian > Group, R/GA, & Big Spaceship. http://www.creativitycat.com > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- _________________________________ Rainer M. Schmidt Complex Consulting LLC [email protected] VoIP (646)-233-1002 FAX (646)-435-9216 ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://www.creativitycat.com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
