On 11/01/2013 08:22 AM, dave wrote: > Hi all, > > I've often wondered how well a rotary table would work if driven by a > reasonably stiff timing belt. Say 1" urethane with steel fibers. > Gearing would be approx 5:1 and then a reducer if necessary to couple to > the servo motor. Encoder would be mounted on an idler wheel driven by > the 1" belt. I use a similar encoder setup on the Z axis of my mill and > it seems to give rather good control at ~ 100K counts/inch. ;-) > > Has anyone tried this or something similar and what were the results. > Stiff enough? Accurate enough? Of course everyone's definition of > adequate is different but was it good enough to be usable? > > Many thanks in advance. > > Dave
I haven't tried it, but this belt arrangement comes to mind: http://www.rockcliffcnc.com/SiteImages/CNC%20ROUTER%20BELT%20DRIVE%20ROCKCLIFF.jpg The picture above is similar to the mechanism I'm thinking of, which uses a rack with the form of the belt and the span between the pinion and the idler wheels is closed until they touch, or nearly so. The amount of belt involved is between where each idler touches the rack (with the belt in between) and where it touches the pinion. There should be very little flex. This should work as well with a pulley replacing the rack. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
