On Thu, 2009-12-10 at 09:23 -0500, Rainer Schmidt wrote: > Gears have backlash period. And if they don;t have backlash out of the > box... they increasingly will have it. > There's a method of countering that, but it increases wear as it uses tension. > I rely on my steel loaded timing belts instead. I use the type made for the > car > industry. Incredibly strong PU with little steel cables in them. Even > exceeding the suggested load max by a factor ten to achieve a guitar > string like tension has not resulted in any failures yet. I cannot > measure any flex at 160lbs of tension and the speed they can achieve > is incredible. Less than 3 bucks per foot is also cheap. Many belts > run in Diesel engines as valve timing belts for more than 50,000 miles > before they are changed just for good measure. That's a lot of > rpm's... and heat... They last forever in our environment. > R
I like the idea of using an automotive timing belt. I use an inch wide on the Y and W axes of my little mill. I would also consider direct coupling a 2500 ppr encoder to the main shaft. With quadrature you get about 2 minutes of resolution; probably better than most tables. ;-) Maybe use a disk brake to hold for really tough cutting. Some year I may get around to implementing something like this. Good luck. HTH Dave > > ------------------------------------------------------------------------------ > 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
