On Friday 15 February 2013 09:29:23 andy pugh did opine: > On 15 February 2013 10:08, Erik Christiansen <[email protected]> wrote: > > The thing is that even a hefty little NEMA23 stepper can come with a > > radial thrust limit of 15 N, and an axial limit even lower. (I've just > > bought one from a local CNC goodies supplier.) There's no way the > > toothed belt pulley could be directly mounted on the motor shaft, and > > the belt then tensioned to the "twang level" recommended on this list, > > for acceptable backlash on the belt drive portion, is there? > > Recommended where? > I have a number of axes without even any tensioner on the belts (just > holes bored at the exact centres) and they seem to work OK. Even the > ones with tensioners are not "twang" tight. > > There are belt designs with reduced backlash, and even zero backlash. > http://www.contitech.de/pages/produkte/antriebsriemen/antrieb-industrie/ > download/td_synchroflex_en.pdf Page 23. > Suggested pre-tension is on page 26, and appears to be approx half of > the drive-tension.
Wow, Thanks Andy. I've not seen such a collection of engineering data in one pdf before. Maybe I don't get around enough? 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) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Double your drive space: Delete Windows! I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
