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. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ 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
