On 15.02.13 11:57, andy pugh wrote: > On 15 February 2013 11:41, Erik Christiansen <[email protected]> wrote: > > > Thanks. That looks interesting. If I could go straight off the stepper > > shaft, it'd save a bit of work, and the couplings. But the tiny radial > > thrust rating on the stepper seems to kill that. > > 200N seems typical, and isn't _that_ tiny.
OK, it is only 75N for the one I bought: http://oceancontrols.com.au/MOT-128.html (It is axial thrust rating which is 15N.) > "Torque force" on a 3Nm stepper with a 20mm dia pulley is 300N. 150N > pre-tension sounds about right from the Conti manual. I only want to use it on a hobbing and dividing gadget, so might get away with belt drive within the 75N limit, but only if I only ever use half of its torque, given your figures. No, that would use up the whole allowance in the torque force! I can pretension to 37N, and use 1/4 of the motor torque, IIUC. I do seem to be looking down the barrel of a lay shaft and shaft coupler, ISTM. Perhaps it's grumpiness which causes me to refer to inadequate as "tiny". Erik -- We all have to reinvent the wheel, and the axle and the transmission and the engine, many times over. Its called learning. - Bill Colburn ------------------------------------------------------------------------------ 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
