On 11 Jun 2014, at 19:00, Todd Zuercher <zuerc...@embarqmail.com> wrote:
> Any one have any ingenious ideas for a good way to drive two parallel ball > screws that are 12 feet appart (gantry router), with only 1 motor (instead of > 2) ? Hi Todd, could you elaborate a little bit on the actual setup? Do you want to rotate the nut on the gantry, or do you want to rotate the spindles on the frame beneath? Either way, if you want to use 1 motor, then position it in the middle so elasticity (I roughly calculate 3 feet in 1 meter) over the 4 meters is equal on both sides. Otherwise you will have one of the nuts/spindles lagging w.r.t. the other one. What is the torque you expect? and the tolerance you expect to mill? What kind of finish (part/component quality) are you after? - 2 90 degree gearboxes with a shrink collar could be used. with a gearbox in the middle. - Another way could be to put bevel gears on the end of the spindle and drive that with 1 axis (again, motor in the middle). - or you could use an eccentric plate construction. A motor with an eccenter who drives 1 plate. That plate is held in place by 3 executers. Then you put an executer on both spindels/nuts and when the eccentric plate starts to move the spindle/nut will be rotated. You’ll have a bad time fighting vibrations :) you’ll need to counterbalance it so I guess it gets a little bulky. To get the idea: something like this, http://www.google.com/patents/US2342251 or http://www.google.pl/patents/US4260301 > > -- > > ======================================== > > Todd Zuercher > mailto:zuerc...@embarqmail.com > > ======================================== > ------------------------------------------------------------------------------ > HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions > Find What Matters Most in Your Big Data with HPCC Systems > Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. > Leverages Graph Analysis for Fast Processing & Easy Data Exploration > http://p.sf.net/sfu/hpccsystems > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing & Easy Data Exploration http://p.sf.net/sfu/hpccsystems _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
