On 6/11/2014 11:10 AM, andy pugh wrote: > On 11 June 2014 18:00, 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) ? > > Chains or belts? > > Give that a 24' belt might have a lot of stretch, it might be possible > to run a large-diameter thin-wall steel tube diagonally under the > table, and use two shorter belts to couple opposite ends of the two > screws to the tube. It might be possible to twist the belts enough to > make it work, or some sort of low-backlash flex-coupling might be > needed (a diaphragm coupling, for example)
Put a sprocket on both ends of each ballscrew. On one end of the table put a double row idler sprocket in the center and at the other end mount the same type of sprocket to the motor. That way the each chain only has to reach 6 feet and both ends stay synchronized. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.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
