Dave, I believe the encoders are already installed on the rear shaft of the AC Servo's and his Arrow 500 is designed to be direct drive. No gears, no belts. The torque and speed of the Servo's are selected to be matched for 1 to 1 direct drive.
Thanks, Billy On 02/14/2013 12:37 PM, dave wrote: > On Thu, 2013-02-14 at 12:08 -0500, Pete Matos wrote: >> Billy, >> I am fairly familiar with the oldham style couplers and they have some >> advantages but I was under the impression they are less than great in the >> backlash area. I want this machine to be able to transmit the full power >> of these motors to the screws and do it without any backlash at >> all....zero... There is enough backlash in any ballscrew assembly with the >> thrust bearings and the ballnuts etc. I don't need to be adding to it here. >> So far those disk type ones seem to offer some misalignment and offset >> protection yet still allow zero backlash and the ones in the sizes I need >> are stainless steel it seems. Dunno how much those cost but I am sure it >> is not cheap. Peace >> >> Pete >> > <massive snip> > > Pete, > You have me totally confused. My assumption was that you were speaking > of couplers to an encoder not to a ballscrew. Sorry if I'm so slow. > > What does the original machine use for coupling and can you clone it? > > Most machines I'm familiar with use either timing belts for relatively > low power and gears for high power. > > I suppose your other option is to use a less than perfect (in terms of > backlash) coupler for driving the ballscrews and then mount the encoders > on the non-driven end of the ballscrew. I've taken that approach on my > machines and it works reasonably well. That is it tunes better than > putting the encoder on the end of the motor. YMMV. > > Sounds like a good project. I assume you have reviewed the stuff on the > wiki about the conversion of a Mazak V5 at fest. (Galesburg). > > Dave > > > ------------------------------------------------------------------------------ > 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 -- Billy Huddleston Inner Vision *William Huddleston Inner Vision Development Corp* Office: 865.560.2752 Fax: 865.560.2703 http://www.ivdc.com *Development and Consulting... Simplified.* <http://www.facebook.com/pages/Inner-Vision-Development/120023721424> <http://twitter.com/ivdc> <http://www.linkedin.com/in/ivdccorp> ------------------------------------------------------------------------------ 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
