On 1/9/2015 3:30 PM, andy pugh wrote: > On 9 January 2015 at 20:09, Eric H. Johnson <ejohn...@camalytics.com> wrote: >> I do not think I have that option, at least not without changing amplifiers. >> The only interface to the existing amplifiers is a -10 to 10V signal. This >> configuration with stepper motors is pretty much falling off a log easy. > It shouldn't be horribly hard with servos, as long as the motors are > in control at all times. > > The danger is runaway during the tuning phase. I think it might be > wise to set up something in HAL that kills the system if the two > encoders differ in value by more than a small amount.
I agree with Andy. Doing it with servos should not be hard if your gantry self squares. (IE, when power is off the gantry is adequately square). So then you enable the servos, the motors are both at 0 position and you can go from there. If your encoder feedback position differs between motors, shutdown the motors. If the drives are digital and you can tune them with the same exact tuning numbers this should not be too difficult. If you have analog drives, it might get "interesting" trying to match the drive tuning so you don't trip out on encoder differences (position deviation from side to side). Dave --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
