On 15 December 2012 21:23, Ben Potter <[email protected]> wrote: > I've got a machine with much the same limit (1200 line) - which is somewhat > frustrating at times. I couldn't figure out a way to (easily and cheaply) > convert it over to linuxcnc without replacing the existing drives and > resolvers
I have a Mesa 7i49 (I bought it with actual money) and it works brilliantly. I am running a set of 3 Lenze servos with a combination of the 7i49, the LinuxCNC "bldc" component and Mesa 8i20 drives. The 7i49 has 6 resolver inputs and 6 analogue (+10v to -10V) outputs. I am not using the outputs, which offends my sensibilities slightly. I might add a bunch of analogue voltmeters to indicate "stuff" just to find a use for them. Pico have an alternative board that converts Resolvers into quadrature pulses. I made an Arduino-based variant on the theme. http://wiki.linuxcnc.org/cgi-bin/wiki.pl?ResolverToQuadratureConverter You will note that I bought a 7i49. I am fairly sure that I don't actually need the "bldc" component in my setup. All it is doing is putting in a phase difference between the resolver and the drive. I suspect that I could get the same effect by swapping the motor wires and/or the resolver wires. The 7i49 provides rotor position straight to HAL with 24 bits of precision. (and about 16 bits of accuracy) -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
